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AUSCERT External Security Bulletin Redistribution
ESB-2017.1574
Cisco Virtualized Packet Core-Distributed Instance Denial of
Service Vulnerability
22 June 2017
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Virtualized Packet Core-Distributed
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-6678
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170621-vpc
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Cisco Security Advisory
Cisco Virtualized Packet Core-Distributed Instance Denial of Service
Vulnerability
High
Advisory ID:
cisco-sa-20170621-vpc
First Published:
2017 June 21 16:00 GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCvc01665
CSCvc35565
CVE-2017-6678
CWE-399
CVSS Score:
Base 8.6, Temporal 8.6
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
CVE-2017-6678
CWE-399
Summary
A vulnerability in the ingress UDP packet processing functionality of
Cisco Virtualized Packet CoreDistributed Instance (VPCDI) Software could
allow an unauthenticated, remote attacker to cause both control function
(CF) instances on an affected system to reload, resulting in a denial of
service (DoS) condition.
The vulnerability is due to insufficient handling of user-supplied data by
the affected software. An attacker could exploit this vulnerability by
sending crafted UDP packets to the distributed instance (DI) network
addresses of both CF instances on an affected system. A successful exploit
could allow the attacker to cause an unhandled error condition on the
affected system, which would cause the CF instances to reload and
consequently cause the entire VPC to reload, resulting in the disconnection
of all subscribers and a DoS condition on the affected system.
This vulnerability can be exploited via IPv4 traffic only.
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-20170621-vpc
Affected Products
Vulnerable Products
This vulnerability affects Cisco Virtualized Packet CoreDistributed
Instance (VPCDI) Software running any release of the Cisco StarOS
operating system prior to the first fixed release.
To determine whether a vulnerable release of Cisco StarOS is running on a
VPC-DI instance, administrators can use the show version command in the
device CLI. The following example shows the output of the command for a
VPCDI instance that is running Cisco StarOS Release 19.3.v5 (VPCDI
Release N4.2.5):
[local]VPC-001# show version
Active Software:
Image Version: 19.3.v5
Image Build Number: 65002
Image Description: Deployment_Build
Image Date: Wed Sep 14 05:35:14 EDT 2016
Boot Image: /flash/qvpc-di-19.3.v5.bin
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Virtualized Packet CoreSingle Instance (VPCSI) Software
ASR 5000 Series Aggregation Services Routers
Elastic Services Controllers
Ultra Automation Services
Details
A DI network interconnects the virtual machines (VMs) in a VPCDI instance
to enable the VMs to communicate with each other. The DI network should be
a unique, isolated network reserved for the exclusive use of a single
VPCDI instance. No other devices should be connected to the DI network. If
more than one VPCDI instance is instantiated in the same data center, each
instance should have its own DI network.
To exploit this vulnerability, the attacker needs to be able to send UDP
packets to the DI network interface of a VPCDI instance via IPv4.
The vulnerable code exists only in VPCDI Software. This vulnerability does
not exist in Cisco VPCSI Software or the other Cisco products listed in
the Products Confirmed Not Vulnerable section.
Workarounds
There are no workarounds that address this vulnerability.
Fixed Software
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:
http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.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:
http://www.cisco.com/en/US/support/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.
Fixed Releases
In the following table, the first column lists major releases of
Cisco VPCDI Software and, parenthetically, the associated release of the
Cisco StarOS operating system. The second and third columns indicate the
first minor release that includes the fix for the Cisco bugs associated
with this vulnerability. The fourth column indicates the recommended
release to install to address this vulnerability.
Customers should upgrade to an appropriate release as indicated in the
following table:
Cisco VPCDI First Fixed First Fixed
Software Release for Release for Recommended Release
and Cisco StarOS Cisco Bug Cisco Bug
Major Release CSCvc01665 CSCvc35565
N4.0 (19.2) N4.2.6 (19.3.v6) N4.2.7 (19.3.v7) N4.2.7 (19.3.v7) or
later
N4.2 (19.3) N4.2.6 (19.3.v6) N4.2.7 (19.3.v7) N4.2.7 (19.3.v7) or
later
N4.5 (20.0) N4.7.2 (20.2.v2) N4.7.2 (20.2.v2) N4.7.2 (20.2.v2) or
later
N4.6 (20.1) N4.7.2 (20.2.v2) N4.7.2 (20.2.v2) N4.7.2 (20.2.v2) or
later
N4.7 (20.2) N4.7.2 (20.2.v2) N4.7.2 (20.2.v2) N4.7.2 (20.2.v2) or
later
N5.0 (21.0) Not affected N5.1 (21.1.v0) N5.1 (21.1.v0) or
later
N5.1 (21.1) Not affected Not affected Not affected
Customers with active service contracts can download fixed software
releases from the Cisco File Exchange.
Exploitation and Public Announcements
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
This vulnerability was found during the resolution of a customer support
case.
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-20170621-vpc
Revision History
Version Description Section Status Date
1.0 Initial public release. Final 2017-June-21
Legal Disclaimer
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 standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.
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
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