Ubuntu Security Notice 634-1 – Cameron Hotchkies discovered that OpenLDAP did not correctly handle certain ASN.1 BER data. A remote attacker could send a specially crafted packet and crash slapd, leading to a denial of service.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/68748/USN-634-1.txt
Source: https://packetstormsecurity.com/files/68748/Ubuntu-Security-Notice-634-1.html