The remote host is missing an update to zblast announced via advisory DSA 369-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20369-1

Steve Kemp discovered a buffer overflow in zblast-svgalib, when saving the high score file. This vulnerability could be exploited by a local user to gain gid 'games', if they can achieve a high score. For the current stable distribution (woody) this problem has been fixed in version 1.2pre-5woody2. For the unstable distribution (sid) this problem is fixed in version 1.2.1-7. We recommend that you update your zblast package.