CVE-2016-7068

An issue has been found in PowerDNS before 3.4.11 and 4.0.2, and PowerDNS
recursor before 3.7.4 and 4.0.4, allowing a remote, unauthenticated
attacker to cause an abnormal CPU usage load on the PowerDNS server by
sending crafted DNS queries, which might result in a partial denial of
service if the system becomes overloaded. This issue is based on the fact
that the PowerDNS server parses all records present in a query regardless
of whether they are needed or even legitimate. A specially crafted query
containing a large number of records can be used to take advantage of that
behaviour.

Bugs

• <https://bugs.launchpad.net/ubuntu/+source/pdns-recursor/+bug/1656931&gt;