Ubuntu Security Notice USN-696-1 – Emanuele Aina discovered that Avahi did not properly validate it’s input when processing data over D-Bus. A local attacker could send an empty TXT message via D-Bus and cause a denial of service (failed assertion). This issue only affected Ubuntu 6.06 LTS. Hugo Dias discovered that Avahi did not properly verify it’s input when processing mDNS packets. A remote attacker could send a crafted mDNS packet and cause a denial of service (assertion failure).
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/73308/USN-696-1.txt
Source: https://packetstormsecurity.com/files/73308/Ubuntu-Security-Notice-696-1.html