RADIUS incorrect Vendor-Length in a Vendor-Specific attribute can cause a denial of service
| radius-vendor-attribute-dos (8354) |  Medium 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:
- CERT Advisory CA-2002-06: Vulnerabilities in Various Implementations of the RADIUS Protocol.
- Cistron RADIUS Web site: Cistron RADIUS server, version 1.6.6.
- Conectiva Linux Announcement CLSA-2002:466: radiusd-cistron.
- FreeBSD Security Notice FreeBSD-SN-02:02: security issues in ports.
- SECURITY.NNOV Advisory - December, 18 2001: Vulnerabilities in multiple RADIUS clients and servers.
- BID-4230: Multiple Vendor Radius Short Vendor-Length Field Denial Of Service Vulnerability
- CVE-2001-1377: Multiple RADIUS implementations do not properly validate the Vendor-Length of the Vendor-Specific attribute, which allows remote attackers to cause a denial of service (crash) via a Vendor-Length that is less than 2.
- OSVDB ID: 7324: Multiple RADIUS Implementation Vendor-Specific Attribute DoS
- RHSA-2002-030: Updated radiusd-cistron packages are available
- US-CERT VU#936683: Multiple implementations of the RADIUS protocol do not adequately validate the vendor-length of the vendor-specific attributes
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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