CVE-2018-14644

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CVE-2018-14644

Summary:

Details: 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.

References: https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2018-07.html, https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14644