webfs, a lightweight HTTP server for static content, contains a buffer overflow whereby a long Request-URI in an HTTP request could cause arbitrary code to be executed.
For the stable distribution (woody) this problem has been fixed in version 1.17.1.
The old stable distribution (potato) does not contain a webfs package.
For the unstable distribution (sid) this problem will be fixed soon.
We recommend that you update your webfs package.
MD5 checksums of the listed files are available in the original advisory.