This document is about PowerDNS 4.X. If you have PowerDNS 3.X, please see the PowerDNS 3.X documentation

PowerDNS Security Advisory 2008-03: Some PowerDNS Configurations can be forced to restart remotely

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.