The remote host is missing an update to xbl announced via advisory DSA 345-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20345-1

Another buffer overflow was discovered in xbl, distinct from the one addressed in DSA-327 (CVE-2003-0451), involving the -display command line option. This vulnerability could be exploited by a local attacker to gain gid 'games'. For the stable distribution (woody) this problem has been fixed in version 1.0k-3woody2. For the unstable distribution (sid) this problem is fixed in version 1.0k-6. We recommend that you update your xbl package.