PowerDNS: Denial of Service

1. Gentoo Linux Security Advisory

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-dns/pdns	< 3.0.1	>= 3.0.1	All supported architectures

Related bugreports: #398403

A vulnerability in PowerDNS could allow a remote attacker to create a Denial of Service condition.

2. Impact Information

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

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

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

3. Resolution Information

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

Code Listing 3.1: Workaround

  # /etc/init.d/pdns restart

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

All PowerDNS users should upgrade to the latest version:

Code Listing 3.2: Resolution

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

4. References

Page updated February 22, 2012

Summary: This is a Gentoo Linux Security Advisory

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