Ubuntu Security Notice USN-733-1 – It was discovered that the Base64 encoding functions in evolution-data-server did not properly handle large strings. If a user were tricked into opening a specially crafted image file, or tricked into connecting to a malicious server, an attacker could possibly execute arbitrary code with user privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/75765/USN-733-1.txt
Source: https://packetstormsecurity.com/files/75765/Ubuntu-Security-Notice-733-1.html