Debian Linux Security Advisory 2054-2 – This update restores the PID file location for bind to the location before the last security update. Several cache-poisoning vulnerabilities have been discovered in BIND. These vulnerabilities are apply only if DNSSEC validation is enabled and trust anchors have been installed, which is not the default.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/90695/dsa-2054-2.txt
Source: https://packetstormsecurity.com/files/90695/Debian-Linux-Security-Advisory-2054-2.html