Steve Kemp discovered a buffer overflow in xconq, in processing the USER environment variable. In the process of fixing this bug, a similar problem was discovered with the DISPLAY environment variable. This vulnerability could be exploited by a local attacker to gain gid 'games'.
For the current stable distribution (woody) this problem has been fixed in version 7.4.1-2woody2.
For the unstable distribution (sid) this problem will be fixed soon. Refer to Debian bug #202963.
We recommend that you update your xconq package.
MD5 checksums of the listed files are available in the original advisory.