-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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_paper0900aecd804fa... and http://www.cisco.com/en/US/products/sw/iosswrel/ps1838/products_feature_guid... 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.htm... or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml Do not contact 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 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@cisco.com 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@cisco.com * first-bulletins@lists.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 ================ +----------------------------------------+ | 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.h... This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (Darwin) iEYEARECAAYFAkjaLd0ACgkQ86n/Gc8U/uDWJwCdHEe8XwtX0kKmTHf2T6/Nm02U 3N8AnjG1IaW/GWg78gj6k0NGXre3Mggr =4nzw -----END PGP SIGNATURE-----