-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Cisco Security Advisory: Cisco VPN Client Multiple Vulnerabilities
Revision 1.0 For Public Release 2002 August 12 UTC 1500 ---------------------------------------------------------------------- Contents Summary Affected Products Details Impact Software Versions and Fixes Obtaining Fixed Software Workarounds Exploitation and Public Announcements Status of This Notice Distribution Revision History Cisco Security Procedures ---------------------------------------------------------------------- Summary Multiple vulnerabilities exist in the Cisco Virtual Private Network (VPN) Client software. Exploitation of these vulnerabilities prevents the Cisco VPN Client software program from functioning correctly. These vulnerabilities are documented as Cisco bug ID CSCdy26045. There are no workarounds available to mitigate the effects of these vulnerabilities. This advisory will be posted at http://www.cisco.com/warp/public/707/vpnclient-multiple-vuln-pub.shtml. Affected Products The VPN Client software program runs on the following platforms: * Microsoft Windows-based PC. * Red Hat Version 6.2 Linux (Intel), or compatible distribution, using kernel Version 2.2.12 or later. It does not support kernel Version 2.5. * Solaris UltraSPARC running a 32-bit kernel OS Version 2.6 or later. * Mac OS X Version 10.1.0 or later. All VPN Client software programs, earlier than version 3.6 and earlier than version 3.5.4, on all platforms are affected by this vulnerability. This includes the previous Cisco Secure VPN Client and the the Cisco VPN 3000 Client software programs. Cisco VPN 5000 Client software programs are not affected by this vulnerability. No other Cisco product is currently known to be affected by this vulnerability. Details The VPN Client software program on a remote workstation, communicating with a Cisco VPN device on an enterprise network or with a service provider, creates a secure connection over the Internet. Through this connection you can access a private network as if you were an on-site user. The VPN Client software program has been found to have the following vulnerabilities: * An Internet Key Exchange (IKE) packet with a Security Parameter Index (SPI) payload containing more than 16 bytes causes a buffer overflow in the VPN client software. * An IKE packet with more than 57 valid payloads causes a buffer overflow in the VPN Client software. * When the VPN Client software receives a specially crafted packet with a zero length payload, it causes the VPN Client software to use 100% of CPU resources on the workstation. These vulnerabilities are documented as Cisco bug ID CSCdy26045, which requires a CCO account to view. CSCdy26045 can be viewed after 2002 August 13 at 1500 UTC. Impact When the vulnerabilities are exploited they prevent the Cisco VPN Client software program from functioning correctly. The Cisco VPN Client software program's availability may be impacted. There is no impact to the confidentiality and integrity of the data. Software Versions and Fixes This vulnerability has been fixed in Cisco VPN Client version 3.6 or later, which is now available for download. The fix for this vulnerability will also be integrated in VPN Client version 3.5.4 or later, and will be available for download by September 30, 2002. The procedure to upgrade to the fixed software version on the various platforms is detailed in the documentation available at http://www.cisco.com/univercd/cc/td/doc/product/vpn/client/. Obtaining Fixed Software Cisco is offering free software upgrades to address this vulnerability for all affected customers. Customers may only install and expect support for the feature sets they have purchased. Customers with service contracts should contact their regular update channels to obtain the free software upgrade identified via this advisory. For most customers with service contracts, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com/kobayashi/sw-center/. Customers whose Cisco products are provided or maintained through a 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 purchased directly 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 obtain fixed software by contacting the Cisco Technical Assistance Center (TAC) using the contact information listed below. In these cases, customers are entitled to obtain an upgrade to a later version of the same release or as indicated by the applicable corrected software version in the Software Versions and Fixes section (noted above). Cisco 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: [EMAIL PROTECTED] See 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 of this advisory as evidence of your entitlement to a free upgrade. Please do not contact either "[EMAIL PROTECTED]" or "[EMAIL PROTECTED]" for software upgrades. Workarounds There are no workarounds for these vulnerabilities. The Cisco PSIRT recommends that affected users upgrade to a fixed software version of code. Exploitation and Public Announcements The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities described in this advisory. These vulnerabilities were reported to PSIRT by CERT/CC. Status of This Notice: FINAL This is a final notice. 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/vpnclient-multiple-vuln-pub.shtml. In addition to worldwide website posting, a text version of this advisory is clear-signed with the Cisco PSIRT PGP key having the fingerprint FEB1 1B89 A64B 60BB 4770 D1CE 93D2 FF06 F236 759C and is posted to the following e-mail and Usenet news recipients: * [EMAIL PROTECTED] * [EMAIL PROTECTED] * [EMAIL PROTECTED] * [EMAIL PROTECTED] (includes CERT/CC) * [EMAIL PROTECTED] * [EMAIL PROTECTED] * [EMAIL PROTECTED] * comp.dcom.sys.cisco * Various internal Cisco mailing lists 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 1.0 | 2002-August-12 | 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/go/psirt. This includes instructions for press inquiries regarding Cisco security advisories. ---------------------------------------------------------------------- This notice is Copyright 2002 by Cisco Systems, Inc. This notice 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 6.5.8 Comment: Signed by Sharad Ahlawat, Cisco Systems PSIRT iQA/AwUBPVfNdJPS/wbyNnWcEQJKkACg+3XwPw1p0SG9Dll9ilJJjvsn7rsAoMFM 9o5ThNZaNNzEo8WE0S2/NgOY =RpWI -----END PGP SIGNATURE-----