Calle Dybedahl discovered a bug in lyskom-server which could result in a denial of service where an unauthenticated user could cause the server to become unresponsive as it processes a large query.
For the stable distribution (woody) this problem has been fixed in version 2.0.6-1woody1.
The old stable distribution (potato) does not contain a lyskom-server package.
For the unstable distribution (sid) this problem is fixed in version 2.0.7-2.
We recommend that you update your lyskom-server package.
MD5 checksums of the listed files are available in the original advisory.