USN-1116-1: Kerberos vulnerability

19 April 2011

krb5 vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 10.10
  • Ubuntu 10.04 LTS
  • Ubuntu 9.10

Summary

An unauthenticated remote user could crash the Kerberos service.

Software Description

  • krb5 - MIT Kerberos services

Details

Felipe Ortega discovered that kadmind did not correctly handle password changing error conditions. An unauthenticated remote attacker could exploit this to crash kadmind, leading to a denial of service.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 10.10
krb5-admin-server - 1.8.1+dfsg-5ubuntu0.7
Ubuntu 10.04 LTS
krb5-admin-server - 1.8.1+dfsg-2ubuntu0.9
Ubuntu 9.10
krb5-admin-server - 1.7dfsg~beta3-1ubuntu0.13

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References