USN-1113-1: Postfix vulnerabilities

18 April 2011

postfix vulnerabilities

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

  • Ubuntu 10.10
  • Ubuntu 10.04 LTS
  • Ubuntu 9.10
  • Ubuntu 8.04 LTS
  • Ubuntu 6.06 LTS


An attacker could send crafted input to Postfix and cause it to reveal confidential information.

Software Description

  • postfix - High-performance mail transport agent


It was discovered that the Postfix package incorrectly granted write access on the PID directory to the postfix user. A local attacker could use this flaw to possibly conduct a symlink attack and overwrite arbitrary files. This issue only affected Ubuntu 6.06 LTS and 8.04 LTS. (CVE-2009-2939)

Wietse Venema discovered that Postfix incorrectly handled cleartext commands after TLS is in place. A remote attacker could exploit this to inject cleartext commands into TLS sessions, and possibly obtain confidential information such as passwords. (CVE-2011-0411)

Update instructions

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

Ubuntu 10.10
postfix - 2.7.1-1ubuntu0.1
Ubuntu 10.04 LTS
postfix - 2.7.0-1ubuntu0.1
Ubuntu 9.10
postfix - 2.6.5-3ubuntu0.1
Ubuntu 8.04 LTS
postfix - 2.5.1-2ubuntu1.3
Ubuntu 6.06 LTS
postfix - 2.2.10-1ubuntu0.3

To update your system, please follow these instructions:

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