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.
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 ESM (Trusty Tahr):DNE (trusty was needs-triage)
Ubuntu 16.04 LTS (Xenial Xerus):needs-triage
Ubuntu 18.04 LTS (Bionic Beaver):needs-triage
Ubuntu 19.04 (Disco Dingo):ignored (reached end-of-life)
Ubuntu 19.10 (Eoan Ermine):needs-triage
Ubuntu 20.04 (Focal Fossa):needs-triage
More Information

Updated: 2020-01-23 20:37:31 UTC (commit b4629892d998f2ede31f59bb7508dc50a92ac664)