It was discovered that the Bind name server daemon is vulnerable to denial of service by triggering an assertion through a crafted DNS query. This only affects installations which use the DNSSEC extentions.
For the stable distribution (sarge) this problem has been fixed in version 9.2.4-1sarge2.
For the upcoming stable distribution (etch) this problem will be fixed soon.
For the unstable distribution (sid) this problem has been fixed in version 9.3.4-1.
We recommend that you upgrade your bind9 package.
MD5 checksums of the listed files are available in the original advisory.