Steve Kemp discovered a buffer overflow in freesweep, when processing several environment variables. This vulnerability could be exploited by a local user to gain gid 'games'.
For the current stable distribution (woody) this problem has been fixed in version 0.88-4woody1.
For the unstable distribution (sid) this problem will be fixed soon.
We recommend that you update your freesweep package.
MD5 checksums of the listed files are available in the original advisory.