Ubuntu Security Notice USN-1131-1
11th May, 2011
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.
- 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.
The problem can be corrected by updating your system to the following package version:
- 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: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.