[ GLSA 200804-22 ] PowerDNS Recursor: DNS Cache Poisoning

[GLSA]

Gentoo Linux Security Advisory

Title: PowerDNS Recursor: DNS Cache Poisoning (GLSA 200804-22)
Severity: normal
Exploitable: remote
Date: April 18, 2008
Updated: August 21, 2008
Bug(s): #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: net-dns/pdns-recursor
Vulnerable: < 3.1.6
Unaffected: >= 3.1.6
Architectures: 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: