- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200801-16 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: MaraDNS: CNAME Denial of Service Date: January 29, 2008 Bugs: #204351 ID: 200801-16 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== MaraDNS is prone to a Denial of Service vulnerability impacting CNAME resolution. Background ========== MaraDNS is a package that implements the Domain Name Service (DNS) with resolver and caching ability. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-dns/maradns < 1.2.12.08 >= 1.2.12.08 Description =========== Michael Krieger reported that a specially crafted DNS could prevent an authoritative canonical name (CNAME) record from being resolved because of an "improper rotation of resource records". Impact ====== A remote attacker could send specially crafted DNS packets to a vulnerable server, making it unable to resolve CNAME records. Workaround ========== Add "max_ar_chain = 2" to the "marac" configuration file. Resolution ========== All MaraDNS users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-dns/maradns-1.2.12.09" References ========== [ 1 ] CVE-2008-0061 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0061 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200801-16.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