Debian Security Advisory DSA 751-1 – The upstream developers have discovered a bug in the DNS lookup code of Squid, the popular WWW proxy cache. When the DNS client UDP port (assigned by the operating system at startup) is unfiltered and the network is not protected from IP spoofing, malicious users can spoof DNS lookups which could result in users being redirected to arbitrary web sites.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/38602/dsa-751-1.txt
Source: https://packetstormsecurity.com/files/38602/Debian-Linux-Security-Advisory-751-1.html