- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200804-22 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: PowerDNS Recursor: DNS Cache Poisoning Date: April 18, 2008 Bugs: #215567 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 ------------------------------------------------------------------- 1 net-dns/pdns-recursor < 3.1.5 >= 3.1.5 Description =========== Amit Klein of Trusteer reported that insufficient randomness is used to calculate the TRXID values and the UDP source port numbers. 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-3.1.5" References ========== [ 1 ] CVE-2008-1637 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1637 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 http://bugs.gentoo.org. License ======= Copyright 2008 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. http://creativecommons.org/licenses/by-sa/2.5