Ubuntu Security Notice 600-1 – Sebastian Krahmer discovered that rsync could overflow when handling ACLs. An attacker could construct a malicious set of files that when processed by rsync could lead to arbitrary code execution or a crash.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/65432/USN-600-1.txt
Source: https://packetstormsecurity.com/files/65432/Ubuntu-Security-Notice-600-1.html