pdns-recursor: Cache pollution (CVE-2020-25829)
An issue has been found in PowerDNS Recursor where a remote attacker can cause the cached records for a given name to be updated to the ‘Bogus’ DNSSEC validation state, instead of their actual DNSSEC ‘Secure’ state, via a DNS ANY query. This results in a denial of service for installations that always validate (dnssec=validate) and for clients requesting validation when on-demand validation is enabled (dnssec=process).
Affects: PowerDNS Recursor up to and including 4.3.4, 4.2.4 and 4.1.17
Not affected: 4.3.5, 4.2.5, 4.1.18
- master (28194fc4)