PowerDNS: Denial of service

Background

The PowerDNS nameserver is an authoritative-only nameserver which uses a flexible backend architecture.

Description

A vulnerability has been found in PowerDNS which could cause a packet loop of DNS responses.

Impact

A remote attacker could send specially crafted DNS response packets, possibly resulting in a Denial of Service condition.

Workaround

PowerDNS users can set “cache-ttl=0” in /etc/powerdns/pdns.conf and then restart the PowerDNS daemon:

# /etc/init.d/pdns restart

Please review the PowerDNS Security Advisory below for more workaround details.

Resolution

All PowerDNS users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=net-dns/pdns-3.0.1"