Ubuntu Security Notice 460-1 – Paul Griffith and Andrew Hogue discovered that Samba did not fully drop root privileges while translating SIDs. A remote authenticated user could issue SMB operations during a small window of opportunity and gain root privileges. Brian Schafer discovered that Samba did not handle NDR parsing correctly. A remote attacker could send specially crafted MS-RPC requests that could overwrite heap memory and execute arbitrary code. It was discovered that Samba did not correctly escape input parameters for external scripts defined in smb.conf. Remote authenticated users could send specially crafted MS-RPC requests and execute arbitrary shell commands.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/56811/USN-460-1.txt
Source: https://packetstormsecurity.com/files/56811/Ubuntu-Security-Notice-460-1.html