Ubuntu Security Notice 391-1 – A heap overflow was discovered in the OLE processing code in libgsf. If a user were tricked into opening a specially crafted OLE document, an attacker could execute arbitrary code with the user’s privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/52779/USN-391-1.txt
Source: https://packetstormsecurity.com/files/52779/Ubuntu-Security-Notice-391-1.html