GLSA 200804-22: PowerDNS Recursor: DNS Cache Poisoning

http://security.gentoo.org/

Severity:	normal
Title:	PowerDNS Recursor: DNS Cache Poisoning
Date:	04/18/2008
Bugs:	#215567, #231335
ID:	200804-22

Synopsis

Use of insufficient randomness in PowerDNS Recursor might lead to DNS cache poisoning.

Background

The PowerDNS Recursor is an advanced recursing nameserver.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-dns/pdns-recursor	< 3.1.6	>= 3.1.6	All supported architectures

Description

Amit Klein of Trusteer reported that insufficient randomness is used to calculate the TRXID values and the UDP source port numbers (CVE-2008-1637). Thomas Biege of SUSE pointed out that a prior fix to resolve this issue was incomplete, as it did not always enable the stronger random number generator for source port selection (CVE-2008-3217).

Impact

A remote attacker could send malicious answers to insert arbitrary DNS data into the cache. These attacks would in turn help an attacker to perform man-in-the-middle and site impersonation attacks.

Workaround

There is no known workaround at this time.

Resolution

All PowerDNS Recursor users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-dns/pdns-recursor-3.1.6"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200804-22.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.