Multiple Cisco devices ClientHello SSL message denial of service

cisco-ios-clienthello-dos (34432) The risk level is classified as MediumMedium Risk

Description:

Multiple Cisco devices running IOS are vulnerable to a denial of service attack caused by improper handling of ClientHello SSL messages. A remote attacker could send a specially-crafted ClientHello message to cause an affected device to crash.

*CVSS:

Base Score: 5
  Access Vector: Remote
  Access Complexity: Low
  Authentication: Not Required
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Complete
 
Temporal Score: 3.7
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Refer to cisco-sa-20070522-SSL for patch, upgrade, or suggested workaround information. See References.

References:

  • cisco-sa-20070522-SSL: Cisco Security Advisory: Multiple Vulnerabilities in Cisco IOS While Processing SSL Packets.
  • BID-24097: Cisco IOS SSL Packets Multiple Denial Of Service Vulnerabilities
  • CVE-2007-2813: Cisco IOS 12.4 and earlier, when using the crypto packages and SSL support is enabled, allows remote attackers to cause a denial of service via a malformed (1) ClientHello, (2) ChangeCipherSpec, or (3) Finished message during an SSL session.
  • OSVDB ID: 35339: Cisco IOS Malformed SSL Messages DoS
  • SA25361: Cisco IOS SSL Messages Denial of Service Vulnerabilities
  • SECTRACK ID: 1018094: Cisco IOS ClientHello, ChangeCipherSpec, and Finished SSL Messages Let Remote Users Deny Service

Platforms Affected:

  • Cisco IOS 12.0T
  • Cisco IOS 12.0WC
  • Cisco IOS 12.0XE
  • Cisco IOS 12.0XH
  • Cisco IOS 12.0XI
  • Cisco IOS 12.0XK
  • Cisco IOS 12.0XL
  • Cisco IOS 12.0XN
  • Cisco IOS 12.0XQ
  • Cisco IOS 12.0XR
  • Cisco IOS 12.0XV
  • Cisco IOS 12.1
  • Cisco IOS 12.1AY
  • Cisco IOS 12.1CX
  • Cisco IOS 12.1E
  • Cisco IOS 12.1EA
  • Cisco IOS 12.1EB
  • Cisco IOS 12.1EC
  • Cisco IOS 12.1EW
  • Cisco IOS 12.1EX
  • Cisco IOS 12.1EY
  • Cisco IOS 12.1T
  • Cisco IOS 12.1XC
  • Cisco IOS 12.1XD
  • Cisco IOS 12.1XF
  • Cisco IOS 12.1XG
  • Cisco IOS 12.1XH
  • Cisco IOS 12.1XI
  • Cisco IOS 12.1XJ
  • Cisco IOS 12.1XL
  • Cisco IOS 12.1XM
  • Cisco IOS 12.1XP
  • Cisco IOS 12.1XQ
  • Cisco IOS 12.1XT
  • Cisco IOS 12.1XU
  • Cisco IOS 12.1YB
  • Cisco IOS 12.1YC
  • Cisco IOS 12.1YD
  • Cisco IOS 12.1YE
  • Cisco IOS 12.1YF
  • Cisco IOS 12.1YI
  • Cisco IOS 12.2
  • Cisco IOS 12.21XA
  • Cisco IOS 12.21XB
  • Cisco IOS 12.2B
  • Cisco IOS 12.2BC
  • Cisco IOS 12.2BW
  • Cisco IOS 12.2BY
  • Cisco IOS 12.2BZ
  • Cisco IOS 12.2CX
  • Cisco IOS 12.2CY
  • Cisco IOS 12.2CZ
  • Cisco IOS 12.2DD
  • Cisco IOS 12.2EW
  • Cisco IOS 12.2EWA
  • Cisco IOS 12.2EX
  • Cisco IOS 12.2EY
  • Cisco IOS 12.2EZ
  • Cisco IOS 12.2FX
  • Cisco IOS 12.2JA
  • Cisco IOS 12.2JK
  • Cisco IOS 12.2S
  • Cisco IOS 12.2SBC
  • Cisco IOS 12.2SE
  • Cisco IOS 12.2SEA
  • Cisco IOS 12.2SEB
  • Cisco IOS 12.2SEC
  • Cisco IOS 12.2SED
  • Cisco IOS 12.2SEE
  • Cisco IOS 12.2SEF
  • Cisco IOS 12.2SEG
  • Cisco IOS 12.2SG
  • Cisco IOS 12.2SU
  • Cisco IOS 12.2SV
  • Cisco IOS 12.2SW
  • Cisco IOS 12.2SX
  • Cisco IOS 12.2SXA
  • Cisco IOS 12.2SXB
  • Cisco IOS 12.2SXD
  • Cisco IOS 12.2SXE
  • Cisco IOS 12.2SXF
  • Cisco IOS 12.2SY
  • Cisco IOS 12.2T
  • Cisco IOS 12.2TPC
  • Cisco IOS 12.2XA
  • Cisco IOS 12.2XB
  • Cisco IOS 12.2XD
  • Cisco IOS 12.2XE
  • Cisco IOS 12.2XF
  • Cisco IOS 12.2XG
  • Cisco IOS 12.2XH
  • Cisco IOS 12.2XI
  • Cisco IOS 12.2XJ
  • Cisco IOS 12.2XK
  • Cisco IOS 12.2XL
  • Cisco IOS 12.2XM
  • Cisco IOS 12.2XN
  • Cisco IOS 12.2XQ
  • Cisco IOS 12.2XR
  • Cisco IOS 12.2XS
  • Cisco IOS 12.2XT
  • Cisco IOS 12.2XU
  • Cisco IOS 12.2XV
  • Cisco IOS 12.2XW
  • Cisco IOS 12.2YA
  • Cisco IOS 12.2YB
  • Cisco IOS 12.2YC
  • Cisco IOS 12.2YD
  • Cisco IOS 12.2YE
  • Cisco IOS 12.2YF
  • Cisco IOS 12.2YJ
  • Cisco IOS 12.2YL
  • Cisco IOS 12.2YM
  • Cisco IOS 12.2YN
  • Cisco IOS 12.2YQ
  • Cisco IOS 12.2YR
  • Cisco IOS 12.2YU
  • Cisco IOS 12.2YV
  • Cisco IOS 12.2YW
  • Cisco IOS 12.2YX
  • Cisco IOS 12.2YY
  • Cisco IOS 12.2YZ
  • Cisco IOS 12.2ZA
  • Cisco IOS 12.2ZB
  • Cisco IOS 12.2ZD
  • Cisco IOS 12.2ZE
  • Cisco IOS 12.2ZF
  • Cisco IOS 12.2ZH
  • Cisco IOS 12.2ZJ
  • Cisco IOS 12.2ZL
  • Cisco IOS 12.2ZN
  • Cisco IOS 12.2ZU
  • Cisco IOS 12.2ZV
  • Cisco IOS 12.2ZW
  • Cisco IOS 12.2ZX
  • Cisco IOS 12.3
  • Cisco IOS 12.3B
  • Cisco IOS 12.3BC
  • Cisco IOS 12.3JA
  • Cisco IOS 12.3JEA
  • Cisco IOS 12.3JK
  • Cisco IOS 12.3JX
  • Cisco IOS 12.3T
  • Cisco IOS 12.3TPC
  • Cisco IOS 12.3XA
  • Cisco IOS 12.3XB
  • Cisco IOS 12.3XC
  • Cisco IOS 12.3XD
  • Cisco IOS 12.3XE
  • Cisco IOS 12.3XF
  • Cisco IOS 12.3XG
  • Cisco IOS 12.3XH
  • Cisco IOS 12.3XI
  • Cisco IOS 12.3XJ
  • Cisco IOS 12.3XK
  • Cisco IOS 12.3XQ
  • Cisco IOS 12.3XR
  • Cisco IOS 12.3XS
  • Cisco IOS 12.3XU
  • Cisco IOS 12.3XW
  • Cisco IOS 12.3XX
  • Cisco IOS 12.3YA
  • Cisco IOS 12.3YD
  • Cisco IOS 12.3YF
  • Cisco IOS 12.3YG
  • Cisco IOS 12.3YH
  • Cisco IOS 12.3YI
  • Cisco IOS 12.3YK
  • Cisco IOS 12.3YQ
  • Cisco IOS 12.3YS
  • Cisco IOS 12.3YT
  • Cisco IOS 12.3YU
  • Cisco IOS 12.3YX
  • Cisco IOS 12.3YZ
  • Cisco IOS 12.4
  • Cisco IOS 12.4T
  • Cisco IOS 12.4XA
  • Cisco IOS 12.4XB
  • Cisco IOS 12.4XC
  • Cisco IOS 12.4XD
  • Cisco IOS 12.4XE
  • Cisco IOS 12.4XP
  • Cisco IOS 12.4XT

Reported:

May 22, 2007

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