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.
{ "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "4.0.0~alpha2-2ubuntu0.1+esm1", "binary_name": "pdns-recursor" }, { "binary_version": "4.0.0~alpha2-2ubuntu0.1+esm1", "binary_name": "pdns-recursor-dbgsym" } ] }
{ "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "4.1.1-2ubuntu0.1~esm1", "binary_name": "pdns-recursor" }, { "binary_version": "4.1.1-2ubuntu0.1~esm1", "binary_name": "pdns-recursor-dbgsym" } ] }