Przemyslaw Frasunek discovered a vulnerability in tnftpd or lukemftpd respectively, the enhanced ftp daemon from NetBSD. An attacker could utilise this to execute arbitrary code on the server.
For the stable distribution (woody) this problem has been fixed in version 1.1-1woody2.
For the unstable distribution (sid) this problem has been fixed in version 1.1-2.2.
We recommend that you upgrade your lukemftpd package.
MD5 checksums of the listed files are available in the original advisory.