<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd"> <glsa id="200804-22"> <title>PowerDNS Recursor: DNS Cache Poisoning</title> <synopsis> Use of insufficient randomness in PowerDNS Recursor might lead to DNS cache poisoning. </synopsis> <product type="ebuild">pdns-recursor</product> <announced>April 18, 2008</announced> <revised>August 21, 2008: 03</revised> <bug>215567</bug> <bug>231335</bug> <access>remote</access> <affected> <package name="net-dns/pdns-recursor" auto="yes" arch="*"> <unaffected range="ge">3.1.6</unaffected> <vulnerable range="lt">3.1.6</vulnerable> </package> </affected> <background> <p> The PowerDNS Recursor is an advanced recursing nameserver. </p> </background> <description> <p> 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). </p> </description> <impact type="normal"> <p> 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. </p> </impact> <workaround> <p> There is no known workaround at this time. </p> </workaround> <resolution> <p> All PowerDNS Recursor users should upgrade to the latest version: </p> <code> # emerge --sync # emerge --ask --oneshot --verbose ">=net-dns/pdns-recursor-3.1.6"</code> </resolution> <references> <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1637">CVE-2008-1637</uri> <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3217">CVE-2008-3217</uri> </references> <metadata tag="requester" timestamp="Thu, 17 Apr 2008 20:12:08 +0000"> keytoaster </metadata> <metadata tag="submitter" timestamp="Fri, 18 Apr 2008 01:27:35 +0000"> rbu </metadata> <metadata tag="bugReady" timestamp="Fri, 18 Apr 2008 01:27:43 +0000"> rbu </metadata> </glsa>