-----BEGIN PGP SIGNED MESSAGE----- Cisco Security Advisory: OSM Line Card Header Corruption Vulnerability ======================================================================== Revision 1.0 FINAL For Public Release 2002 December 11 16:00 UTC - ------------------------------------------------------------------------ Contents ======== Summary Affected Products Details Impact Software Versions and Fixes Obtaining Fixed Software Workarounds Exploitation and Public Announcements Status of This Advisory Distribution Revision History Cisco Security Procedures - ------------------------------------------------------------------------ Summary ======= The Optical Service Module (OSM) Line Cards installed in Catalyst 6500 or Cisco 7600 chassis, and running Cisco IOSŪ Software Version 12.1(8)E and higher are vulnerable to a Denial of Service upon receiving a specifically constructed or corrupted packet from the local network. Cisco has provided fixed software for this problem. The vulnerability has been assigned Cisco Bug ID CSCdy29717. The complete advisory will be available at http://www.cisco.com/warp/public/707/osm-lc-ios-pkt-vuln-pub.shtml. Affected Products ================= The following products are affected only when they have OSM Line Cards installed and running in conjunction with Cisco IOS Software Versions 12.1(8)E through 12.1(13.4)E: * Catalyst 6500 with Sup2/MSFC2 modules * Cisco 7600 No other releases of Cisco Catalyst hardware and software combinations are affected by this vulnerability. No other Cisco products are affected by this vulnerability. Details ======= This defect was introduced by CSCdv23236 in version Cisco IOS Software Versions 12.1(8)E. When certain malformed datagrams arrive on the interface, the packet forwarding engine specific to this line card rewrites the datagram in such a way that legitimate information is overwritten resulting in the interface ceasing to receive and forward further legitimate network traffic. Because most networking devices typically drop the malformed datagrams, the attack must occur from a locally attached network. Bug ID CSCdy29717 - Traffic forwarding stops due to packet header corruption. Impact ====== This defect causes traffic forwarding to fail, resulting in a denial of service. This can only be triggered from the local network and is not propagated across networks by most layer 3 devices. Software Versions and Fixes =========================== This vulnerability is repaired in version 12.1(13.5)E, and is available for general download in version 12.1(13)E1 and 12.1(12c)E2, and will be available going forward in all versions supporting this hardware combination, specifically 12.1(14)E. The 12.2S train is not affected by this vulnerability, as this particular hardware combination is not currently supported with the 12.2S software. Obtaining Fixed Software ======================== 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/public/sw-center/sw-ios.shtml . Customers whose Cisco products are provided or maintained through prior or existing agreement with third-party support organizations such as Cisco Partners, authorized resellers, or service providers should contact that support organization for assistance with obtaining the free software upgrade(s). Customers who purchase direct from Cisco but who do not hold a Cisco service contract and customers who purchase through third-party vendors but are unsuccessful at obtaining fixed software through their point of sale should get their upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows: * +1 800 553 2447 (toll-free from within North America) * +1 408 526 7209 (toll call from anywhere in the world) * email: tacat_private <mailto:tacat_private> . See http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml <http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml> for additional TAC contact information, including special localized telephone numbers and instructions and e-mail addresses for use in various languages. Please have your product serial number available and give the URL <http://www.cisco.com/warp/public/707/osm-lc-ios-pkt-vuln-pub.shtml> of this advisory as evidence of your entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC. Please do not contact either "psirtat_private" or "security-alertat_private" for software upgrades. Workarounds =========== No workarounds exist for this vulnerability. Cisco recommends upgrading to repaired versions. Exploitation and Public Announcements ===================================== The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory. Status of This Advisory: FINAL ============================== This is a final advisory. Although Cisco cannot guarantee the accuracy of all statements in this advisory, all of the facts have been checked to the best of our ability. Cisco does not anticipate issuing updated versions of this advisory unless there is some material change in the facts. Should there be a significant change in the facts, Cisco may update this advisory. A stand-alone copy or paraphrase of the text of this security advisory 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 will be posted on Cisco's worldwide website at http://www.cisco.com/warp/public/707/osm-lc-ios-pkt-vuln-pub.shtml <http://www.cisco.com/warp/public/707/osm-lc-ios-pkt-vuln-pub.shtml>. In addition to worldwide web posting, a text version of this advisory is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients: * cust-security-announceat_private * bugtraqat_private * full-disclosureat_private * first-teamsat_private (includes CERT/CC) * ciscoat_private * cisco-nspat_private * comp.dcom.sys.cisco * Various internal Cisco mailing lists Future updates of this advisory, if any, will be placed on Cisco's worldwide web Users concerned about this problem are encouraged to check the URL given above for any updates. Revision History ================ Revision 1.0 2002-Dec-11 Initial 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/warp/public/707/sec_incident_response.shtml <http://www.cisco.com/warp/public/707/sec_incident_response.shtml>. This includes instructions for press inquiries regarding Cisco security advisories. All Cisco Security Advisories are available at http://www.cisco.com/go/psirt <http://www.cisco.com/go/psirt>. - ------------------------------------------------------------------------ This advisory is Copyright 2002 by Cisco Systems, Inc. This advisory may be redistributed freely after the release date given at the top of the text, provided that redistributed copies are complete and unmodified, and include all date and version information. - ------------------------------------------------------------------------ -----BEGIN PGP SIGNATURE----- Version: PGP 7.0 iQEVAwUBPfdpkw/VLJ+budTTAQGpzwf9GTjTRt0B0qc/kYBoMSjy1/HrqQnOGkHN W37vXB92JI8IEXqlWstGBqJZ6/GsxUoGjqiPW0oN1Q+SuHOHae0h8K5IHBdq25f+ jQAmNwE5XyBWTFAF3SA6vIBhtWLod/X9K3TPcm73F3jRe75x3Uzkv9LElm7oBY9r 4C3/zXy3a8nIDHkRaS5NoANjNGWxaBJuAMbmar6aGXNfNEjWgfk6Iv+Ix3+Q9Iap m7/SLJl7X4XpqjE5tf6fz726iGoMQKUIwgZqIh3cBvg7sIHdqm3c0iUnknxVI5Ru CpbdHCuJbm0Ah+kAZeKsU6Qd6FR3A0waUxoAsTi0fT/+FR3/wHFRqg== =l6bO -----END PGP SIGNATURE-----
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