RADIUS incorrect Vendor-Length in a Vendor-Specific attribute can cause a denial of service

radius-vendor-attribute-dos (8354) The risk level is classified as MediumMedium Risk

Description:

Multiple vendor implementations of the RADIUS (Remote Authentication Dial In User Service) Protocol are vulnerable to a denial of service attack caused improper validation of the Vendor-Specific Length attribute. A remote attacker can set the Vendor-Length of a Vendor-Specific attribute to value less than 2 to cause the RADIUS server or client to crash.


Consequences:

Denial of Service

Remedy:

Upgrade to the latest version of Cistron RADIUS (1.6.6 or later), available from the Cistron RADIUS Web site. See References.

For Red Hat Powertools 7.0 and 7.1:
Upgrade to the latest version of radiusd-cistron (1.6.6-2 or later), as listed in Red Hat Linux Errata Advisory RHSA-2002:030-08. See References.

For other distributions:
Contact your vendor for upgrade or patch information or refer to CERT Vulnerability Note VU#936683. See References.

References:

Platforms Affected:

  • Cistron Cistron RADIUS 1.6.4
  • FreeRADIUS FreeRADIUS prior to 0.4
  • GNU Radius 0.92.1
  • GNU Radius 0.93
  • GNU Radius 0.94
  • GNU Radius 0.95
  • IC ICRadius
  • RedHat Linux 7
  • RedHat Linux 7.1
  • RedHat Linux 7.2
  • RedHat Linux 7.3
  • RedHat Linux Powertools 7.0
  • RedHat Linux Powertools 7.1
  • XTRADIUS XTRADIUS prior to 1.2.1
  • YARD RADIUS YARD RADIUS 1.0.19

Reported:

Dec 18, 2001

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