__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Cisco IPv6 Crafted Packet Vulnerability [Cisco Security Advisory Document ID: 65783] July 29, 2005 12:00 GMT Number P-262 [REVISED 29 Jul 2005] [REVISED 01 Aug 2005] [REVISED 02 Aug 2005] [REVISED 03 Aug 2005] [REVISED 05 Aug 2005] ______________________________________________________________________________ PROBLEM: Cisco Internetwork Operating System (IOS) Software is vulnerable to a Denial of Service (DoS) and potentially an arbitrary code execution attack from a specifically crafted IPv6 packet sent from a local network segment. PLATFORM: This issue affects all Cisco devices running any unfixed version of Cisco IOS code that supports, and is configured for, IPv6. A device which supports IPv6 must have the interfaces specifically disabled to not be affected. IPv6 must be completely disabled using both the command no ipv6 address and no ipv6 enable on each interface. DAMAGE: Denial of Service (DoS) and potentially an arbitrary code execution attack from a specifically crafted IPv6 packet. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is HIGH. Vulnerable to a Denial of Service (DoS) and ASSESSMENT: potentially an arbitrary code execution attack from a specifically crafted IPv6 packet. This issue affects all Cisco devices running any unfixed version of Cisco IOS code that supports, and is configured for, IPv6. A device which supports IPv6 must have the interfaces specifically disabled to not be affected. IPv6 must be completely disabled using both the command no ipv6 address and no ipv6 enable on each interface. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/p-262.shtml ORIGINAL BULLETIN: Cisco Security Advisory Document ID: 65783 http://www.cisco.com/en/US/products/products_security_ advisory09186a00804d82c9.shtml ADDITIONAL LINKS: US-CERT Vulnerability Note VU#930892 http://www.kb.cert.org/vuls/id/930892 ISS Security Advisory http://xforce.iss.net/xforce/alerts/id/201 ______________________________________________________________________________ REVISION HISTORY: 07/29/2005 - updated Cisco Advisory to reflect changes to Software Versions and Fixes table and change to paragraph in the Vulnerable Products section. Also added link to US-CERT VU#930892 and ISS X-Force Advisory. 08/01/2005 - updated Cisco Advisory: - Revision 1.2 IOS XR added to Affected Products. Wording changes made in the Workarounds section. Software Versions and Fixes table updated. - Revision 1.3 Software Versions and Fixes table updated. - Revision 1.4 Software Versions and Fixes table updated for 12.2BC, 12.2EZ, 12.2SEB, and 12.2SW. 08/02/2005 - updated Cisco Advisory: - Revision 1.5 - Software Versions and Fixes table updated for 12.2JK, 12.2MC, 12.2ZD, 12.3XA, 12.3XE, 12.3XG, and 12.3XK; removed 12.2CZ. 08/03/2005 - updated Cisco Advisory: - Revision 1.6 - Added a note to the Affected Products section. Software Versions and Fixes table updated for 12.2EZ. 08/05/2005 – updated Cisco Advisory: - Revision 1.7 - Software Versions and Fixes table updated for Cisco IOS XR. [***** Start Cisco Security Advisory Document ID: 65783 *****] Cisco Security Advisory: IPv6 Crafted Packet Vulnerability Revision 1.7 Last Updated 2005 August 05 1450 UTC For Public Release 2005 July 29 0800 UTC -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- Contents Summary Affected Products Details Impact Software Versions and Fixes Obtaining Fixed Software Workarounds Exploitation and Public Announcements Status of This Notice: INTERIM Distribution Revision History Cisco Security Procedures -------------------------------------------------------------------------------- Summary Cisco Internetwork Operating System (IOS®) Software is vulnerable to a Denial of Service (DoS) and potentially an arbitrary code execution attack from a specifically crafted IPv6 packet. The packet must be sent from a local network segment. Only devices that have been explicitly configured to process IPv6 traffic are affected. Upon successful exploitation, the device may reload or be open to further exploitation. Cisco has made free software available to address this vulnerability for all affected customers. This advisory will be posted at http://www.cisco.com/warp/public/707/cisco-sa-20050729-ipv6.shtml. Affected Products Vulnerable Products This issue affects all Cisco devices running any unfixed version of Cisco IOS or Cisco IOS XR code that supports, and is configured for, IPv6. A system which supports IPv6, if not specifically configured for IPv6, is not affected. You can use the show ipv6 interface command to determine whether IPv6 is enabled on a system. Sample output of the show ipv6 interface command is shown below for two systems, one not configured for IPv6 and one configured for IPv6. An empty output or an error message will be displayed if IPv6 is disabled or unsupported on the system. Router#show ipv6 int fa 0/0 -here you see blank outputIn the example below the system is vulnerable. Router#show ipv6 interface Serial1/0 is up, line protocol is up IPv6 is enabled, link-local address is FE80::A8BB:CCFF:FE00:D200 Global unicast address(es): 2001:1:33::3, subnet is 2001:1:33::/64 Joined group address(es): FF02::1 FF02::1:FF00:3 FF02::1:FF00:D200 MTU is 1500 bytes ICMP error messages limited to one every 100 milliseconds ICMP redirects are enabled ND DAD is enabled, number of DAD attempts: 1 ND reachable time is 30000 milliseconds Router# A router that has IPv6 enabled on a physical or logical interface is vulnerable to this issue even if ipv6 unicast-routing is globally disabled. The show ipv6 interface command can be used to determine whether IPv6 is enabled on any interface. Note: Cisco 6500 and 7600 series systems that run 12.2(17a)SX, 12.2(17b)SXA or 12.2(17d)SXB based images automatically enable IPv6 on interfaces where Multi Protocol Label Switching (MPLS) is enabled. MPLS is enabled on an interface by the mpls ip or tag-switching ip commands. You can use the show ipv6 interface command to determine whether IPv6 is enabled on any interface. To determine the software running on a Cisco product, log in to the device and issue the show version command to display the system banner. Cisco IOS Software will identify itself as "Internetwork Operating System Software" or simply "IOS." On the next line of output, the image name will be displayed between parentheses, followed by "Version" and the IOS release name. Other Cisco devices will not have the show version command or will give different output. The following example shows a product running IOS release 12.3(6) with an image name of C2600-JS-MZ: Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-JS-MZ), Version 12.3(6), RELEASE SOFTWARE (fc1) Additional information about Cisco IOS release naming can be found at http://www.cisco.com/warp/public/620/1.html. A system that is running a Cisco IOS XR version prior to 3.2 is also affected by this vulnerability if configured for IPv6. The show ipv6 interface command can be used to identify whether IPv6 is enabled on a system running Cisco IOS XR. Products Confirmed Not Vulnerable Products that are not running Cisco IOS or Cisco IOS XR are not affected. Products running any version of Cisco IOS that do not have IPv6 configured interfaces are not vulnerable. No other Cisco products are currently known to be affected by these vulnerabilities. Details IPv6 is the "Internet Protocol Version 6", designed by the Internet Engineering Task Force (IETF) to replace the current version Internet Protocol, IP Version 4 (IPv4). A vulnerability exists in the processing of IPv6 packets. Crafted packets from the local segment received on logical interfaces (that is, tunnels including 6to4 tunnels) as well as physical interfaces can trigger this vulnerability. Crafted packets can not traverse a 6to4 tunnel and attack a box across the tunnel. The crafted packet must be sent from a local network segment to trigger the attack. This vulnerability can not be exploited one or more hops from the IOS device. This issue is documented in Cisco bug ID CSCef68324 ( registered customers only) for Cisco IOS, and CSCeh74956 ( registered customers only) for Cisco IOS XR. Impact Successful exploitation of the vulnerability on Cisco IOS may result in a reload of the device or execution of arbitrary code. Repeated exploitation could result in a sustained DoS attack or execution of arbitrary code on Cisco IOS devices. Successful exploitation of the vulnerability on Cisco IOS-XR may result in a restart of the IPv6 neighbor discovery process. A restart of this process will only affect IPv6 traffic passing through the system. All other processes and traffic will be unaffected. Repeated exploitation could result in a sustained DoS attack on IPv6 traffic. Software Versions and Fixes Each row of the Cisco IOS software table below describes a release train and the platforms or products for which it is intended. If a given release train is vulnerable, then the earliest possible releases that contain the fix (the First Fixed Release) and the anticipated date of availability for each are listed in the Rebuild and Maintenance columns. 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. The release should be upgraded at least to the indicated release or a later version (greater than or equal to the First Fixed Release label). Major Release Availability of Repaired Releases Affected 12.0-Based Release Rebuild Maintenance 12.0S 12.0(26)S6 12.0(27)S5 12.0(28)S3 12.0(30)S2 12.0(31)S 12.0SL Vulnerable; migrate to 12.0(31)S or later 12.0ST Vulnerable; migrate to 12.0(31)S or later 12.0SY Vulnerable; migrate to 12.0(31)S or later Affected 12.1-Based Release Rebuild Maintenance 12.1XU Vulnerable; migrate to 12.3(15) or later 12.1XV Vulnerable; migrate to 12.3(15) or later 12.1YB Vulnerable; migrate to 12.3(15) or later 12.1YC Vulnerable; migrate to 12.3(15) or later 12.1YD Vulnerable; migrate to 12.3(15) or later 12.1YE Vulnerable; migrate to 12.3(15) or later 12.1YF Vulnerable; migrate to 12.3(15) or later 12.1YH Vulnerable; migrate to 12.3(15) or later 12.1YI Vulnerable; migrate to 12.3(15) or later Affected 12.2-Based Release Rebuild Maintenance 12.2B Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2BC 12.2(15)BC2h 12.2BW Vulnerable; migrate to 12.3(15) or later 12.2BY Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2BX Vulnerable; migrate to 12.3(7)XI4 or later 12.2BZ Vulnerable; migrate to 12.3(7)XI4 or later 12.2CX Vulnerable; migrate to 12.3(13a)BC or later 12.2CY Vulnerable; migrate to 12.3(13a)BC or later 12.2DD Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2DX Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2EU 12.2(20)EU1 12.2EW 12.2(20)EW2 12.2EWA 12.2(20)EWA2 12.2(25)EWA1 12.2EZ 12.2(25)EZ1 12.2JA Vulnerable; migrate to 12.3(4)JA or later 12.2JK 12.2(15)JK4 12.2MB 12.2(4)MB13b 12.2MC 12.2(15)MC2c 12.2(15)MC1c is vulnerable; migrate to 12.4(2)MR 12.2MX Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2S 12.2(14)S14 12.2(18)S9 12.2(20)S8 12.2(25)S4 12.2SEB 12.2(25)SEB3 12.2SEC 12.2(25)SEC1 12.2SO Vulnerable; contact TAC 12.2SU Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2SV 12.2(18)SV3, 12.2(22)SV1, 12.2(23)SV1, 12.2(24)SV1, 12.2(25)SV2 12.2(26)SV 12.2SW 12.2(25)SW3a 12.2SX Vulnerable; migrate to 12.2(17d)SXB8 or later 12.2SXA Vulnerable; migrate to 12.2(17d)SXB8 or later 12.2SXB 12.2(17d)SXB8 12.2SXD 12.2(18)SXD4 12.2SXE 12.2(18)SXE1 12.2SY Vulnerable; migrate to 12.2(17d)SXB8 or later 12.2SZ Vulnerable; migrate to 12.2(20)S8 or later 12.2T 12.2(13)T16 12.2(15)T16 12.2XA Vulnerable; migrate to 12.3(15) or later 12.2XB Vulnerable; migrate to 12.3(15) or later 12.2XC Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2XD Vulnerable; migrate to 12.3(15) or later 12.2XE Vulnerable; migrate to 12.3(15) or later 12.2XF Vulnerable; migrate to 12.3(13a)BC or later 12.2XG Vulnerable; migrate to 12.3(15) or later 12.2XH Vulnerable; migrate to 12.3(15) or later 12.2XI Vulnerable; migrate to 12.3(15) or later 12.2XJ Vulnerable; migrate to 12.3(15) or later 12.2XK Vulnerable; migrate to 12.3(15) or later 12.2XL Vulnerable; migrate to 12.3(15) or later 12.2XM Vulnerable; migrate to 12.3(15) or later 12.2XN Vulnerable; migrate to 12.3(15) or later 12.2XQ Vulnerable; migrate to 12.3(15) or later 12.2XR Vulnerable; migrate to 12.3(4)JA or later 12.2XT Vulnerable; migrate to 12.3(15) or later 12.2XU Vulnerable; migrate to 12.3(15) or later 12.2XW Vulnerable; migrate to 12.3(15) or later 12.2XZ Vulnerable; migrate to 12.3(15) or later 12.2YA 12.2(4)YA10 12.2YB Vulnerable; migrate to 12.3(15) or later 12.2YC Vulnerable; migrate to 12.3(15) or later 12.2YD Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2YE Vulnerable; migrate to 12.2(25)S4 or later 12.2YF Vulnerable; migrate to 12.3(15) or later 12.2YG Vulnerable; migrate to 12.3(15) or later 12.2YH Vulnerable; migrate to 12.3(15) or later 12.2YJ Vulnerable; migrate to 12.3(15) or later 12.2YK Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2YL Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2YM Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2YN Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2YO Vulnerable; migrate to 12.2(17d)SXB8 or later 12.2YP Vulnerable; migrate to 12.3(15) or later 12.2YQ Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2YR Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2YT Vulnerable; migrate to 12.2(15)T16 or later 12.2YU Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2YV Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2YW Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2YX Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2YY Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2YZ Vulnerable; migrate to 12.2(20)S8 or later 12.2ZA Vulnerable; migrate to 12.2(17d)SXB8 or later 12.2ZB Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2ZC Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2ZD 12.2(13)ZD3 12.2ZE Vulnerable; migrate to 12.3(15) or later 12.2ZF Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2ZG Vulnerable; contact TAC 12.2ZH Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2ZJ Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2ZL Vulnerable; contact TAC 12.2ZN Vulnerable; migrate to fixed 12.3(14)T2 or later 12.2ZO Vulnerable; migrate to 12.2(15)T16 or later 12.2ZP Vulnerable; migrate to 12.3(8)XY6 or later Affected 12.3-Based Release Rebuild Maintenance 12.3 12.3(3h) 12.3(5e) 12.3(6e) 12.3(9d) 12.3(10d) 12.3(12b) 12.3(13a) 12.3(15) 12.3B 12.3(5a)B5 12.3BC 12.3(9a)BC6 12.3(13a)BC 12.3BW Vulnerable; migrate to fixed 12.3(14)T2 or later 12.3JA 12.3(4)JA 12.3JK 12.3(2)JK 12.3T 12.3(7)T9 12.3(8)T8 12.3(11)T5 12.3(14)T2 12.3XA 12.3(2)XA4 12.3XB Vulnerable; migrate to fixed 12.3(14)T2 or later 12.3XC 12.3(2)XC3 12.3XD Vulnerable; contact TAC 12.3XE 12.3(2)XE3 12.3XF Vulnerable; migrate to fixed 12.3(14)T2 or later 12.3XG 12.3(4)XG4 12.3XH Vulnerable; migrate to fixed 12.3(14)T2 or later 12.3XI 12.3(7)XI4 12.3XJ Vulnerable; migrate to 12.3(11)YF3 or later 12.3XK 12.3(4)XK3 12.3XL Vulnerable; contact TAC 12.3XM Vulnerable; migrate to fixed 12.3(14)T2 or later 12.3XQ 12.3(4)XQ1 12.3XR 12.3(7)XR4 12.3XS Vulnerable; migrate to 12.4(1) or later 12.3XT Vulnerable; contact TAC 12.3XU Vulnerable; migrate to 12.4(2)T or later 12.3XW Vulnerable; migrate to 12.3(11)YF3 or later 12.3XX Vulnerable; migrate to 12.4(1) or later 12.3XY 12.3(8)XY6 12.3YA 12.3(8)YA1 12.3YD Vulnerable; migrate to 12.4(2)T 12.3YF 12.3(11)YF3 12.3YG 12.3(8)YG2 12.3YH Vulnerable; migrate to 12.3(8)YI1 or later 12.3YI 12.3(8)YI1 12.3YJ 12.3(11)YJ 12.3YK Vulnerable; contact TAC 12.3YQ 12.3(14)YQ1 12.3YS 12.3(11)YS 12.3YT 12.3(14)YT 12.3YU 12.3(14)YU Affected 12.4-Based Release Rebuild Maintenance 12.4 12.4(1) 12.4MR 12.4(2)MR 12.4T 12.4(2)T Product First Fixed Release Cisco IOS XR IOS XR 3.2 Contact TAC to obtain SMU AA01233 for IOS XR 3.0.1. Contact TAC to obtain SMU AA01234 for IOS XR 3.1.0. For further information on the terms "Rebuild" and "Maintenance, " please consult the following URL: http://www.cisco.com/warp/public/620/1.html When considering software upgrades, please also consult http://www.cisco.com/en/US/products/products_security_advisories_listing.html 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") for assistance. Obtaining Fixed Software 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 agreement with third-party support organizations such as Cisco Partners, authorized resellers, or service providers should contact that support organization for assistance with the upgrade, which should be free of charge. Customers without Service Contracts 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) e-mail: tac@cisco.com Please have your product serial number available and give the URL of this notice 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 "psirt@cisco.com" or "security-alert@cisco.com" for software upgrades. 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. 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/public/sw-license-agreement.html, or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml. Workarounds The effectiveness of any workaround 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 is the most appropriate for use in the intended network before it is deployed. In networks where IPv6 is not needed but enabled, disabling IPv6 processing on an IOS device will eliminate exposure to this vulnerability. On a router which is configured for IPv6, this must be done by issuing the command no ipv6 enable and no ipv6 address on each interface. Exploitation and Public Announcements This vulnerability was disclosed on July 27, 2005 at the Black Hat security conference. Status of This Notice: INTERIM THIS ADVISORY IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE ADVISORY OR MATERIALS LINKED FROM THE ADVISORY IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS NOTICE AT ANY TIME. CISCO EXPECTS TO UPDATE THIS NOTICE WITHIN SIX WEEKS FROM THE ORIGINAL DATE OF THIS NOTICE. > 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/cisco-sa-20050729-ipv6.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-teams@first.org (includes CERT/CC) 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 1.7 2005-August-05 Software Versions and Fixes table updated for Cisco IOS XR. Revision 1.6 2005-August-03 Added a note to the Affected Products section. Software Versions and Fixes table updated for 12.2EZ. Revision 1.5 2005-August-02 Software Versions and Fixes table updated for 12.2JK, 12.2MC, 12.2ZD, 12.3XA, 12.3XE, 12.3XG, and 12.3XK; removed 12.2CZ. Revision 1.4 2005-August-01 Software Versions and Fixes table updated for 12.2BC, 12.2EZ, 12.2SEB, and 12.2SW. Revision 1.3 2005-July-31 Software Versions and Fixes table updated. Revision 1.2 2005-July-30 IOS XR added to Affected Products. Wording changes made in the Workarounds section. Software Versions and Fixes table updated. Revision 1.1 2005-July-29 Software Versions and Fixes table updated. First paragraph in the Vulnerable Products section updated. Revision 1.0 2005-July-29 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/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. -------------------------------------------------------------------------------- Updated: Aug 05, 2005 Document ID: 65783 [***** End Cisco Security Advisory Document ID: 65783 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Cisco for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. 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