USN-755-1: Kerberos vulnerabilities
7 April 2009
krb5 vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 8.10
- Ubuntu 8.04 LTS
- Ubuntu 7.10
- Ubuntu 6.06 LTS
Software Description
- krb5
Details
Multiple flaws were discovered in the Kerberos GSS-API and ASN.1 routines that did not correctly handle certain requests. An unauthenticated remote attacker could send specially crafted traffic to crash services using the Kerberos library, leading to a denial of service.
Update instructions
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 8.10
- libkadm55 - 1.6.dfsg.4~beta1-3ubuntu0.1
- libkrb53 - 1.6.dfsg.4~beta1-3ubuntu0.1
- Ubuntu 8.04 LTS
- libkadm55 - 1.6.dfsg.3~beta1-2ubuntu1.1
- libkrb53 - 1.6.dfsg.3~beta1-2ubuntu1.1
- Ubuntu 7.10
- libkadm55 - 1.6.dfsg.1-7ubuntu0.2
- libkrb53 - 1.6.dfsg.1-7ubuntu0.2
- Ubuntu 6.06 LTS
- libkadm55 - 1.4.3-5ubuntu0.8
- libkrb53 - 1.4.3-5ubuntu0.8
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system upgrade you need to restart any services using the Kerberos libraries to effect the necessary changes.