A vulnerability was discovered in libnids, a library used to analyze IP network traffic, whereby a carefully crafted TCP datagram could cause memory corruption and potentially execute arbitrary code with the privileges of the user executing a program which uses libnids (such as dsniff).
For the current stable distribution (woody) this problem has been fixed in version 1.16-3woody1.
For the unstable distribution (sid) this problem will be fixed soon.
We recommend that you update your libnids package.
MD5 checksums of the listed files are available in the original advisory.