Cisco Security Advisory: Multiple Cisco IOS Session Initiation Protocol Denial of Service Vulnerabilities
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Cisco Security Advisory: Multiple Cisco IOS Session Initiation
Protocol Denial of Service Vulnerabilities
Advisory ID: cisco-sa-20080924-sip
http://www.cisco.com/warp/public/707/cisco-sa-20080924-sip.shtml
Revision 1.0
For Public Release 2008 September 24 1600 UTC (GMT)
- ---------------------------------------------------------------------
Summary
=======
Multiple vulnerabilities exist in the Session Initiation Protocol
(SIP) implementation in Cisco IOS that can be exploited remotely to
trigger a memory leak or to cause a reload of the IOS device.
Cisco has released free software updates that address these
vulnerabilities. Fixed Cisco IOS software listed in the Software
Versions and Fixes section contains fixes for all vulnerabilities
addressed in this advisory.
There are no workarounds available to mitigate the effects of any of
the vulnerabilities apart from disabling the protocol or feature
itself, if administrators do not require the Cisco IOS device to
provide voice over IP services.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080924-sip.shtml
Note: The September 24, 2008 IOS Advisory bundled publication
includes twelve Security Advisories. Eleven of the advisories address
vulnerabilities in Cisco's IOS software, and one advisory addresses
vulnerabilities in Cisco Unified Communications Manager. Each
Advisory lists the releases that correct the vulnerability described
in the Advisory. Please reference the following software table to
find a release that fixes all published IOS software Advisories as of
September 24th, 2008:
http://www.cisco.com/warp/public/707/cisco-sa-20080924-bundle.shtml
Individual publication links are listed below:
* http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosips.shtml
* http://www.cisco.com/warp/public/707/cisco-sa-20080924-ssl.shtml
* http://www.cisco.com/warp/public/707/cisco-sa-20080924-cucm.shtml
* http://www.cisco.com/warp/public/707/cisco-sa-20080924-vpn.shtml
* http://www.cisco.com/warp/public/707/cisco-sa-20080924-mfi.shtml
* http://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.shtml
* http://www.cisco.com/warp/public/707/cisco-sa-20080924-ubr.shtml
* http://www.cisco.com/warp/public/707/cisco-sa-20080924-multicast.shtml
* http://www.cisco.com/warp/public/707/cisco-sa-20080924-sccp.shtml
* http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosfw.shtml
* http://www.cisco.com/warp/public/707/cisco-sa-20080924-l2tp.shtml
Affected Products
=================
These vulnerabilities only affect devices running Cisco IOS that have
SIP voice services enabled.
Vulnerable Products
+------------------
Cisco devices running affected Cisco IOS versions and that may
process SIP messages are affected. The only requirement for these
vulnerabilities is that the Cisco IOS device processes SIP messages
as part of configured voice over IP (VoIP) functionality (this does
not apply to processing of SIP messages as part of the NAT and
firewall feature sets.) Recent versions of Cisco IOS do not process
SIP messages by default, but creating a "dial peer" via the command
dial-peer voice will start the SIP processes and cause Cisco IOS to
start processing SIP messages. An example of an affected
configuration is as follows:
dial-peer voice <Voice dial-peer tag> voip
...
!
Note that older versions of Cisco IOS were affected by a bug that
caused Cisco IOS to process SIP messages even without being
configured for SIP operation. Please refer to
http://www.cisco.com/warp/public/707/cisco-sa-20070131-sip.shtml
for additional information on Cisco bug ID CSCsb25337.
In addition to inspecting the Cisco IOS device configuration for a
dial-peer command that causes the device to process SIP messages,
administrators can also use some show commands to determine if the
Cisco IOS device is running processes that handle SIP messages, or if
the device is listening on the SIP ports.
The command show processes | include SIP can be used to determine
whether Cisco IOS is running the processes that handle SIP messages.
In the following example, the presence of the processes
CCSIP_UDP_SOCKET and CCSIP_TCP_SOCKET indicates that the Cisco IOS
device is processing SIP messages:
Router#show processes | include SIP
147 Mwe 40F46DF4 12 2 600023468/24000 0
CCSIP_SPI_CONTRO
148 Mwe 40F21244 0 1 0 5524/6000 0 CCSIP_DNS
149 Mwe 40F48254 4 1 400023108/24000 0
CCSIP_UDP_SOCKET
150 Mwe 40F48034 4 1 400023388/24000 0
CCSIP_TCP_SOCKET
Different versions of Cisco IOS have different ways of verifying
whether the Cisco IOS device is listening for SIP messages. The show
ip sockets, show udp, show tcp brief all, and show control-plane host
open-ports commands can be used to determine this, although not all
of these commands work on all IOS releases. Since it is not practical
in this document to provide a list of commands corresponding to the
various releases, users should try the aforementioned commands to
determine which ones work for their device. The following is one
example of one command that shows a router listening on port 5060
(the SIP port):
router#show control-plane host open-ports
Active internet connections (servers and established)
Prot Local Address Foreign Address Service
State
<output removed for brevity>
tcp *:5060 *:0 SIP
LISTEN
<outoput removed for brevity>
udp *:5060 *:0 SIP
LISTEN
In order to determine the software that runs on a Cisco IOS product,
log in to the device and issue the show version command to display
the system banner. Cisco IOS software identifies itself as
"Internetwork Operating System Software" or simply "IOS." On the next
line of output, the image name displays between parentheses, followed
by "Version" and the Cisco IOS release name. Other Cisco devices do
not have the show version command or give different output.
The following example shows output from a device that runs an IOS
image:
router>show version
Cisco IOS Software, 7200 Software (C7200-ADVSECURITYK9-M), Version
12.4(6)T2, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2006 by Cisco Systems, Inc.
Compiled Tue 16-May-06 16:09 by kellythw
<more output removed for brevity>
Additional information on the Cisco IOS release naming conventions
can be found on the document entitled "White Paper: Cisco IOS
Reference Guide", which is available at
http://www.cisco.com/warp/public/620/1.html
Cisco Unified Communications Manager is also affected by some of
these vulnerabilities, although they are tracked by different Cisco
bug IDs. A companion security advisory for Cisco Unified
Communications Manager is available at
http://www.cisco.com/warp/public/707/cisco-sa-20080924-cucm.shtml
Products Confirmed Not Vulnerable
+--------------------------------
The SIP Application Layer Gateway (ALG), which is used by the IOS
Network Address Translation (NAT) and firewall features of Cisco IOS,
is not affected by these vulnerabilities.
Cisco devices that are running Cisco IOS XR are not affected.
With the exception of the Cisco Unified Communications Manager, no
other Cisco products are currently known to be vulnerable to the
issues described in this advisory.
Details
=======
SIP is a popular signaling protocol used to manage voice and video
calls across IP networks such as the Internet. SIP is responsible for
handling all aspects of call setup and termination. Voice and video
are the most popular types of sessions that SIP handles, but the
protocol is flexible to accommodate for other applications that
require call setup and termination. SIP call signaling can use UDP
(port 5060), TCP (port 5060), or TLS (TCP port 5061) as the
underlying transport protocol.
Multiple denial of service vulnerabilities exist in the SIP
implementation in Cisco IOS. In all cases vulnerabilities can be
triggered by processing valid SIP messages.
Memory Leak Vulnerability
+------------------------
CSCse56800 causes a memory leak in affected devices. The memory
leak is caused by the processing of a specific type of valid SIP
messages and may eventually disrupt the availability of all
voice services, even if the Cisco IOS device is still running.
This vulnerability has been assigned Common Vulnerabilities and
Exposures (CVE) ID CVE-2008-3799.
Device Reload Vulnerabilities
+----------------------------
The following vulnerabilities can lead to a reload of the Cisco IOS
device while processing some specific and valid SIP messages:
* CSCsg91306, assigned CVE ID CVE-2008-3800
* CSCsl62609, assigned CVE ID CVE-2008-3801
* CSCsk42759, assigned CVE ID CVE-2008-3802
Vulnerability Scoring Details
=============================
Cisco has provided scores for the vulnerabilities in this advisory
based on the Common Vulnerability Scoring System (CVSS). The CVSS
scoring in this Security Advisory is done in accordance with CVSS
version 2.0.
CVSS is a standards-based scoring method that conveys vulnerability
severity and helps determine urgency and priority of response.
Cisco has provided a base and temporal score. Customers can then
compute environmental scores to assist in determining the impact of
the vulnerability in individual networks.
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 at
http://intellishield.cisco.com/security/alertmanager/cvss
CSCse56800 - SIP-3-BADPAIR register timer expiry causes slow memory
leak
CVSS Base Score - 7.8
Access Vector - Network
Access Complexity - Low
Authentication - None
Confidentiality Impact - None
Integrity Impact - None
Availability Impact - Complete
CVSS Temporal Score - 6.4
Exploitability - Functional
Remediation Level - Official-Fix
Report Confidence - Confirmed
CSCsg91306 - processor pool memory corruption in CCSIP_SPI_CONTROL
CVSS Base Score - 7.8
Access Vector - Network
Access Complexity - Low
Authentication - None
Confidentiality Impact - None
Integrity Impact - None
Availability Impact - Complete
CVSS Temporal Score - 6.4
Exploitability - Functional
Remediation Level - Official-Fix
Report Confidence - Confirmed
CSCsk42759 - Voice Gateway reloads on receiving a valid SIP packet
CVSS Base Score - 7.8
Access Vector - Network
Access Complexity - Low
Authentication - None
Confidentiality Impact - None
Integrity Impact - None
Availability Impact - Complete
CVSS Temporal Score - 6.4
Exploitability - Functional
Remediation Level - Official-Fix
Report Confidence - Confirmed
CSCsl62609 - Router crash due to presence of valid SIP header
CVSS Base Score - 7.8
Access Vector - Network
Access Complexity - Low
Authentication - None
Confidentiality Impact - None
Integrity Impact - None
Availability Impact - Complete
CVSS Temporal Score - 6.4
Exploitability - Functional
Remediation Level - Official-Fix
Report Confidence - Confirmed
Impact
======
Successful exploitation of the vulnerabilities described in this
document may result in a reload of the device. The issue could be
repeatedly exploited to result in an extended Denial Of Service (DoS)
condition.
Software Versions 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) names a Cisco IOS
release train. If a given release train is vulnerable, then the
earliest possible releases that contain the fix (along with the
anticipated date of availability for each, if applicable) are listed
in the "First Fixed Release" column of the table. The "Recommended
Release" column indicates the releases which have fixes for all the
published vulnerabilities at the time of this Advisory. 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. Cisco recommends upgrading to a release equal to or
later than the release in the "Recommended Releases" column of the
table.
+-------------------------------------------------------------------+
| Major | Availability of Repaired Releases |
| Release | |
|------------+------------------------------------------------------|
| Affected | | Recommended |
| 12.0-Based | First Fixed Release | Release |
| Releases | | |
|-------------------------------------------------------------------|
| There are no affected 12.0 based releases |
|-------------------------------------------------------------------|
| Affected | | Recommended |
| 12.1-Based | First Fixed Release | Release |
| Releases | | |
|-------------------------------------------------------------------|
| There are no affected 12.1 based releases |
|-------------------------------------------------------------------|
| Affected | | Recommended |
| 12.2-Based | First Fixed Release | Release |
| Releases | | |
|------------+---------------------------------------+--------------|
| 12.2 | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.2B | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| 12.2BC | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2BW | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| | | 12.2(33)SB2; |
| | | Available on |
| | | 26-SEP-08 |
| 12.2BX | Vulnerable; first fixed in 12.4 | |
| | | 12.4(15)T7 |
| | | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.2BY | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| 12.2BZ | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2CX | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2CY | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| | Vulnerable; migrate to any release in | 12.2(33)SB2; |
| 12.2CZ | 12.2S | Available on |
| | | 26-SEP-08 |
|------------+---------------------------------------+--------------|
| 12.2DA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2DD | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2DX | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2EW | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2EWA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2EX | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2EY | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2EZ | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2FX | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2FY | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2FZ | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2IRB | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2IXA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2IXB | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2IXC | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2IXD | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2IXE | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2IXF | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2IXG | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2JA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2JK | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2MB | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| | Releases prior to 12.2(15)MC2c are | 12.4(15)T7 |
| 12.2MC | vulnerable, release 12.2(15)MC2c and | |
| | later are not vulnerable; first fixed | 12.4(18c) |
| | in 12.4 | |
|------------+---------------------------------------+--------------|
| 12.2S | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SB | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SBC | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SCA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SE | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SEA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SEB | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SEC | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SED | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SEE | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SEF | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SEG | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SG | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SGA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SL | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SM | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SO | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SRA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SRB | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SRC | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SU | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SV | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SVA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SVC | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SVD | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SW | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SX | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SXA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SXB | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SXD | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SXE | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SXF | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SXH | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SY | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2SZ | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.2T | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| 12.2TPC | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.2XA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.2XB | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| 12.2XC | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2XD | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2XE | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2XF | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2XG | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2XH | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2XI | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2XJ | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2XK | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2XL | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.2XM | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| 12.2XN | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2XNA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2XNB | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2XO | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2XQ | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2XR | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2XS | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.2XT | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.2XU | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| 12.2XV | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.2XW | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.2YA | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| 12.2YB | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.2YC | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.2YD | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.2YE | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2YF | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.2YG | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2YH | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.2YJ | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.2YK | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2YL | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.2YM | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| 12.2YN | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.2YO | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2YP | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2YQ | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2YR | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2YS | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2YT | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.2YU | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| | Releases prior to 12.2(11)YV1 are | |
| 12.2YV | vulnerable, release 12.2(11)YV1 and | |
| | later are not vulnerable; | |
|------------+---------------------------------------+--------------|
| 12.2YW | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.2YX | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2YY | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.2YZ | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2ZA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2ZB | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.2ZC | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.2ZD | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.2ZE | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.2ZF | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| 12.2ZG | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.2ZH | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| 12.2ZJ | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.2ZL | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.2ZP | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.2ZU | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2ZX | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2ZY | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.2ZYA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| Affected | | Recommended |
| 12.3-Based | First Fixed Release | Release |
| Releases | | |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.3 | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.3B | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| 12.3BC | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.3BW | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.3EU | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.3JA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.3JEA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.3JEB | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.3JEC | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.3JK | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.3JL | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.3JX | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.3T | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| 12.3TPC | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.3VA | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| | Releases prior to 12.3(2)XA7 are | 12.4(15)T7 |
| 12.3XA | vulnerable, release 12.3(2)XA7 and | |
| | later are not vulnerable; first fixed | 12.4(18c) |
| | in 12.4 | |
|------------+---------------------------------------+--------------|
| 12.3XB | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.3XC | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.3XD | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.3XE | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| 12.3XF | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.3XG | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| | Vulnerable; migrate to any release in | 12.2(33)SB2; |
| 12.3XI | 12.2SB | Available on |
| | | 26-SEP-08 |
|------------+---------------------------------------+--------------|
| | | 12.3(14)YX13 |
| 12.3XJ | Vulnerable; first fixed in 12.3YX | |
| | | 12.4(15)T7 |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.3XK | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.3XL | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.3XQ | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.3XR | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| 12.3XS | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.3XU | Vulnerable; first fixed in 12.4T | 12.4(15)T7 |
|------------+---------------------------------------+--------------|
| | | 12.3(14)YX13 |
| 12.3XW | Vulnerable; first fixed in 12.3YX | |
| | | 12.4(15)T7 |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.3XX | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.3XY | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| | | 12.4(15)T7 |
| 12.3XZ | Vulnerable; first fixed in 12.4 | |
| | | 12.4(18c) |
|------------+---------------------------------------+--------------|
| 12.3YA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.3YD | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| | | 12.3(14)YX13 |
| 12.3YF | Vulnerable; first fixed in 12.3YX | |
| | | 12.4(15)T7 |
|------------+---------------------------------------+--------------|
| 12.3YG | 12.3(8)YG7; Available on 01-OCT-08 | 12.4(15)T7 |
|------------+---------------------------------------+--------------|
| 12.3YH | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.3YI | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.3YJ | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| | Releases prior to 12.3(11)YK3 are | |
| 12.3YK | vulnerable, release 12.3(11)YK3 and | 12.4(15)T7 |
| | later are not vulnerable; first fixed | |
| | in 12.4T | |
|------------+---------------------------------------+--------------|
| | | 12.3(14) |
| 12.3YM | 12.3(14)YM13; Available on 30-SEP-08 | YM13; |
| | | Available on |
| | | 30-SEP-08 |
|------------+---------------------------------------+--------------|
| 12.3YQ | Vulnerable; first fixed in 12.4T | 12.4(15)T7 |
|------------+---------------------------------------+--------------|
| 12.3YS | Vulnerable; first fixed in 12.4T | 12.4(15)T7 |
|------------+---------------------------------------+--------------|
| 12.3YT | Vulnerable; first fixed in 12.4T | 12.4(15)T7 |
|------------+---------------------------------------+--------------|
| | | 12.4(2)XB10 |
| | | |
| 12.3YU | Vulnerable; first fixed in 12.4XB | 12.4(9)XG3 |
| | | |
| | | 12.4(15)T7 |
|------------+---------------------------------------+--------------|
| 12.3YX | 12.3(14)YX12 | 12.3(14)YX13 |
|------------+---------------------------------------+--------------|
| 12.3YZ | 12.3(11)YZ3 | |
|------------+---------------------------------------+--------------|
| 12.3ZA | Vulnerable; first fixed in 12.4T | 12.4(15)T7 |
|------------+---------------------------------------+--------------|
| Affected | | Recommended |
| 12.4-Based | First Fixed Release | Release |
| Releases | | |
|------------+---------------------------------------+--------------|
| | 12.4(13f) | |
| | | |
| 12.4 | 12.4(17b) | 12.4(18c) |
| | | |
| | 12.4(18) | |
|------------+---------------------------------------+--------------|
| 12.4JA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.4JK | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.4JL | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.4JMA | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.4JMB | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.4JMC | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.4JX | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.4MD | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.4MR | 12.4(19)MR | 12.4(19)MR |
|------------+---------------------------------------+--------------|
| 12.4SW | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| | 12.4(15)T4 | |
| | | |
| 12.4T | 12.4(20)T | 12.4(15)T7 |
| | | |
| | 12.4(6)T11 | |
|------------+---------------------------------------+--------------|
| 12.4XA | Vulnerable; first fixed in 12.4T | 12.4(15)T7 |
|------------+---------------------------------------+--------------|
| 12.4XB | 12.4(2)XB10 | 12.4(2)XB10 |
|------------+---------------------------------------+--------------|
| 12.4XC | Vulnerable; first fixed in 12.4T | 12.4(15)T7 |
|------------+---------------------------------------+--------------|
| | | 12.4(4)XD11; |
| 12.4XD | 12.4(4)XD11; Available on 26-SEP-08 | Available on |
| | | 26-SEP-08 |
|------------+---------------------------------------+--------------|
| 12.4XE | Vulnerable; first fixed in 12.4T | 12.4(15)T7 |
|------------+---------------------------------------+--------------|
| 12.4XF | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.4XG | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.4XJ | Vulnerable; first fixed in 12.4T | 12.4(15)T7 |
|------------+---------------------------------------+--------------|
| 12.4XK | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.4XL | 12.4(15)XL2 | 12.4(15)XL2 |
|------------+---------------------------------------+--------------|
| 12.4XM | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.4XN | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.4XP | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.4XQ | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.4XR | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.4XT | Vulnerable; first fixed in 12.4T | 12.4(15)T7 |
|------------+---------------------------------------+--------------|
| 12.4XV | Vulnerable; contact TAC | |
|------------+---------------------------------------+--------------|
| 12.4XW | 12.4(11)XW7 | 12.4(11)XW9 |
|------------+---------------------------------------+--------------|
| 12.4XY | 12.4(15)XY3 | 12.4(15)XY4 |
|------------+---------------------------------------+--------------|
| 12.4XZ | Not Vulnerable | |
|------------+---------------------------------------+--------------|
| 12.4YA | Not Vulnerable | |
+-------------------------------------------------------------------+
Workarounds
===========
If the affected Cisco IOS device needs to provide voice over IP
services and therefore SIP cannot be disabled then none of the listed
vulnerabilities have workarounds. Users are advised to apply
mitigation techniques to limit exposure to the listed
vulnerabilities. Mitigation consists of only allowing legitimate
devices to connect to the routers. To increase effectiveness, the
mitigation must be coupled with anti-spoofing measures on the network
edge. This action is required because SIP can use UDP as the
transport protocol.
Additional mitigations that can be deployed on Cisco devices within
the network are available in the Cisco Applied Mitigation Bulletin
companion document for this advisory, which is available at the
following link:
http://www.cisco.com/warp/public/707/cisco-amb-20080924-sip.shtml
Disable SIP Listening Ports
+--------------------------
For devices that do not require SIP to be enabled, the simplest and
most effective workaround is to disable SIP processing on the device.
Some versions of Cisco IOS allow administrators to accomplish this
with the following commands:
sip-ua
no transport udp
no transport tcp
Warning: When applying this workaround to devices processing
MGCP or H.323 calls, the device will not allow you to stop SIP
processing while active calls are being processed. Under these
circumstances, this workaround should be implemented during a
maintenance window when active calls can be briefly stopped.
It is recommended that after applying this workaround, the show
commands discussed in the Vulnerable Products section be used to
confirm that the Cisco IOS device is no longer processing SIP
messages.
Control Plane Policing
+---------------------
For devices that need to offer SIP services it is possible to use
Control Plane Policing (CoPP) to block SIP traffic to the device from
untrusted sources. Cisco IOS software releases 12.0S, 12.2SX, 12.2S,
12.3T, 12.4, and 12.4T support the CoPP feature. CoPP may be
configured on a device to protect the management and control planes
to minimize the risk and effectiveness of direct infrastructure
attacks by explicitly permitting only authorized traffic sent to
infrastructure devices in accordance with existing security policies
and configurations. The following example can be adapted to your
network:
!-- The 192.168.1.0/24 network and the 172.16.1.1 host are trusted.
!-- Everything else is not trusted. The following access list is used
!-- to determine what traffic needs to be dropped by a control plane
!-- policy (the CoPP feature.) If the access list matches (permit)
!-- then traffic will be dropped and if the access list does not
!-- match (deny) then traffic will be processed by the router.
access-list 100 deny udp 192.168.1.0 0.0.0.255 any eq 5060
access-list 100 deny tcp 192.168.1.0 0.0.0.255 any eq 5060
access-list 100 deny tcp 192.168.1.0 0.0.0.255 any eq 5061
access-list 100 deny udp host 172.16.1.1 any eq 5060
access-list 100 deny tcp host 172.16.1.1 any eq 5060
access-list 100 deny tcp host 172.16.1.1 any eq 5061
access-list 100 permit udp any any eq 5060
access-list 100 permit tcp any any eq 5060
access-list 100 permit tcp any any eq 5061
!-- Permit (Police or Drop)/Deny (Allow) all other Layer3 and Layer4
!-- traffic in accordance with existing security policies and
!-- configurations for traffic that is authorized to be sent
!-- to infrastructure devices.
!-- Create a Class-Map for traffic to be policed by
!-- the CoPP feature.
class-map match-all drop-sip-class
match access-group 100
!-- Create a Policy-Map that will be applied to the
!-- Control-Plane of the device.
policy-map drop-sip-traffic
class drop-sip-class
drop
!-- Apply the Policy-Map to the Control-Plane of the
!-- device.
control-plane
service-policy input drop-sip-traffic
Warning: Because SIP can utilize UDP as a transport protocol,
it is possible to easily spoof the sender's IP address, which may
defeat ACLs that permit communication to these ports from trusted
IP addresses.
In the above CoPP example, the access control list entries (ACEs)
that match the potential 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 (not shown) are
not affected by the policy-map drop function. Additional information
on the configuration and use of the CoPP feature can be found at
http://www.cisco.com/en/US/products/ps6642/products_white_paper0900aecd804fa16a.shtml
and
http://www.cisco.com/en/US/products/sw/iosswrel/ps1838/products_feature_guide09186a008052446b.html
Obtaining Fixed Software
========================
Cisco has released free software updates that address these
vulnerabilities. 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/en/US/products/prod_warranties_item09186a008088e31f.html
or as otherwise set forth at Cisco.com Downloads at
http://www.cisco.com/public/sw-center/sw-usingswc.shtml
Do not contact psirt@xxxxxxxxx or security-alert@xxxxxxxxx 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 agreements 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 do not hold a Cisco
service contract, and customers who purchase through third-party
vendors but are unsuccessful in obtaining fixed software through
their point of sale should acquire 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@xxxxxxxxx
Customers should have their product serial number available and be
prepared to give the URL of this notice as evidence of 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 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.
These vulnerabilities were discovered by Cisco internal testing and
during handling of customer service requests.
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-20080924-sip.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@xxxxxxxxx
* first-bulletins@xxxxxxxxxxxxxxx
* bugtraq@xxxxxxxxxxxxxxxxx
* vulnwatch@xxxxxxxxxxxxx
* cisco@xxxxxxxxxxxxxxxxx
* cisco-nsp@xxxxxxxxxxxxxxx
* full-disclosure@xxxxxxxxxxxxxxxxx
* comp.dcom.sys.cisco@xxxxxxxxxxxxxxxxxx
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
================
+----------------------------------------+
| Revision | | Initial |
| 1.0 | 2008-September-24 | public |
| | | release |
+----------------------------------------+
Cisco Security Procedures
=========================
Complete information on reporting security vulnerabilities in Cisco
products, obtaining assistance with security incidents, and
registering to receive security information from Cisco, is available
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
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