USN-294-1: courier vulnerability

9 June 2006

courier vulnerability

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

  • Ubuntu 6.06 LTS
  • Ubuntu 5.10
  • Ubuntu 5.04

Software Description


A Denial of Service vulnerability has been found in the function for encoding email addresses. Addresses containing a ‘=’ before the ‘@’ character caused the Courier to hang in an endless loop, rendering the service unusable.

Update instructions

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

Ubuntu 6.06 LTS
courier-mta - 0.47-13ubuntu5.1
Ubuntu 5.10
courier-mta - 0.47-3ubuntu7.2
Ubuntu 5.04
courier-mta - 0.47-3ubuntu1.5

To update your system, please follow these instructions:

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