radiusd-cistron contains a bug allowing a buffer overflow when a long NAS-Port attribute is received. This could allow a remote attacker to execute arbitrary code on the server with the privileges of the RADIUS daemon (usually root).
For the stable distribution (woody) this problem has been fixed in version 1.6.6-1woody1.
For the old stable distribution (potato), this problem will be fixed in a later advisory.
For the unstable distribution (sid) this problem will be fixed soon.
We recommend that you update your radiusd-cistron package.
MD5 checksums of the listed files are available in the original advisory.