From psirt@cisco.com Wed Nov 5 03:00:23 2003 From: Cisco Systems Product Security Incident Response Team To: cust-security-announce@cisco.com Cc: psirt@cisco.com Date: Tue, 4 Nov 2003 9:21:35 -0800 Subject: Cisco Security Advisory: SSL Implementation Vulnerabilities - Revision 2 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Cisco Security Advisory: SSL Implementation Vulnerabilities Revision 2.0 Last Updated 2003 November 04 at 1200 GMT For Public Release 2003 September 30 at 2330 GMT For Public Re-Release 2003 November 04 at 1200 GMT ---------------------------------------------------------------------- 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 On September 30, 2003 new vulnerabilities in the OpenSSL implementation for SSL were announced. This is referred to as the "first" vulnerability in this document. On Novemeber 04, 2003 another vulnerability in the OpenSSL implementation for SSL, version 0.9.6, was announced. This is referred to as the "second" vulnerability in this document. An affected network device running an SSL server based on an affected OpenSSL implementation may be vulnerable to a Denial of Service (DoS) attack when presented with a malformed certificate by a client. The network device may be vulnerable to this vulnerability even if it is configured to not authenticate certificates from the client. There are workarounds available to mitigate the effects of these vulnerabilities. This advisory will be posted at http://www.cisco.com/warp/public/707/cisco-sa-20030930-ssl.shtml . Affected Products The following products have their SSL implementation based on the OpenSSL code and may be affected by the OpenSSL vulnerabilities. * Cisco IOS 12.1(11)E and later in the 12.1E release train Note: Only crypto images (56i and k2) are vulnerable for the Cisco 7100 and 7200 Series Routers. * Cisco IOS 12.2SX and 12.2SY release trains Note: Only crypto images (k8, k9 and k91) are vulnerable for the Cisco Catalyst 6500 Series and Cisco 7600 Series Routers. * Cisco PIX Firewall * Cisco Firewall Services Module (FWSM) for the Cisco Catalyst 6500 Series and Cisco 7600 Series routers * Cisco Network Analysis Modules (NAM) for the Cisco Catalyst 6000 and 6500 Series switches and Cisco 7600 Series routers * Cisco Content Service Switch (CSS) 11000 series * Cisco Content Service Switch (CSS) Secure Content Accelerator versions 1 & 2 * Cisco Threat Response (CTR) * Cisco Global Site Selector (GSS) 4480 * Cisco Application & Content Networking Software (ACNS) * Cisco SN 5428 Storage Router * CiscoWorks 1105 Hosting Solution Engine (HSE) * CiscoWorks 1105 Wireless LAN Solution Engine (WLSE) * CiscoWorks Common Services (CMF) * Cisco SIP Proxy Server (SPS) - only vulnerable to the first vulnerability. * Cisco Secure Policy Manager (CSPM) - only vulnerable to the first vulnerability. The following products, which implement SSL, are currently known to be not vulnerable to the OpenSSL vulnerabilities. * Cisco VPN 3000 Series Concentrators * Cisco Secure Intrusion Detection System (NetRanger) appliance. This includes the IDS-42xx appliances, NM-CIDS and WS-SVS-IDSM2. * Cisco Secure Socket Layer (SSL) Services Module for the Cisco Catalyst 6500 Series and Cisco 7600 Series routers * Cisco Call Manager CatOS does not implement SSL and is not vulnerable. No other Cisco products are currently known to be affected by these vulnerabilities. Details An affected network device running an SSL server based on the OpenSSL implementation may be vulnerable to a Denial of Service (DoS) attack when presented with a malformed certificate by a client. The network device is vulnerable to this vulnerability even if it is configured to not authenticate certificates from the client. More information on the first set of OpenSSL vulnerabilities is available at http://www.openssl.org/news/secadv_20030930.txt . This is referred to as the "first" vulnerability in this document. More information on the second OpenSSL vulnerability is available at http://www.openssl.org/news/secadv_20031104.txt . This is referred to as the "second" vulnerability in this document. * Cisco IOS - All 12.1(11)E and later IOS software releases in the 12.1E release train for the Cisco 7100 and 7200 Series Routers are affected by the OpenSSL vulnerabilities. Please note that only crypto images (56i and k2) are vulnerable. All IOS software releases in the 12.2SX and 12.2SY release trains for the Cisco Catalyst 6500 Series and Cisco 7600 Series Routers are affected by the OpenSSL vulnerabilities. Please note that only crypto images (k8, k9 and k91) are vulnerable. The first vulnerability is documented as Bug ID CSCec46274 (registered customers only) . The HTTPS web service on the device is disabled by default. The command no ip http secure-server may be used to disable the HTTPS web service on the device, if required. The SSH and IPSec services in IOS are not vulnerable to these OpenSSL vulnerabilities. * Cisco PIX Firewall - PIX 5.x does not contain any SSL code and is not vulnerable. The first vulnerability is documented as Bug ID CSCec31274 (registered customers only) and the second vulnerability as Bug ID CSCec69386 (registered customers only) . * Cisco Firewall Services Module (FWSM) - The first vulnerability is documented as Bug ID CSCec45573 (registered customers only) . * Cisco Network Analysis Modules (NAM) - The first vulnerability is documented as Bug ID CSCec44573 (registered customers only) . * Cisco Content Service Switch (CSS) 11000 series - Cisco WebNS versions 6.x and 7.x are vulnerable. WebNS version 5.x is not vulnerable to the OpenSSL vulnerabilities. SCM is also affected. The first vulnerability is documented as Bug IDs CSCec45165 (registered customers only) and CSCec45342 (registered customers only) . * Cisco Content Service Switch (CSS) Secure Content Accelerator versions 1 & 2 - The first vulnerability is documented as Bug ID CSCec48769 (registered customers only) . * Cisco Threat Response (CTR) - The first vulnerability is documented as Bug IDs CSCec46555 (registered customers only) and CSCec45342 (registered customers only) . * Cisco Global Site Selector (GSS) 4480 - The first vulnerability is documented as Bug ID CSCec45380 (registered customers only) . * Cisco Application & Content Networking Software (ACNS) - The first vulnerability is documented as Bug ID CSCec41413 (registered customers only) . * Cisco SN 5428 Storage Router - The first vulnerability is documented as Bug ID CSCec44103 (registered customers only) and the second vulnerability as Bug ID CSCec69147 (registered customers only) . * CiscoWorks 1105 Hosting Solution Engine (HSE) - The first vulnerability is documented as Bug ID CSCec38542 (registered customers only) and CSCec50647 (registered customers only) . * CiscoWorks 1105 Wireless LAN Solution Engine (WLSE) - The first vulnerability is documented as Bug ID CSCec38526 (registered customers only) . * CiscoWorks Common Services (CMF) - Both Solaris and Windows version of CMF 2.2 and CMF 2.1 are vulnerable. Windows versions of Core 1.0 are also vulnerable. The first vulnerability is documented as Bug ID CSCec43722 (registered customers only) . * Cisco SIP Proxy Server (SPS) - Only vulnerable to the first vulnerability. The first vulnerability is documented as Bug ID CSCec31901 (registered customers only) . * Cisco Secure Policy Manager (CSPM) - Only vulnerable to the first vulnerability. The first vulnerability is documented as Bug ID CSCec61390 (registered customers only) . Impact An affected network device running an SSL server based on the OpenSSL implementation may be vulnerable to a Denial of Service (DoS) attack when presented with a malformed certificate by a client regardless of whether it is configured to process client certificates or not. Software Versions and Fixes * Cisco IOS - Fixed Software release TBD. CCO availability TBD. * Cisco PIX Firewall - The first vulnerability is fixed in software release 6.3(3.102). The second vulnerability is fixed in software release 6.3(3.109). CCO availability TBD. * Cisco Firewall Services Module (FWSM) - Fixed Software release TBD. CCO availability TBD. * Cisco Network Analysis Modules (NAM) - The first vulnerability is fixed in software release 3.1 patch 2. Available via CCO download. * Cisco Content Service Switch (CSS) 11000 series - Fixed Software release TBD. CCO availability TBD. * Cisco Content Service Switch (CSS) Secure Content Accelerator versions 1 & 2 - The first vulnerability is fixed in software release 4.2.0.19. CCO availability October 15, 2003. * Cisco Threat Response (CTR) - The first vulnerability is fixed in software release 2.0(2). CCO availability October 13, 2003. * Cisco Global Site Selector (GSS) 4480 - Fixed Software release TBD. CCO availability TBD. * Cisco Application & Content Networking Software (ACNS) - The first vulnerability is fixed in software release 5.0.7. CCO availability September 30, 2003. * Cisco SN 5428 Storage Router - The first vulnerability is fixed in software release 3.4(1) and later. The second vulnerability is fixed in software release 3.4(1.6) and later. Fixed Software version for both will be 3.4(2). CCO availability TBD. * CiscoWorks 1105 Hosting Solution Engine (HSE) - The first vulnerability is fixed in software release 1.7.3. CCO availability November 21, 2003. * CiscoWorks 1105 Wireless LAN Solution Engine (WLSE) - The first vulnerability is fixed in software release 2.5. CCO availability TBD. * CiscoWorks Common Services (CMF) - Fixed Software release TBD. CCO availability TBD. * Cisco SIP Proxy Server (SPS) - The first vulnerability is fixed in software release 2.2. CCO availability TBD. * Cisco Secure Policy Manager (CSPM) - Fixed Software release TBD. CCO availability TBD. Obtaining Fixed Software Cisco is offering free software upgrades or patches to address these vulnerabilities for all affected customers. Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades or patches, 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 the Cisco Connection Online Software Center at http://www.cisco.com/public/sw-center/sw-usingswc.shtml . Customers with service contracts should contact their regular update channels to obtain the free software upgrade(s) or patches 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/tacpage/sw-center/ . To access the software download URL, you must be a registered user and you must be logged in. 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). 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 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 notice as evidence of your entitlement to a free upgrade. Please do not contact either "psirt@cisco.com" or "security-alert@cisco.com" for software upgrades. Workarounds The Cisco PSIRT recommends that affected users upgrade to a fixed software version of code as soon as it is available. * Restrict access to the HTTPS server on the network device: Allow access to the network device only from trusted workstations by using ACL's / MAC filters that are available on the affected platforms. * Disable the SSL server / service on the network device. This workaround must be weighed against the need for secure communications with the vulnerable device. Cisco SIP Proxy Server (SPS) - Disable SSL/TLS functionality: One can do this using the Provisioning GUI. Log in, then select Farm/Proxies from the Configuration options. Select Advanced, and then the SIP Server Core tab. Turn the Enable TLS directive to Off. Exploitation and Public Announcements The Cisco PSIRT is not aware of any malicious use of the vulnerabilities described in this advisory at this time. The first set of vulnerabilities have also been documented by the NISCC at http://www.uniras.gov.uk/vuls/2003/006489/openssl.htm and the second one at http://www.uniras.gov.uk/vuls/2003/006489/openssl2.htm . Status of This Notice: INTERIM This is a interim 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/cisco-sa-20030930-ssl.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 8C82 5207 0CA9 ED40 1DD2 EE2A 7B31 A8CF 32B6 B590 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.netsys.com * 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| |Added information on| |2.0 |2003-04-Nov |second OpenSSL | | | |vulnerability. | |--------+------------+--------------------| | | |Added CSPM as | |Revision|2003-13-Oct |affected. Updated | |1.3 | |SCA and NAM fixed | | | |software status. | |--------+------------+--------------------| | | |In the "Affected | | | |Products" and | | | |"Details" sections, | | | |added CSA and CTR as| |Revision|2003-02-Oct |being affected. In | |1.2 | |the "Software | | | |Versions and Fixes" | | | |section, updated | | | |information about | | | |affected IOS images.| |--------+------------+--------------------| |Revision| |Updated information | |1.1 |2003-30-Sept|about affected IOS | | | |images. | |--------+------------+--------------------| |Revision|2003-30-Sept|Initial public | |1.0 | |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 . This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt . ---------------------------------------------------------------------- This notice is Copyright 2003 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----- Comment: PGP Signed by Sharad Ahlawat, Cisco Systems PSIRT iD8DBQE/p8zpezGozzK2tZARAr97AKDrD/C/VW/UsxwRiiMB6S2adQZqWgCfXBgL e45Wm4vwW0MDx7Q6ego3QY8= =YkdD -----END PGP SIGNATURE-----