Date: 31 January 2007
Click here for printable version
Click here for PGP verifiable version
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
===========================================================================
A U S C E R T A L E R T
AL-2007.0012 -- AUSCERT ALERT
[Cisco]
Crafted TCP Packet Can Cause Denial of Service
31 January 2007
===========================================================================
AusCERT Alert Summary
---------------------
Product: IOS TCP Listener
Publisher: Cisco Systems
Operating System: Cisco IOS
Impact: Denial of Service
Access: Remote/Unauthenticated
Original Bulletin:
http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-tcp.shtml
Revision History: January 31 2007: Workaround for BGP with MD5
authentication added
January 25 2007: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Security Advisory: Crafted TCP Packet Can Cause Denial of
Service
Advisory ID: cisco-sa-20070124-crafted-tcp
http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-tcp.shtml
Revision: 1.1
Last Updated 2007 January 30 2230 UTC
For Public Release 2007 January 24 1600 UTC (GMT)
- ---------------------------------------------------------------------
Summary
=======
The Cisco IOS Transmission Control Protocol (TCP) listener in certain
versions of Cisco IOS software is vulnerable to a
remotely-exploitable memory leak that may lead to a denial of service
condition.
This vulnerability only applies to traffic destined to the Cisco IOS
device. Traffic transiting the Cisco IOS device will not trigger this
vulnerability.
Cisco has made free software available to address this vulnerability
for affected customers.
This issue is documented as Cisco bug ID CSCek37177.
There are workarounds available to mitigate the effects of the
vulnerability.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-tcp.shtml
Affected Products
=================
Vulnerable Products
+------------------
This issue affects all Cisco devices running Cisco IOS software. To
be affected, devices must be configured to process Internet Protocol
version 4 (IPv4) packets and receive TCP packets. Devices which run
only Internet Protocol version 6 (IPv6) are not affected.
This vulnerability is present in all unfixed versions of Cisco IOS
software, including versions 9.x, 10.x, 11.x and 12.x.
To determine the software running on a Cisco product, log in to the
device and issue the "show version" command to display the system
banner. Cisco IOS software will identify itself as "Internetwork
Operating System Software" or simply "IOS". On the next line of
output, the image name will be displayed between parentheses,
followed by "Version" and the IOS release name. Other Cisco devices
will not have the "show version" command or will give different
output.
The following example identifies a Cisco product running Cisco IOS
release 12.2(14)S16 with an installed image name of C7200-IS-M:
Cisco Internetwork Operating System Software
IOS (tm) 7200 Software (C7200-IS-M), Version 12.2(14)S16, RELEASE SOFTWARE (fc1)
The release train label is "12.2".
The next example shows a product running IOS release 12.3(7)T12 with
an image name of C7200-IK9S-M:
Cisco IOS Software, 7200 Software (C7200-IK9S-M), Version 12.3(7)T12, RELEASE SOFTWARE (fc1)
Additional information about Cisco IOS Banners is available at:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_white_paper09186a008018305e.shtml#3
Products Confirmed Not Vulnerable
+--------------------------------
Cisco products that do not run IOS are unaffected by this
vulnerability.
Cisco IOS-XR is not affected.
No other Cisco products are currently known to be affected by this
vulnerability.
Details
=======
TCP is the transport layer protocol designed to provide
connection-oriented, reliable delivery of a data stream. To
accomplish this, TCP uses a mixture of flags to indicate state and
sequence numbers to identify the order in which the packets are to be
reassembled. TCP also provides a number, called an acknowledgement
number, that is used to indicate the sequence number of the next
packet expected. The full specification of the TCP protocol can be
found at http://www.ietf.org/rfc/rfc0793.txt
Cisco IOS devices that are configured to receive TCP packets are
exposed to this issue. This Advisory does not apply to traffic that
is transiting the device.
Certain crafted packets destined to an IPv4 address assigned to a
physical or virtual interface on a Cisco IOS device may cause the
device to leak a small amount of memory. Over time, such a memory
leak may lead to memory exhaustion and potentially degraded service.
Although this is an issue with TCP, it is not required to complete
the TCP 3-way handshake in order for the memory leak to be triggered.
Therefore, TCP packets with a spoofed source address may trigger the
leak.
The following document contains additional information on how to
identify if your router is suffering from a memory leak in Processor
memory:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_tech_note09186a00800a6f3a.shtml#tshoot2
Vulnerability Scoring Details
=============================
Cisco is providing scores for the vulnerabilities in this advisory
based on the Common Vulnerability Scoring System (CVSS). Cisco will
provide a base and temporal score. Customers can then compute
environmental scores to assist in determining the impact of the
vulnerability in individual networks.
Cisco PSIRT will set the bias in all cases to normal. Customers are
encouraged to apply the bias parameter when determining the
environmental impact of a particular vulnerability.
CVSS is a standards based scoring method that conveys vulnerability
severity and helps determine urgency and priority of response.
Cisco has provided an FAQ to answer additional questions regarding
CVSS at:
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html
Cisco has also provided a CVSS calculator to help compute the
environmental impact for individual networks:
http://intellishield.cisco.com/security/alertmanager/cvss
CSCek37177 - malformed tcp packets deplete processor memory
CVSS Base Score: 3.3
- - Access Vector: Remote
- - Access Complexity: Low
- - Authentication: Not Required
- - Confidentiality Impact: None
- - Integrity Impact: None
- - Availability Impact: Complete
- - Impact Bias: Normal
CVSS Temporal Score: 2.7
- - Exploitability: Functional
- - Remediation Level: Official Fix
- - Report Confidence: Confirmed
Impact
======
Successful exploitation of the vulnerability may result in a small
amount of processor memory to leak, which may lead to degraded
service. This issue will not resolve over time, and will require a
device reset to recover the leaked memory.
This vulnerability only applies to traffic destined to the Cisco IOS
device. Traffic transiting the device will not trigger this issue.
Software Version and Fixes
==========================
When considering software upgrades, also consult
http://www.cisco.com/go/psirt and any subsequent advisories to
determine exposure and a complete upgrade solution.
In all cases, customers should exercise caution to be certain the
devices to be upgraded contain sufficient memory and that current
hardware and software configurations will continue to be supported
properly by the new release. If the information is not clear, contact
the Cisco Technical Assistance Center ("TAC") or your contracted
maintenance provider for assistance.
Each row of the Cisco IOS software table (below) describes a release
train and the platforms or products for which it is intended. If a
given release train is vulnerable, then the earliest possible
releases that contain the fix (the "First Fixed Release") and the
anticipated date of availability for each are listed in the "Rebuild"
and "Maintenance" columns. A device running a release in the given
train that is earlier than the release in a specific column (less
than the First Fixed Release) is known to be vulnerable. The release
should be upgraded at least to the indicated release or a later
version (greater than or equal to the First Fixed Release label).
For more information on the terms "Rebuild" and "Maintenance,"
consult the following URL:
http://www.cisco.com/warp/public/620/1.html.
Note: There are three IOS security advisories and one field notice
being published on January 24, 2007. Each advisory lists only the
releases which fix the issue described in the advisory. A combined
software table is available at
http://www.cisco.com/warp/public/707/cisco-sa-20070124-bundle.shtml
and can be used to choose a software release which fixes all security
vulnerabilities published as of January 24, 2007. Links for the
advisories and field notice are listed here.
* http://www.cisco.com/warp/public/707/cisco-sa-20070124-IOS-IPv6.shtml
* http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-tcp.shtml
* http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-ip-option.shtml
* http://www.cisco.com/warp/public/770/fn62613.shtml
Requests for software rebuilds to include the change for Daylight
Savings Time (DST) that will be implemented in March 2007 should be
directed through the Technical Assistance Center (TAC), and this
advisory should be used as reference.
+------------------------------------------------------------------------+
| Major | Availability of Repaired Releases |
| Release | |
|------------+-----------------------------------------------------------|
| Affected | | |
| 12.0-Based | Rebuild | Maintenance |
| Release | | |
|------------+-----------------------------------------------------------|
| 12.0 | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0DA | Vulnerable; migrate to 12.2(10)DA5 or later |
|------------+-----------------------------------------------------------|
| 12.0DB | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.0DC | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| | 12.0(31)S6 | |
|12.0S |----------------------------+------------------------------|
| | 12.0(32)S4 | |
|------------+-----------------------------------------------------------|
| 12.0SC | Vulnerable; migrate to 12.3(13a)BC6 or later |
|------------+-----------------------------------------------------------|
| 12.0SL | Vulnerable; migrate to 12.0(31)S6 or later |
|------------+-----------------------------------------------------------|
| 12.0SP | Vulnerable; migrate to 12.0(31)S6 or later |
|------------+-----------------------------------------------------------|
| 12.0ST | Vulnerable; migrate to 12.0(31)S6 or later |
|------------+-----------------------------------------------------------|
| 12.0SX | 12.0(25)SX11 | |
|------------+----------------------------+------------------------------|
| 12.0SY | | 12.0(32)SY |
|------------+-----------------------------------------------------------|
| 12.0SZ | Vulnerable; migrate to 12.0(31)S6 or later |
|------------+-----------------------------------------------------------|
| 12.0T | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0W | Not vulnerable |
|------------+-----------------------------------------------------------|
| 12.0WC | 12.0(5)WC15 | |
|------------+-----------------------------------------------------------|
| 12.0WT | Not vulnerable |
|------------+-----------------------------------------------------------|
| 12.0XA | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0XB | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0XC | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0XD | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0XE | Vulnerable; migrate to 12.1(26)E7 or later |
|------------+-----------------------------------------------------------|
| 12.0XF | Not vulnerable |
|------------+-----------------------------------------------------------|
| 12.0XG | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0XH | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0XI | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0XJ | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0XK | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0XL | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0XM | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0XN | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0XQ | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0XR | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0XS | Vulnerable; migrate to 12.1(26)E7 or later |
|------------+-----------------------------------------------------------|
| 12.0XV | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.0XW | Not vulnerable |
|------------+-----------------------------------------------------------|
| Affected | | |
| 12.1-Based | Rebuild | Maintenance |
| Release | | |
|------------+-----------------------------------------------------------|
| 12.1 | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.1 AA | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.1 AX | Vulnerable; migrate to 12.2(25)EY4 or later |
|------------+-----------------------------------------------------------|
| 12.1 AY | Vulnerable; migrate to 12.1(22)EA8 or later |
|------------+-----------------------------------------------------------|
| 12.1 AZ | Vulnerable; migrate to 12.1(22)EA8 or later |
|------------+-----------------------------------------------------------|
| 12.1 CX | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.1 DA | Vulnerable; migrate to 12.2(10)DA5 or later |
|------------+-----------------------------------------------------------|
| 12.1 DB | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.1 DC | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| | 12.1(26)E7 | |
|12.1E |----------------------------+------------------------------|
| | 12.1(27b)E1 | |
|------------+----------------------------+------------------------------|
| 12.1EA | 12.1(22)EA8 | |
|------------+-----------------------------------------------------------|
| 12.1EB | Vulnerable; contact TAC |
|------------+-----------------------------------------------------------|
| 12.1EC | Vulnerable; migrate to 12.3(13a)BC6 or later |
|------------+-----------------------------------------------------------|
| | 12.1(19)EO6; available on | |
| 12.1EO | 31-Jan-07 | |
| |----------------------------+------------------------------|
| | 12.1(20)EO3 | |
|------------+-----------------------------------------------------------|
| 12.1EU | Vulnerable; migrate to 12.2(25)EWA6 or later |
|------------+-----------------------------------------------------------|
| 12.1EV | Vulnerable; migrate to 12.2(27)SV4 or later |
|------------+-----------------------------------------------------------|
| 12.1EW | Vulnerable; migrate to 12.2(25)EWA6 or later |
|------------+-----------------------------------------------------------|
| 12.1EX | Vulnerable; migrate to 12.1(26)E7 or later |
|------------+-----------------------------------------------------------|
| 12.1EY | Vulnerable; migrate to 12.1(26)E7 or later |
|------------+-----------------------------------------------------------|
| 12.1EZ | Vulnerable; migrate to 12.1(26)E7 or later |
|------------+-----------------------------------------------------------|
| 12.1T | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.1XA | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.1XB | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.1XC | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.1XD | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.1XE | Vulnerable; migrate to 12.1(26)E7 or later |
|------------+-----------------------------------------------------------|
| 12.1XF | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1XG | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1XH | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.1XI | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.1XJ | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1XL | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1XM | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1XP | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1XQ | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1XR | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1XS | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.1XT | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1XU | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1XV | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1XW | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.1XX | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.1XY | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.1XZ | Vulnerable; migrate to 12.2(37) or later |
|------------+-----------------------------------------------------------|
| 12.1YA | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1YB | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1YC | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1YD | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1YE | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1YF | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1YH | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1YI | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.1YJ | Vulnerable; migrate to 12.1(22)EA8 or later |
|------------+-----------------------------------------------------------|
| Affected | | |
| 12.2-Based | Rebuild | Maintenance |
| Release | | |
|------------+----------------------------+------------------------------|
| 12.2 | | 12.2(37) |
|------------+-----------------------------------------------------------|
| 12.2B | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2BC | Vulnerable; migrate to 12.3(13a)BC6 or later |
|------------+-----------------------------------------------------------|
| 12.2BW | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2BY | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2BZ | Vulnerable; migrate to 12.3(7)XI8 or later |
|------------+-----------------------------------------------------------|
| 12.2CX | Vulnerable; migrate to 12.3(13a)BC6 or later |
|------------+-----------------------------------------------------------|
| 12.2CY | Vulnerable; migrate to 12.3(13a)BC6 or later |
|------------+-----------------------------------------------------------|
| 12.2CZ | Vulnerable; contact TAC |
|------------+-----------------------------------------------------------|
| | 12.2(10)DA5 | |
|12.2DA |----------------------------+------------------------------|
| | 12.2(12)DA10 | |
|------------+-----------------------------------------------------------|
| 12.2DD | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2DX | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2EU | Vulnerable; migrate to 12.2(25)EWA6 or later |
|------------+-----------------------------------------------------------|
| 12.2EW | Vulnerable; migrate to 12.2(25)EWA6 or later |
|------------+-----------------------------------------------------------|
| 12.2EWA | 12.2(25)EWA6 | |
|------------+----------------------------+------------------------------|
| 12.2EX | 12.2(25)EX1 | |
|------------+----------------------------+------------------------------|
| 12.2EY | 12.2(25)EY4 | |
|------------+-----------------------------------------------------------|
| 12.2EZ | Vulnerable; migrate to 12.2(25)SEE1 or later |
|------------+-----------------------------------------------------------|
| 12.2FX | Vulnerable; migrate to 12.2(25)SEE1 or later |
|------------+-----------------------------------------------------------|
| 12.2FY | Vulnerable; migrate to 12.2(25)SEE1 or later |
|------------+-----------------------------------------------------------|
| 12.2FZ | All 12.2FZ releases are fixed |
|------------+-----------------------------------------------------------|
| 12.2IXA | Vulnerable; migrate to 12.2(18)IXD; available 30-April-07 |
|------------+-----------------------------------------------------------|
| 12.2IXB | Vulnerable; migrate to 12.2(18)IXD; available 30-April-07 |
|------------+-----------------------------------------------------------|
| 12.2IXC | Vulnerable; migrate to 12.2(18)IXD; available 30-April-07 |
|------------+-----------------------------------------------------------|
| 12.2JA | Vulnerable; migrate to 12.3(8)JA2 or later |
|------------+-----------------------------------------------------------|
| 12.2JK | Vulnerable; migrate to 12.4(4)T4 or later |
|------------+-----------------------------------------------------------|
| 12.2MB | Vulnerable; migrate to 12.2(25)SW8 or later |
|------------+-----------------------------------------------------------|
| 12.2MC | Vulnerable; migrate to 12.3(11)T11 or later |
|------------+-----------------------------------------------------------|
| 12.2S | 12.2(25)S12; Available | |
| | 12-Feb-07 | |
|------------+----------------------------+------------------------------|
| 12.2SB | 12.2(28)SB2 | 12.2(31)SB |
|------------+----------------------------+------------------------------|
| 12.2SBC | 12.2(27)SBC5 | |
|------------+----------------------------+------------------------------|
| 12.2SE | | 12.2(35)SE |
|------------+-----------------------------------------------------------|
| 12.2SEA | Vulnerable; migrate to 12.2(25)SEE1 or later |
|------------+-----------------------------------------------------------|
| 12.2SEB | Vulnerable; migrate to 12.2(25)SEE1 or later |
|------------+-----------------------------------------------------------|
| 12.2SEC | Vulnerable; migrate to 12.2(25)SEE1 or later |
|------------+-----------------------------------------------------------|
| 12.2SED | Vulnerable; migrate to 12.2(25)SEE1 or later |
|------------+-----------------------------------------------------------|
| 12.2SEE | 12.2(25)SEE1 | |
|------------+----------------------------+------------------------------|
| 12.2SEF | 12.2(25)SEF1 | |
|------------+-----------------------------------------------------------|
| 12.2SEG | All 12.2SEG releases are fixed |
|------------+-----------------------------------------------------------|
| 12.2SG | | 12.2(37)SG; Available |
| | | 25-Apr-07 |
|------------+-----------------------------------------------------------|
| 12.2SGA | All 12.2SGA releases are fixed |
|------------+-----------------------------------------------------------|
| 12.2SO | 12.2(18)SO7 | |
|------------+-----------------------------------------------------------|
| 12.2SRA | All 12.2SRA releases are fixed |
|------------+-----------------------------------------------------------|
| 12.2SRB | All 12.2SRB releases are fixed |
|------------+-----------------------------------------------------------|
| 12.2SU | Vulnerable; migrate to 12.4(8) or later |
|------------+-----------------------------------------------------------|
| | 12.2(27)SV4 | |
| |----------------------------+------------------------------|
| 12.2SV | 12.2(28)SV1 | |
| |----------------------------+------------------------------|
| | 12.2(29)SV1 | |
|------------+----------------------------+------------------------------|
| 12.2SW | 12.2(25)SW8 | |
|------------+-----------------------------------------------------------|
| 12.2SX | Vulnerable; migrate to 12.2(18)SXD7a or later |
|------------+-----------------------------------------------------------|
| 12.2SXA | Vulnerable; migrate to 12.2(18)SXD7a or later |
|------------+-----------------------------------------------------------|
| 12.2SXB | Vulnerable; migrate to 12.2(18)SXD7a or later |
|------------+-----------------------------------------------------------|
| 12.2SXD | 12.2(18)SXD7a | |
|------------+----------------------------+------------------------------|
| 12.2SXE | 12.2(18)SXE6 | |
|------------+----------------------------+------------------------------|
| 12.2SXF | 12.2(18)SXF5 | |
|------------+-----------------------------------------------------------|
| 12.2SY | Vulnerable; migrate to 12.2(18)SXD7a or later |
|------------+-----------------------------------------------------------|
| 12.2SZ | Vulnerable; migrate to 12.2(25)S12 or later; Available |
| | 12-Feb-07 |
|------------+-----------------------------------------------------------|
| 12.2T | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2TPC | Vulnerable; contact TAC |
|------------+-----------------------------------------------------------|
| 12.2XA | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XB | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XC | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2XD | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XE | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XF | Vulnerable; migrate to 12.3(13a)BC6 or later |
|------------+-----------------------------------------------------------|
| 12.2XG | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XH | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XI | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XJ | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XK | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XL | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XM | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XN | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XQ | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XR | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XS | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XT | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XU | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XV | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2XW | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2YA | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2YB | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2YC | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2YD | Vulnerable; migrate to 12.3(11)T11 or later |
|------------+-----------------------------------------------------------|
| 12.2YE | Vulnerable; migrate to 12.2(25)S12 or later; Available |
| | 12-Feb-07 |
|------------+-----------------------------------------------------------|
| 12.2YF | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2YG | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2YH | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2YJ | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2YK | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2YL | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2YM | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2YN | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2YO | Not vulnerable |
|------------+-----------------------------------------------------------|
| 12.2YP | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2YQ | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2YR | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2YS | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2YT | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2YU | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2YV | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2YW | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2YX | Vulnerable; migrate to 12.4(8) or later |
|------------+-----------------------------------------------------------|
| 12.2YY | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2YZ | Vulnerable; migrate to 12.2(25)S12 or later; Available |
| | 12-Feb-07 |
|------------+-----------------------------------------------------------|
| 12.2ZA | Vulnerable; migrate to 12.2(18)SXD7a or later |
|------------+-----------------------------------------------------------|
| 12.2ZB | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2ZC | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2ZD | Vulnerable; contact TAC |
|------------+-----------------------------------------------------------|
| 12.2ZE | Vulnerable; migrate to 12.3(19) or later |
|------------+-----------------------------------------------------------|
| 12.2ZF | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2ZG | Vulnerable; contact TAC |
|------------+-----------------------------------------------------------|
| 12.2ZH | Vulnerable; contact TAC |
|------------+-----------------------------------------------------------|
| 12.2ZJ | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2ZL | Vulnerable; contact TAC |
|------------+-----------------------------------------------------------|
| 12.2ZN | Vulnerable; migrate to 12.3(4)T13 or later |
|------------+-----------------------------------------------------------|
| 12.2ZP | Vulnerable; migrate to 12.4(8) or later |
|------------+-----------------------------------------------------------|
| Affected | | |
| 12.3-Based | Rebuild | Maintenance |
| Release | | |
|------------+----------------------------+------------------------------|
| 12.3 | 12.3(10f) | 12.3(19) |
|------------+-----------------------------------------------------------|
| 12.3B | Vulnerable; migrate to 12.3(11)T11 or later |
|------------+-----------------------------------------------------------|
| | 12.3(13a)BC6 | |
|12.3BC |----------------------------+------------------------------|
| | 12.3(17a)BC2 | |
|------------+-----------------------------------------------------------|
| 12.3BW | Vulnerable; migrate to 13.3(11)T11 or later |
|------------+-----------------------------------------------------------|
| 12.3JA | 12.3(8)JA2 | |
|------------+-----------------------------------------------------------|
| 12.3JEA | All 12.3JEA releases are fixed |
|------------+-----------------------------------------------------------|
| 12.3JEB | All 12.3JEB releases are fixed |
|------------+-----------------------------------------------------------|
| 12.3JK | 12.3(2)JK2 | |
|------------+----------------------------+------------------------------|
| 12.3JX | 12.3(7)JX4 | 12.3(11)JX |
|------------+----------------------------+------------------------------|
| | 12.3(4)T13 | |
| |----------------------------+------------------------------|
| | 12.3(11)T11 | |
| |----------------------------+------------------------------|
| 12.3T | Limited platform support | |
| | is available: Contact TAC | |
| |----------------------------+------------------------------|
| | Please migrate to 12.4(8) | |
| | or later | |
|------------+-----------------------------------------------------------|
| 12.3TPC | Vulnerable; contact TAC |
|------------+-----------------------------------------------------------|
| 12.3XA | Vulnerable; contact TAC |
|------------+-----------------------------------------------------------|
| 12.3XB | Vulnerable; migrate to 12.3(11)T11 or later |
|------------+-----------------------------------------------------------|
| 12.3XC | Vulnerable; contact TAC |
|------------+-----------------------------------------------------------|
| 12.3XD | Vulnerable; migrate to 12.3(11)T11 or later |
|------------+-----------------------------------------------------------|
| 12.3XE | Vulnerable; contact TAC |
|------------+-----------------------------------------------------------|
| 12.3XF | Vulnerable; migrate to 12.3(11)T11 or later |
|------------+-----------------------------------------------------------|
| 12.3XG | Vulnerable; contact TAC |
|------------+-----------------------------------------------------------|
| 12.3XH | Vulnerable; migrate to 12.3(11)T11 or later |
|------------+-----------------------------------------------------------|
| 12.3XI | 12.3(7)XI8 | |
|------------+-----------------------------------------------------------|
| 12.3XJ | Vulnerable; migrate to 12.3(14)YX2 or later |
|------------+-----------------------------------------------------------|
| 12.3XK | Vulnerable; migrate to 12.4(8) or later |
|------------+-----------------------------------------------------------|
| 12.3XQ | Vulnerable; migrate to 12.4(8) or later |
|------------+-----------------------------------------------------------|
| 12.3XR | Vulnerable; contact TAC |
|------------+-----------------------------------------------------------|
| 12.3XS | Vulnerable; migrate to 12.4(8) or later |
|------------+-----------------------------------------------------------|
| 12.3XU | Vulnerable; migrate to 12.4(2)T5 or later |
|------------+-----------------------------------------------------------|
| 12.3XW | Vulnerable; migrate to 12.3(14)YX2 or later |
|------------+-----------------------------------------------------------|
| 12.3XX | Vulnerable; migrate to 12.4(8) or later |
|------------+-----------------------------------------------------------|
| 12.3XY | Vulnerable; migrate to 12.4(8) or later |
|------------+-----------------------------------------------------------|
| 12.3YA | Vulnerable; contact TAC |
|------------+-----------------------------------------------------------|
| 12.3YD | Vulnerable; migrate to 12.4(2)T5 or later |
|------------+-----------------------------------------------------------|
| 12.3YF | Vulnerable; migrate to 12.3(14)YX2 or later |
|------------+-----------------------------------------------------------|
| 12.3YG | Vulnerable; migrate to 12.4(2)T5 or later |
|------------+-----------------------------------------------------------|
| 12.3YH | Vulnerable; migrate to 12.4(2)T5 or later |
|------------+-----------------------------------------------------------|
| 12.3YI | Vulnerable; migrate to 12.4(2)T5 or later |
|------------+-----------------------------------------------------------|
| 12.3YJ | Vulnerable; migrate to 12.3(14)YQ8 or later |
|------------+-----------------------------------------------------------|
| 12.3YK | Vulnerable; migrate to 12.4(4)T4 or later |
|------------+-----------------------------------------------------------|
| 12.3YM | 12.3(14)YM8 | |
|------------+----------------------------+------------------------------|
| 12.3YQ | 12.3(14)YQ8 | |
|------------+-----------------------------------------------------------|
| 12.3YS | Vulnerable; migrate to 12.4(4)T4 or later |
|------------+-----------------------------------------------------------|
| 12.3YT | Vulnerable; migrate to 12.4(4)T4 or later |
|------------+-----------------------------------------------------------|
| 12.3YU | Vulnerable; contact TAC |
|------------+-----------------------------------------------------------|
| 12.3YX | 12.3(14)YX2 | |
|------------+----------------------------+------------------------------|
| 12.3YZ | 12.3(11)YZ1 | |
|------------+----------------------------+------------------------------|
| Affected | | |
| 12.4-Based | Rebuild | Maintenance |
| Release | | |
|------------+----------------------------+------------------------------|
| | 12.4(3e) | |
|12.4 |----------------------------+------------------------------|
| | 12.4(7b) | 12.4(8) |
|------------+----------------------------+------------------------------|
| 12.4MR | 12.4(6)MR1 | |
|------------+-----------------------------------------------------------|
| 12.4SW | All 12.4SW releases are fixed |
|------------+-----------------------------------------------------------|
| | 12.4(2)T5 | |
| |----------------------------+------------------------------|
| 12.4T | 12.4(4)T4 | |
| |----------------------------+------------------------------|
| | 12.4(6)T3 | 12.4(9)T |
|------------+-----------------------------------------------------------|
| 12.4XA | Vulnerable; migrate to 12.4(6)T3 |
|------------+-----------------------------------------------------------|
| 12.4XB | Vulnerable; contact TAC |
|------------+-----------------------------------------------------------|
| 12.4XC | 12.4(4)XC3 | |
|------------+----------------------------+------------------------------|
| 12.4XD | 12.4(4)XD4 | |
|------------+-----------------------------------------------------------|
| 12.4XE | All 12.4XE releases are fixed |
|------------+-----------------------------------------------------------|
| 12.4XG | All 12.4XG releases are fixed |
|------------+-----------------------------------------------------------|
| 12.4XJ | All 12.4XJ releases are fixed |
|------------+-----------------------------------------------------------|
| 12.4XP | All 12.4XP releases are fixed |
|------------+-----------------------------------------------------------|
| 12.4XT | All 12.4XT releases are fixed |
+------------------------------------------------------------------------+
Workarounds
===========
Additional mitigations that can be deployed on Cisco devices within
the network are available in the Cisco Applied Intelligence companion
document for this advisory:
http://www.cisco.com/warp/public/707/cisco-air-20070124-crafted-tcp.shtml
Note: Configuring VTY access-class filters is not an effective
mitigation strategy for this vulnerability.
Infrastructure ACLs (iACL)
+-------------------------
Although it is often difficult to block traffic transiting your
network, it is possible to identify traffic which should never be
allowed to target your infrastructure devices and block that traffic
at the border of your network. Infrastructure ACLs are considered a
network security best practice and should be considered as a
long-term addition to good network security as well as a workaround
for this specific vulnerability. The ACL example shown below should
be included as part of the deployed infrastructure access-list which
will protect all devices with IP addresses in the infrastructure IP
address range.
A sample access list for devices running Cisco IOS is below:
!--- Permit TCP services from trust hosts destined
!--- to infrastructure addresses.
access-list 150 permit tcp TRUSTED_HOSTS MASK INFRASTRUCTURE_ADDRESSES MASK
!--- Deny TCP packets from all other sources destined to infrastructure addresses.
access-list 150 deny tcp any INFRASTRUCTURE_ADDRESSES MASK
!--- Permit all other traffic to transit the device.
access-list 150 permit IP any any
interface serial 2/0
ip access-group 150 in
The white paper entitled "Protecting Your Core: Infrastructure
Protection Access Control Lists" presents guidelines and recommended
deployment techniques for infrastructure protection access lists.
This white paper can be obtained here:
http://www.cisco.com/warp/public/707/iacl.html
Receive ACLs (rACL)
+------------------
For distributed platforms, Receive ACLs may be an option starting in
Cisco IOS Software Versions 12.0(21)S2 for the 12000 (GSR), 12.0(24)S
for the 7500, and 12.0(31)S for the 10720. The Receive ACL protects
the device from harmful traffic before the traffic can impact the
route processor. Receive ACLs are designed to only protect the device
on which it is configured. On the 12000, transit traffic is never
affected by a receive ACL. Because of this, the destination IP
address "any" used in the example ACL entries below only refer to the
router's own physical or virtual IP addresses. On the 7500 and 10720,
transit traffic with IP options set will be subject to the Receive
ACL and permitted or denied accordingly. Receive ACLs are considered
a network security best practice, and should be considered as a
long-term addition to good network security, as well as a workaround
for this specific vulnerability. The white paper entitled "GSR:
Receive Access Control Lists" will help you identify and allow
legitimate traffic to your device and deny all unwanted packets:
http://www.cisco.com/warp/public/707/racl.html
The following is the receive path ACL written to permit this type of
traffic from trusted hosts:
!--- Permit tcp services from trusted hosts allowed to the RP.
access-list 151 permit tcp TRUSTED_ADDRESSES MASK any
!--- Deny tcp services from all other sources to the RP.
access-list 151 deny tcp any any
!--- Permit all other traffic to the RP.
access-list 151 permit ip any any
!--- Apply this access list to the 'receive' path.
ip receive access-list 151
Control Plane Policing (CoPP)
+----------------------------
The Control Plane Policing (CoPP) feature may be used to mitigate
this vulnerability. In the following example, only TCP traffic from
trusted hosts and with 'receive' destination IP addresses is
permitted to reach the route processor (RP). All other 'transit' IP
traffic is unaffected.
It should be noted that dropping traffic from unknown or untrusted IP
addresses may affect hosts with dynamically assigned IP addresses
from connecting to the Cisco IOS device.
access-list 152 deny tcp TRUSTED_ADDRESSES MASK any
access-list 152 permit tcp any any
access-list 152 deny ip any any
!
class-map match-all permit-tcp-class
match access-group 152
!
!
policy-map permit-tcp-policy
class permit-tcp-class
drop
!
control-plane
service-policy input permit-tcp-policy
In the above CoPP example, the ACL entries that match the exploit
packets with the "permit" action result in these packets being
discarded by the policy-map "drop" function, while packets that match
the "deny" action are not affected by the policy-map drop function.
Please note that in the 12.2S and 12.0S Cisco IOS trains the
policy-map syntax is different:
policy-map permit-tcp-policy
class class permit-tcp-class
police 32000 1500 1500 conform-action drop exceed-action drop
CoPP is available in Cisco IOS release trains 12.0S, 12.2SX, 12.2S,
12.3T, 12.4, and 12.4T.
Additional information on the configuration and use of the CoPP
feature can be found at the following URL:
http://www.cisco.com/en/US/products/ps6642/products_white_paper0900aecd804fa16a.shtml
Anti-spoofing
+------------
The Unicast Reverse Path Forwarding (Unicast RPF or uRPF) feature
helps to mitigate problems that are caused by spoofed IP source
addresses. It is available on Cisco routers and firewalls. For
further details, please refer to:
http://www.cisco.com/en/US/partner/products/ps6441/products_command_reference_chapter09186a00804ae49f.html#wp1229984
By enabling Unicast Reverse Path Forwarding (uRPF), all spoofed
packets will be dropped at the first device. To enable uRPF, use the
following commands.
router(config)# ip cef
router(config)# interface interface #
router(config-if)# ip verify unicast source reachable-via rx
BGP and BTSH/GTSM
+----------------
Depending on your release of software, it may be possible to protect
your BGP sessions from this memory leak. With the introduction of
CSCee73956, Cisco IOS has improved support for BTSH (BGP TTL Security
Hack) to reduce, if not eliminate a risk of a memory leak due to this
vulnerability. This functionality is also known as GTSM (Generalized
TTL Security Mechanism) and documented in RFC 3682. This section
refers to GTSM as applied to eBGP sessions only.
Releases of Cisco IOS that contain CSCee73956 are protected from this
attack against the BGP port (TCP port 179) only. Other ports should
be protected accordingly.
BTSH is not supported for iBGP sessions. BTSH was first introduced in
Cisco IOS in 12.0(27)S, 12.3(7)T and 12.2(25)S. Note that the BTSH
feature prior to CSCee73956 will not protect against this
vulnerability.
For more information on BTSH, please see:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123t/123t_7/gt_btsh.htm
BGP and MD5
+----------
Configuring your Cisco IOS device for BGP MD5 authentication is a
valid workaround to help protect the vulnerable device from crafted
TCP packets sent against the BGP port (TCP 179).
This can be configured as shown in the following example:
router(config)# router bgp
router(config-router)# neighbor <IP_address> password <enter_your_secret_here>
It may be necessary to configure the same shared MD5 secret on both
peers and at the same time. The introduction of CSCdx23494 will allow
dynamically changing BGP MD5 keys without tearing the BGP session
down.
Although the BGP session will not be reset, BGP updates will not be
processed until the same MD5 key is configured on both sides.
Prior to the introduction of CSCdx23494, failure to change the MD5
passwords at the same time will break the existing BGP session, and
the new session will not get established until the exact same MD5
shared secret is configured on both devices. For a detailed
discussion on how to configure BGP, refer to the following document:
Once the MD5 shared secret is configured, it is prudent to change it
periodically. The exact period of time must fit within your company
security policy.
Obtaining Fixed Software
========================
Cisco will make free software available to address this vulnerability
for affected customers. This advisory will be updated as fixed
software becomes available. Prior to deploying software, customers
should consult their maintenance provider or check the software for
feature set compatibility and known issues specific to their
environment.
Customers may only install and expect support for the feature sets
they have purchased. By installing, downloading, accessing or
otherwise using such software upgrades, customers agree to be bound by
the terms of Cisco's software license terms found at
http://www.cisco.com/public/sw-license-agreement.html, or as otherwise
set forth at Cisco.com Downloads at
http://www.cisco.com/public/sw-center/sw-usingswc.shtml.
Do not contact either "psirt@cisco.com" or "security-alert@cisco.com"
for software upgrades.
Customers with Service Contracts
+-------------------------------
Customers with contracts should obtain upgraded software through
their regular update channels. For most customers, this means that
upgrades should be obtained through the Software Center on Cisco's
worldwide website at http://www.cisco.com.
Customers using Third Party Support Organizations
+------------------------------------------------
Customers whose Cisco products are provided or maintained through
prior or existing agreement with third-party support organizations
such as Cisco Partners, authorized resellers, or service providers
should contact that support organization for guidance and assistance
with the appropriate course of action in regards to this advisory.
The effectiveness of any workaround or fix is dependent on specific
customer situations such as product mix, network topology, traffic
behavior, and organizational mission. Due to the variety of affected
products and releases, customers should consult with their service
provider or support organization to ensure any applied workaround or
fix is the most appropriate for use in the intended network before it
is deployed.
Customers without Service Contracts
+----------------------------------
Customers who purchase direct from Cisco but who do not hold a Cisco
service contract and customers who purchase through third-party
vendors but are unsuccessful at obtaining fixed software through
their point of sale should get their upgrades by contacting the Cisco
Technical Assistance Center (TAC). TAC contacts are as follows.
* +1 800 553 2447 (toll free from within North America)
* +1 408 526 7209 (toll call from anywhere in the world)
* e-mail: tac@cisco.com
Have your product serial number available and give the URL of this
notice as evidence of your entitlement to a free upgrade. Free
upgrades for non-contract customers must be requested through the
TAC.
Refer to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml
for additional TAC contact information, including special localized
telephone numbers and instructions and e-mail addresses for use in
various languages.
Exploitation and Public Announcements
=====================================
The Cisco PSIRT is not aware of any public announcements or malicious
use of the vulnerability described in this advisory.
This vulnerability was discovered by Cisco during our internal
testing process.
Status of this Notice: FINAL
============================
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY
KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE
INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS
AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS
DOCUMENT AT ANY TIME.
A stand-alone copy or Paraphrase of the text of this document that
omits the distribution URL in the following section is an
uncontrolled copy, and may lack important information or contain
factual errors.
Distribution
============
This advisory is posted on Cisco's worldwide website at:
http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-tcp.shtml
In addition to worldwide web posting, a text version of this notice
is clear-signed with the Cisco PSIRT PGP key and is posted to the
following e-mail and Usenet news recipients.
* cust-security-announce@cisco.com
* first-teams@first.org
* bugtraq@securityfocus.com
* vulnwatch@vulnwatch.org
* cisco@spot.colorado.edu
* cisco-nsp@puck.nether.net
* full-disclosure@lists.grok.org.uk
* comp.dcom.sys.cisco@newsgate.cisco.com
Future updates of this advisory, if any, will be placed on Cisco's
worldwide website, but may or may not be actively announced on
mailing lists or newsgroups. Users concerned about this problem are
encouraged to check the above URL for any updates.
Revision History
================
+---------------------------------------+
| 1.1 | 2007-January-29 | BGP and MD5 |
| | | update. |
|-----+-----------------+---------------|
| | | Initial |
| 1.0 | 2007-January-24 | public |
| | | release. |
+---------------------------------------+
Cisco Security Procedures
=========================
Complete information on reporting security vulnerabilities in Cisco
products, obtaining assistance with security incidents, and
on Cisco's worldwide website at
http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html.
This includes instructions for press inquiries regarding Cisco
security notices. All Cisco security advisories are available at
http://www.cisco.com/go/psirt.
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/render.html?cid=1980
If you believe that your computer system has been compromised or attacked in
any way, we encourage you to let us know by completing the secure National IT
Incident Reporting Form at:
http://www.auscert.org.au/render.html?it=3192
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
iQCVAwUBRcAONih9+71yA2DNAQLu3AP8CsmlwSETvfvlL8Ci+vvnwfmxHmCQC9BB
h95PRCwyjLg6BkIJo7pjCMXCTpE+uE5xLogx6rKZLmS83g5meuaP5U+/5Jv7vpWl
FTCA2o354p4c9GkettQoD7y4PCkl4uA/M5Wx32/K2Ah3Fy2U/io+F46ZukpW//b2
m7WHECNHeVQ=
=G7vS
-----END PGP SIGNATURE-----
|