CVE-2018-14644

An issue has been found in PowerDNS Recursor from 4.0.0 up to and including
4.1.4. A remote attacker sending a DNS query for a meta-type like OPT can
lead to a zone being wrongly cached as failing DNSSEC validation. It only
arises if the parent zone is signed, and all the authoritative servers for
that parent zone answer with FORMERR to a query for at least one of the
meta-types. As a result, subsequent queries from clients requesting DNSSEC
validation will be answered with a ServFail.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=913162&gt;