Binary package “sxid” in ubuntu lucid
suid, sgid file and directory checking
This program runs as a cronjob. Basically it tracks any changes in
your s[ug]id files and folders. If there are any new ones, ones that
aren't set any more, or they have changed bits or other modes, then it
reports the changes. You can also run this manually for spot checking.
It tracks s[ug]id files by md5 checksums. This helps detect if your files
have been tampered with, would not show under normal name and permissions
checking. Directories are tracked by inodes.