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AUSCERT External Security Bulletin Redistribution
ESB-2018.2903.2
Multiple vulnerabilities have been identified in Cisco IOS
16 July 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IOS Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-15376 CVE-2018-15375 CVE-2018-0473
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-ptp
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-ir800-memwrite
Comment: This bulletin contains two (2) Cisco Systems security advisories.
Revision History: July 16 2019: Added bug IDs and minor updates for cisco-sa-20180926-ptp
September 27 2018: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco IOS Software Precision Time Protocol Denial of Service Vulnerability
Priority: High
Advisory ID: cisco-sa-20180926-ptp
First Published: 2018 September 26 16:00 GMT
Last Updated: 2019 July 15 19:24 GMT
Version 1.1: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvf94015CSCvh77659CSCvn28545CSCvn28552CSCvn28572
CVE-2018-0473
CWE-399
CVSS Score:
7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the Precision Time Protocol (PTP) subsystem of Cisco IOS
Software could allow an unauthenticated, remote attacker to cause a denial
of service (DoS) condition of the Precision Time Protocol.
The vulnerability is due to insufficient processing of PTP packets. An
attacker could exploit this vulnerability by sending a custom PTP packet
to, or through, an affected device. A successful exploit could allow the
attacker to cause a DoS condition for the PTP subsystem, resulting in time
synchronization issues across the network.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20180926-ptp
This advisory is part of the September 26, 2018, release of the Cisco IOS
and IOS XE Software Security Advisory Bundled Publication, which includes
12 Cisco Security Advisories that describe 13 vulnerabilities. For a
complete list of the advisories and links to them, see Cisco Event
Response: September 2018 Semiannual Cisco IOS and IOS XE Software Security
Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products that are running a
vulnerable release of Cisco IOS Software and are configured to process PTP
packets:
2500 Series Connected Grid Switches
Connected Grid Ethernet Switch Module Interface Card
Industrial Ethernet 2000 Series Switches
Industrial Ethernet 3000 Series Switches
Industrial Ethernet 3010 Series Switches
Industrial Ethernet 4000 Series Switches
Industrial Ethernet 4010 Series Switches
Industrial Ethernet 5000 Series Switches
The Precision Time Protocol is enabled by default.
For information about which Cisco IOS Software releases are vulnerable and
the availability of fixed software for vulnerable products, see the Fixed
Software section of this advisory.
Determining the Cisco IOS Software Release
To determine which Cisco IOS Software release is running on a device,
administrators can log in to the device, use the show version command in
the CLI, and then refer to the system banner that appears. If the device is
running Cisco IOS Software, the system banner displays text similar to
Cisco Internetwork Operating System Software or Cisco IOS Software . The
banner also displays the installed image name in parentheses, followed by
the Cisco IOS Software release number and release name. Some Cisco devices
do not support the show version command or may provide different output.
The following example shows the output of the command for a device that is
running Cisco IOS Software Release 15.5(2)T1 and has an installed image
name of C2951-UNIVERSALK9-M :
Router> show version
Cisco IOS Software, C2951 Software (C2951-UNIVERSALK9-M), Version 15.5(2)T1, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Mon 22-Jun-15 09:32 by prod_rel_team
.
.
.
For information about the naming and numbering conventions for Cisco IOS
Software releases, see the Cisco IOS and NX-OS Software Reference Guide .
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the Industrial
Ethernet 2000U Series Switches.
Cisco has confirmed that this vulnerability does not affect Cisco IOS XE
Software, Cisco IOS XR Software, or Cisco NX-OS Software.
Details
o To determine if the Precision Time Protocol is enabled, administrators can
log in to the device, use the show ptp clock command in the CLI, and then
review the output. The following output of the show ptp clock command shows
the device is configured as a boundary clock:
switch# show ptp clock
PTP CLOCK INFO
PTP Device Type: Boundary clock
PTP Device Profile: Power Profile
.
.
.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades, customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page , to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC:
https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Cisco IOS Software
To help customers determine their exposure to vulnerabilities in Cisco IOS
Software, Cisco provides a tool, the Cisco IOS Software Checker , that
identifies any Cisco Security Advisories that impact a specific Cisco IOS
Software release and the earliest release that fixes the vulnerabilities
described in each advisory ("First Fixed"). If applicable, the tool also
returns the earliest release that fixes all the vulnerabilities described
in all the advisories identified ("Combined First Fixed").
Customers can use this tool to perform the following tasks:
Initiate a search by choosing one or more releases from a drop-down
list or uploading a file from a local system for the tool to parse
Enter the output of the show version command for the tool to parse
Create a custom search by including all previously published Cisco
Security Advisories, a specific advisory, or all advisories in the most
recent bundled publication
To determine whether a release is affected by any published Cisco Security
Advisory, use the Cisco IOS Software Checker on Cisco.com or enter a Cisco
IOS Software release-for example, 15.1(4)M2 -in the following field:
[ ] [Check]
By default, the Cisco IOS Software Checker includes results only for
vulnerabilities that have a Critical or High Security Impact Rating (SIR).
To include results for Medium SIR vulnerabilities, use the Cisco IOS
Software Checker on Cisco.com and check the Medium check box in the Impact
Rating drop-down list.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found during the resolution of a Cisco TAC support
case.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Related to This Advisory
o Cisco Event Response: September 2018 Semiannual Cisco IOS and IOS XE
Software Security Advisory Bundled Publication
Cisco Security Blog: Cisco IOS and IOS XE Software Bundled Publication
September 2018
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20180926-ptp
Revision History
o +---------+---------------------+------------+--------+-------------------+
| Version | Description | Section | Status | Date |
+---------+---------------------+------------+--------+-------------------+
| | Added bug IDs. | Cisco Bug | | |
| | Removed Industrial | IDs, | | |
| 1.1 | Ethernet 2000U from | Affected | Final | 2019-July-15 |
| | Affected Products. | Products, | | |
| | Fixes are available | and Fixed | | |
| | for all platforms. | Software | | |
+---------+---------------------+------------+--------+-------------------+
| 1.0 | Initial public | - | Final | 2018-September-26 |
| | release. | | | |
+---------+---------------------+------------+--------+-------------------+
- -------------------------------------------------------------------------------
Cisco Security Advisory
Cisco IOS Software for Cisco 800 Series Industrial Integrated Services Routers
Arbitrary Memory Write Vulnerabilities
Priority: Medium
Advisory ID: cisco-sa-20180926-ir800-memwrite
First Published: 2018 September 26 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCuy10473, CSCvc82464
CVE-2018-15375
CVE-2018-15376
CWE-123
CVSS Score: Base 6.7
CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
* Multiple vulnerabilities in the embedded test subsystem of Cisco IOS
Software for Cisco 800 Series Industrial Integrated Services Routers could
allow an authenticated, local attacker to write arbitrary values to
arbitrary locations in the memory space of an affected device.
The vulnerabilities are due to the presence of certain test commands that
were intended to be available only in internal development builds of the
affected software. An attacker could exploit these vulnerabilities by using
these commands on an affected device. A successful exploit could allow the
attacker to write arbitrary values to arbitrary locations in the memory
space of the affected device.
There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-ir800-memwrite
Affected Products
* Vulnerable Products
These vulnerabilities affect the following Cisco devices if they are
running a vulnerable release of Cisco IOS Software:
+ 807 Industrial Integrated Services Router
+ 809 Industrial Integrated Services Router
+ 829 Industrial Integrated Services Router
For information about which Cisco IOS Software releases are vulnerable, see
the Fixed Software section of this advisory.
Determining the Cisco IOS Software Release
To determine which Cisco IOS Software release is running on a device,
administrators can log in to the device, use the show version command in
the CLI, and then refer to the system banner that appears. If the device is
running Cisco IOS Software, the system banner displays text similar to
Cisco Internetwork Operating System Software or Cisco IOS Software. The
banner also displays the installed image name in parentheses, followed by
the Cisco IOS Software release number and release name. Some Cisco devices
do not support the show version command or may provide different output.
The following example shows the output of the command for a device that is
running Cisco IOS Software Release 15.5(2)T1 and has an installed image
name of C2951-UNIVERSALK9-M:
Router> show version
Cisco IOS Software, C2951 Software (C2951-UNIVERSALK9-M), Version 15.5(2)T1, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Mon 22-Jun-15 09:32 by prod_rel_team
.
.
.
For information about the naming and numbering conventions for Cisco IOS
Software releases, see the Cisco IOS and NX-OS Software Reference Guide.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by these vulnerabilities.
Cisco has confirmed that these vulnerabilities do not affect Cisco IOS XE
Software, Cisco IOS XR Software, or Cisco NX-OS Software.
Workarounds
* There are no workarounds that address these vulnerabilities.
Fixed Software
* For detailed information about affected and fixed software releases,
consult the Cisco IOS Software Checker.
When considering software upgrades, customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page, to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Cisco IOS Software
To help customers determine their exposure to vulnerabilities in Cisco IOS
Software, Cisco provides a tool, the Cisco IOS Software Checker, that
identifies any Cisco Security Advisories that impact a specific Cisco IOS
Software release and the earliest release that fixes the vulnerabilities
described in each advisory (?First Fixed?). If applicable, the tool also
returns the earliest release that fixes all the vulnerabilities described
in all the advisories identified (?Combined First Fixed?).
Customers can use this tool to perform the following tasks:
+ Initiate a search by choosing one or more releases from a drop-down
list or uploading a file from a local system for the tool to parse
+ Enter the output of the show version command for the tool to parse
+ Create a custom search by including all previously published Cisco
Security Advisories, a specific advisory, or all advisories in the most
recent bundled publication
To determine whether a release is affected by any published Cisco Security
Advisory, use the Cisco IOS Software Checker on Cisco.com or enter a
Cisco IOS Software release?for example, 15.1(4)M2?in the following field:
[ ] [Check]
By default, the Cisco IOS Software Checker includes results only for
vulnerabilities that have a Critical or High Security Impact Rating (SIR).
To include results for Medium SIR vulnerabilities, use the Cisco IOS
Software Checker on Cisco.com and check the Medium check box in the Impact
Rating drop-down list.
Exploitation and Public Announcements
* The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerabilities that are
described in this advisory.
Source
* These vulnerabilities were found during internal security testing.
Cisco Security Vulnerability Policy
* To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Subscribe to Cisco Security Notifications
* Subscribe
URL
* https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-ir800-memwrite
Revision History
+----------------------------------------------------------------------------+
| Version | Description | Section | Status | Date |
|---------+--------------------------+---------+--------+--------------------|
| 1.0 | Initial public release. | | Final | 2018-September-26 |
+----------------------------------------------------------------------------+
- --------------------------END INCLUDED TEXT--------------------
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