The falconseye package is vulnerable to a buffer overflow exploited via a long -s command line option. This vulnerability could be used by an attacker to gain gid 'games' on a system where falconseye is installed.
Note that falconseye does not contain the file permission error CAN-2003-0359 which affected some other nethack packages.
For the stable distribution (woody) this problem has been fixed in version 1.9.3-7woody3.
For the unstable distribution (sid) this problem has been fixed in version 1.9.3-9.
We recommend that you update your falconseye package.
MD5 checksums of the listed files are available in the original advisory.