- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200904-11 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: High Title: Tor: Multiple vulnerabilities Date: April 08, 2009 Bugs: #250018, #256078, #258833 ID: 200904-11 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Multiple vulnerabilities in Tor might allow for heap corruption, Denial of Service, escalation of privileges and information disclosure. Background ========== Tor is an implementation of second generation Onion Routing, a connection-oriented anonymizing communication service. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-misc/tor < 0.2.0.34 >= 0.2.0.34 Description =========== * Theo de Raadt reported that the application does not properly drop privileges to the primary groups of the user specified via the "User" configuration option (CVE-2008-5397). * rovv reported that the "ClientDNSRejectInternalAddresses" configuration option is not always enforced (CVE-2008-5398). * Ilja van Sprundel reported a heap-corruption vulnerability that might be remotely triggerable on some platforms (CVE-2009-0414). * It has been reported that incomplete IPv4 addresses are treated as valid, violating the specification (CVE-2009-0939). * Three unspecified vulnerabilities have also been reported (CVE-2009-0936, CVE-2009-0937, CVE-2009-0938). Impact ====== A local attacker could escalate privileges by leveraging unintended supplementary group memberships of the Tor process. A remote attacker could exploit these vulnerabilities to cause a heap corruption with unknown impact and attack vectors, to cause a Denial of Service via CPU consuption or daemon crash, and to weaken anonymity provided by the service. Workaround ========== There is no known workaround at this time. Resolution ========== All Tor users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/tor-0.2.0.34" References ========== [ 1 ] CVE-2008-5397 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5397 [ 2 ] CVE-2008-5398 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5398 [ 3 ] CVE-2009-0414 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0414 [ 4 ] CVE-2009-0936 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0936 [ 5 ] CVE-2009-0937 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0937 [ 6 ] CVE-2009-0938 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0938 [ 7 ] CVE-2009-0939 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0939 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200904-11.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 2009 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