Ubuntu Security Notice USN-1131-1

Ubuntu Security Notice 1131-1 – 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.

Source: Ubuntu Security Notice USN-1131-1