Ubuntu Security Notice USN-770-1 – A flaw was discovered in the clamav-milter initscript which caused the ownership of the current working directory to be changed to the ‘clamav’ user. This update attempts to repair the incorrect ownership for standard system directories.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/77257/USN-770-1.txt
Source: https://packetstormsecurity.com/files/77257/Ubuntu-Security-Notice-770-1.html