USN-1088-1: Kerberos vulnerability

15 March 2011

krb5 vulnerability

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

  • Ubuntu 10.10
  • Ubuntu 10.04 LTS
  • Ubuntu 9.10


MIT Kerberos 5 Key Distribution Center (KDC) daemon denial of service vulnerability.

Software Description

  • krb5 - MIT Kerberos master server (kadmind)


Cameron Meadors discovered that the MIT Kerberos 5 Key Distribution Center (KDC) daemon is vulnerable to a double-free condition if the Public Key Cryptography for Initial Authentication (PKINIT) capability is enabled. This could allow a remote attacker to cause a denial of service.

Update instructions

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

Ubuntu 10.10
krb5-kdc - 1.8.1+dfsg-5ubuntu0.6
Ubuntu 10.04 LTS
krb5-kdc - 1.8.1+dfsg-2ubuntu0.8
Ubuntu 9.10
krb5-kdc - 1.7dfsg~beta3-1ubuntu0.12

To update your system, please follow these instructions:

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