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 November 4, 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 https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20030930-ssl.

Affected Products

• This section provides details on affected products.

  Vulnerable Products

  The following products have their SSL implementation based on the OpenSSL code and may be affected by the first OpenSSL vulnerability.

  • 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)
    
  • Cisco Secure Policy Manager (CSPM)
    

  The following products have their SSL implementation based on the OpenSSL code and may be affected by the first and second OpenSSL vulnerabilities.

  • Cisco PIX Firewall
    
  • Cisco Firewall Services Module (FWSM) for the Cisco Catalyst 6500 Series and Cisco 7600 Series routers
    
  • Cisco Content Service Switch (CSS) 11000 series - only the SCM is affected
    
  • Cisco SN 5428 Storage Router
    

  Products Confirmed Not Vulnerable

  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 crypto (56i and k2) image releases in the 12.1E release train for the Cisco 7100 and 7200 Series Routers are affected by the first OpenSSL vulnerability. All IOS software crypto (k8, k9, and k91) image 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 first OpenSSL vulnerabilities. The first vulnerability is documented as Bug ID CSCec46274 ( registered customers only) . Cisco IOS is not affected by the second OpenSSL vulnerability. The HTTPS web service, that uses the OpenSSL code, on the device is disabled by default. The command no ip http secure-server command 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 is documented as Bug ID CSCec69386 ( registered customers only) .
    
  • Cisco Firewall Services Module (FWSM) - The first vulnerability is documented as Bug ID CSCec45573 ( registered customers only) , and the second vulnerability is documented as Bug ID CSCec79098 ( registered customers only) .
    
  • Cisco Network Analysis Modules (NAM) - The first vulnerability is documented as Bug ID CSCec44573 ( registered customers only) . Cisco Network Analysis Modules (NAM) is not affected by the second OpenSSL vulnerability.
    
  • Cisco Content Service Switch (CSS) 11000 series - WebNS version 5.x is not vulnerable to the OpenSSL vulnerabilities. The first vulnerability is documented as Bug ID CSCec45342 ( registered customers only) for WebNS and as Bug ID CSCec45165 ( registered customers only) for the SSL module. The second vulnerability is documented as Bug ID CSCec82334 ( registered customers only) for WebNS. The SSL module is not affected by the second OpenSSL vulnerability.
    
  • Cisco Content Service Switch (CSS) Secure Content Accelerator versions 1 & 2 - The first vulnerability is documented as Bug ID CSCec48769 ( registered customers only) . Cisco Content Service Switch (CSS) Secure Content Accelerator versions 1 & 2 is not affected by the second OpenSSL vulnerability.
    
  • Cisco Threat Response (CTR) - The first vulnerability is documented as Bug IDs CSCec46555 ( registered customers only) and CSCec45342 ( registered customers only) . Cisco Threat Response (CTR) is not affected by the second OpenSSL vulnerability.
    
  • Cisco Global Site Selector (GSS) 4480 - The first vulnerability is documented as Bug ID CSCec45380 ( registered customers only) . Cisco Global Site Selector (GSS) 4480 is not affected by the second OpenSSL vulnerability.
    
  • Cisco Application & Content Networking Software (ACNS) - The first vulnerability is documented as Bug ID CSCec41413 ( registered customers only) . Cisco Application & Content Networking Software (ACNS) is not affected by the second OpenSSL vulnerability.
    
  • Cisco SN 5428 Storage Router - The first vulnerability is documented as Bug ID CSCec44103 ( registered customers only) , and the second vulnerability is documented as Bug ID CSCec69147 ( registered customers only) .
    
  • CiscoWorks 1105 Hosting Solution Engine (HSE) - The first vulnerability is documented as Bug IDs CSCec38542 ( registered customers only) and CSCec50647 ( registered customers only) . CiscoWorks 1105 Hosting Solution Engine (HSE) is not affected by the second OpenSSL vulnerability.
    
  • CiscoWorks 1105 Wireless LAN Solution Engine (WLSE) - The first vulnerability is documented as Bug IDs CSCec38526 ( registered customers only) and CSCec50640 ( registered customers only) . CiscoWorks 1105 Wireless LAN Solution Engine (WLSE) is not affected by the second OpenSSL vulnerability.
    
  • CiscoWorks Common Services (CMF) - Both Solaris and Windows versions 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) . CiscoWorks Common Services (CMF) is not affected by the second OpenSSL vulnerability.
    
  • Cisco SIP Proxy Server (SPS) - The first vulnerability is documented as Bug ID CSCec31901 ( registered customers only) . Cisco SIP Proxy Server (SPS) is not affected by the second OpenSSL vulnerability.
    
  • Cisco Secure Policy Manager (CSPM) - The first vulnerability is documented as Bug ID CSCec61390 ( registered customers only) . Cisco Secure Policy Manager (CSPM) is not affected by the second OpenSSL vulnerability.
    

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 access lists / 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.

Fixed Software

• 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.

  • Cisco IOS -
    

    Train	Fixed Releases	CCO Availability
    12.2S	12.2(14)SY3	November 24, 2003
    	12.2(17a)SX1	October 30, 2003
    12.1E	12.1(20)E2	January 26, 2004
    	12.1(14)E7	October 13, 2003

  • 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). These engineering builds may be obtained by contacting the Cisco Technical Assistance Center (TAC). (Contact information is given in the Obtaining Fixed Software section.)
    
  • Cisco Firewall Services Module (FWSM) - The first vulnerability is fixed in software release 1.1(3.005). The second vulnerability is fixed in software release 2.1(0.208). These engineering builds may be obtained by contacting the Cisco Technical Assistance Center (TAC). (Contact information is given in the Obtaining Fixed Software section.)
    
  • 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 - The first and second vulnerabilities are fixed in software release 6.10.2.03. CCO availability December 17, 2003. The SSL module in the CSS11000 series device is only vulnerable to the first vulnerability and is fixed in software release 7.20.2.06. CCO availability November 11, 2003.
    
  • 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 - The first vulnerability is fixed in software release 1.1(0). CCO availability December 7, 2003.
    
  • 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. CCO availability September 26, 2003. The second vulnerability is fixed in software release 3.4(1.6) and later. 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 October 29, 2003.
    
  • CiscoWorks Common Services (CMF) - CMF patches for the first vulnerability have been created for software release 2.1, 2.2 and 3.0. Available via CCO download.
    
  • Cisco SIP Proxy Server (SPS) - The first vulnerability is fixed in software release 2.2. CCO availability March, 2004.
    
  • Cisco Secure Policy Manager (CSPM) - The first vulnerability is fixed in software release 3.1.10. CCO availability November 21, 2003.
    

Exploitation and Public Announcements

• The Cisco PSIRT is not aware of any malicious use of the vulnerabilities described in this advisory at this time.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20030930-ssl

Revision History

• Revision 2.2	2004-21-Jan	Updated fixed release information and availability for multiple products.
  Revision 2.1	2003-07-Nov	Clarified products that are known to be affected by the second OpenSSL vulnerability. Added CSS 11000 series (SCM only) as an affected product. Added software availability date for CSPM.
  Revision 2.0	2003-04-Nov	Added information on second OpenSSL vulnerability.
  Revision 1.3	2003-13-Oct	Added CSPM as affected. Updated SCA and NAM fixed software status.
  Revision 1.2	2003-02-Oct	In the "Affected Products" and "Details" sections, added CSA and CTR as being affected. In the "Software Versions and Fixes" section, updated information about affected IOS images.
  Revision 1.1	2003-30-Sept	Updated information about affected IOS images.
  Revision 1.0	2003-30-Sept	Initial public release.

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