Cisco IOS AAA TCL shell command authentication bypass

cisco-aaa-tcl-auth-bypass (24308) The risk level is classified as MediumMedium Risk

Description:

A vulnerability in the Authentication, Authorization, and Accounting (AAA) feature in multiple Cisco devices running Cisco Internetwork Operating System Software (IOS) could allow a local attacker to bypass command authorization. If Tool Command Language (Tcl) is enabled, an authenticated attacker could exploit this vulnerability to execute arbitrary IOS EXEC commands on the affected device.

*CVSS:

Base Score: 4.9
  Access Vector: Local
  Access Complexity: Low
  Authentication: Not Required
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 3.6
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Bypass Security

Remedy:

Refer to cisco-sr-20060125-aaatcl for upgrade or workaround information. See References.

References:

  • cisco-sr-20060125-aaatcl: Cisco Security Response: AAA Command Authorization by-pass.
  • BID-16383: Cisco IOS TCLSH AAA Command Authorization Bypass Vulnerability
  • CVE-1999-0293: AAA authentication on Cisco systems allows attackers to execute commands without authorization.
  • CVE-2006-0485: The TCL shell in Cisco IOS 12.2(14)S before 12.2(14)S16, 12.2(18)S before 12.2(18)S11, and certain other releases before 25 January 2006 does not perform Authentication, Authorization, and Accounting (AAA) command authorization checks, which may allow local users to execute IOS EXEC commands that were prohibited via the AAA configuration, aka Bug ID CSCeh73049.
  • OSVDB ID: 34892: Cisco IOS AAA tclsh Command Authentication Bypass
  • SA18613: Cisco IOS AAA Command Authentication Bypass Vulnerability
  • SECTRACK ID: 1015543: Cisco IOS AAA Command Authorization Feature May Let Remote Authenticated Users Gain Elevated Privileges

Platforms Affected:

  • Cisco IOS 12.0T
  • Cisco IOS 12.0XH
  • Cisco IOS 12.0XK
  • Cisco IOS 12.0XL
  • Cisco IOS 12.0XN
  • Cisco IOS 12.0XR
  • Cisco IOS 12.1
  • Cisco IOS 12.1AA
  • Cisco IOS 12.1E
  • Cisco IOS 12.1EC
  • Cisco IOS 12.1EZ
  • Cisco IOS 12.1GA
  • Cisco IOS 12.1GB
  • Cisco IOS 12.1T
  • Cisco IOS 12.1XA
  • Cisco IOS 12.1XE
  • 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 12.1XS
  • Cisco IOS 12.1XT
  • Cisco IOS 12.1XU
  • Cisco IOS 12.1XV
  • Cisco IOS 12.1XW
  • Cisco IOS 12.1XZ
  • Cisco IOS 12.1YA
  • Cisco IOS 12.1YB
  • Cisco IOS 12.1YD
  • Cisco IOS 12.1YE
  • Cisco IOS 12.1YF
  • Cisco IOS 12.1YH
  • Cisco IOS 12.1YI
  • Cisco IOS 12.2
  • Cisco IOS 12.2B
  • Cisco IOS 12.2BW
  • Cisco IOS 12.2BY
  • Cisco IOS 12.2DD
  • Cisco IOS 12.2DX
  • Cisco IOS 12.2MX
  • Cisco IOS 12.2S
  • Cisco IOS 12.2SU
  • Cisco IOS 12.2SW
  • Cisco IOS 12.2SXB
  • Cisco IOS 12.2SXD
  • Cisco IOS 12.2SXE
  • Cisco IOS 12.2SZ
  • Cisco IOS 12.2XA
  • Cisco IOS 12.2XB
  • Cisco IOS 12.2XC
  • Cisco IOS 12.2XD
  • Cisco IOS 12.2XG
  • Cisco IOS 12.2XH
  • 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 12.2XS
  • Cisco IOS 12.2XU
  • Cisco IOS 12.2XV
  • Cisco IOS 12.2XW
  • Cisco IOS 12.2YB
  • Cisco IOS 12.2YC
  • Cisco IOS 12.2YD
  • Cisco IOS 12.2YE
  • Cisco IOS 12.2YH
  • Cisco IOS 12.2YK
  • Cisco IOS 12.2YL
  • Cisco IOS 12.2YM
  • Cisco IOS 12.2YN
  • Cisco IOS 12.2YT
  • Cisco IOS 12.2YU
  • Cisco IOS 12.2YW
  • Cisco IOS 12.2YX
  • Cisco IOS 12.2YY
  • Cisco IOS 12.2YZ
  • Cisco IOS 12.2ZB
  • Cisco IOS 12.2ZC
  • 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 12.2ZP
  • Cisco IOS 12.3
  • Cisco IOS 12.3B
  • Cisco IOS 12.3T
  • Cisco IOS 12.3XA
  • Cisco IOS 12.3XB
  • 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 12.3XM
  • Cisco IOS 12.3XQ
  • Cisco IOS 12.3XR
  • Cisco IOS 12.3XW
  • Cisco IOS 12.3XY
  • Cisco IOS 12.3YA
  • Cisco IOS 12.3YE
  • Cisco IOS 12.3YF
  • Cisco IOS 12.3YG
  • Cisco IOS 12.3YH
  • Cisco IOS 12.3YI
  • Cisco IOS 12.3YJ
  • Cisco IOS 12.3YK
  • Cisco IOS 12.3YM
  • Cisco IOS 12.3YQ
  • Cisco IOS 12.3YS
  • Cisco IOS 12.3YT
  • Cisco IOS 12.3YU
  • Cisco IOS 12.3YX
  • Cisco IOS 12.4MR
  • Cisco IOS 12.4T

Reported:

Jan 25, 2006

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