pdns_recursor
) are affected. Versions not running in single
threaded mode (distributor-threads=1
) are probably not affected.distributor-threads=1
if this is set.Daniel Drown discovered that his PowerDNS 2.9.21.1 installation crashed on receiving a HINFO CH query. In his enthusiasm, he shared his discovery with the world, forcing a rapid over the weekend release cycle.
While we thank Daniel for his discovery, please study our security policy as outlined in “Security” before making vulnerabilities public.
It is believed that this issue only impacts PowerDNS Authoritative
Servers operating with distributor-threads=1
, but even on other
configurations a database reconnect occurs on receiving a CH HINFO
query.