RADIUS authentication security bypass

radius-authentication-bypass (21190) The risk level is classified as HighHigh Risk

Description:

RADIUS (Remote Authentication Dial In User Service) could allow a remote attacker to bypass security authentication.

Platforms Affected:

  • Cisco, IOS 12.2B
  • Cisco, IOS 12.2BC
  • Cisco, IOS 12.2BW
  • Cisco, IOS 12.2BX
  • Cisco, IOS 12.2BY
  • Cisco, IOS 12.2BZ
  • Cisco, IOS 12.2CX
  • Cisco, IOS 12.2CY
  • Cisco, IOS 12.2CZ
  • Cisco, IOS 12.2EW
  • Cisco, IOS 12.2EWA
  • Cisco, IOS 12.2EY
  • Cisco, IOS 12.2EZ
  • Cisco, IOS 12.2JA
  • Cisco, IOS 12.2JK
  • Cisco, IOS 12.2MB
  • Cisco, IOS 12.2MC
  • Cisco, IOS 12.2MX
  • Cisco, IOS 12.2SE
  • Cisco, IOS 12.2SXD
  • Cisco, IOS 12.2SXE
  • Cisco, IOS 12.2T
  • Cisco, IOS 12.2XB
  • Cisco, IOS 12.2XC
  • 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 12.2XQ
  • Cisco, IOS 12.2XW
  • Cisco, IOS 12.2YA
  • Cisco, IOS 12.2YB
  • Cisco, IOS 12.2YC
  • Cisco, IOS 12.2YD
  • Cisco, IOS 12.2YF
  • Cisco, IOS 12.2YG
  • Cisco, IOS 12.2YH
  • Cisco, IOS 12.2YJ - 12.2YZ
  • Cisco, IOS 12.2ZB to 12.2ZP
  • Cisco, IOS 12.3
  • Cisco, IOS 12.3B
  • Cisco, IOS 12.3BC
  • Cisco, IOS 12.3BW
  • Cisco, IOS 12.3JA
  • Cisco, IOS 12.3T
  • 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 12.3XL
  • Cisco, IOS 12.3XM
  • Cisco, IOS 12.3XN
  • Cisco, IOS 12.3XQ
  • Cisco, IOS 12.3XR
  • Cisco, IOS 12.3XS
  • Cisco, IOS 12.3XT
  • Cisco, IOS 12.3XU
  • Cisco, IOS 12.3XW
  • Cisco, IOS 12.3XX
  • Cisco, IOS 12.3XY
  • Cisco, IOS 12.3YA
  • Cisco, IOS 12.3YD-YQ
  • Cisco, IOS 12.3YS

Remedy:

Upgrade to the latest fixed version, as listed in Cisco Security Advisory 2005 June 29 1600 UTC. See References.

Consequences:

Bypass Security

References:

  • Cisco Security Advisory 2005 June 29 1600 UTC, RADIUS Authentication Bypass at http://www.cisco.com/warp/public/707/cisco-sa-20050629-aaa.shtml.
  • BID-14092: Cisco IOS AAA RADIUS Authentication Bypass Vulnerability
  • CVE-2005-2105: Cisco IOS 12.2T through 12.4 allows remote attackers to bypass Authentication, Authorization, and Accounting (AAA) RADIUS authentication, if the fallback method is set to none, via a long username.
  • SECTRACK ID: 1014330: Cisco IOS RADIUS Fallback `None` Authentication Error Lets Remote Users Bypass Authentication

Reported:

Jun 29, 2005

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