USN-511-2: Kerberos vulnerability

7 September 2007

krb5, librpcsecgss vulnerability

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

  • Ubuntu 7.04
  • Ubuntu 6.10
  • Ubuntu 6.06 LTS

Software Description

  • krb5
  • librpcsecgss


USN-511-1 fixed vulnerabilities in krb5 and librpcsecgss. The fixes were incomplete, and only reduced the scope of the vulnerability, without fully solving it. This update fixes the problem.

Original advisory details:

It was discovered that the libraries handling RPCSEC_GSS did not correctly validate the size of certain packet structures. An unauthenticated remote user could send a specially crafted request and execute arbitrary code with root privileges.

Update instructions

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

Ubuntu 7.04
libkadm55 - 1.4.4-5ubuntu3.3
librpcsecgss3 - 0.14-2ubuntu1.2
Ubuntu 6.10
libkadm55 - 1.4.3-9ubuntu1.5
librpcsecgss2 - 0.13-2ubuntu0.2
Ubuntu 6.06 LTS
libkadm55 - 1.4.3-5ubuntu0.6
librpcsecgss1 - 0.7-0ubuntu1.2

To update your system, please follow these instructions:

In general, a standard system upgrade is sufficient to affect the necessary changes.