USN-1131-1: Postfix vulnerability

11 May 2011

postfix vulnerability

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

  • Ubuntu 11.04
  • Ubuntu 10.10
  • Ubuntu 10.04 LTS
  • Ubuntu 8.04 LTS
  • Ubuntu 6.06 LTS


An attacker could send crafted input to Postfix and cause it to crash or run programs.

Software Description

  • postfix - High-performance mail transport agent


Thomas Jarosch discovered that Postfix incorrectly handled authentication mechanisms other than PLAIN and LOGIN when the Cyrus SASL library is used. A remote attacker could use this to cause Postfix to crash, leading to a denial of service, or possibly execute arbitrary code as the postfix user.

Update instructions

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

Ubuntu 11.04
postfix - 2.8.2-1ubuntu2.1
Ubuntu 10.10
postfix - 2.7.1-1ubuntu0.2
Ubuntu 10.04 LTS
postfix - 2.7.0-1ubuntu0.2
Ubuntu 8.04 LTS
postfix - 2.5.1-2ubuntu1.4
Ubuntu 6.06 LTS
postfix - 2.2.10-1ubuntu0.4

To update your system, please follow these instructions:

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