From koon@gentoo.org Mon Dec 12 09:46:16 2005 From: Thierry Carrez To: gentoo-announce@lists.gentoo.org Cc: full-disclosure@lists.grok.org.uk, bugtraq@securityfocus.com, security-alerts@linuxsecurity.com Date: Mon, 12 Dec 2005 15:41:59 +0100 Subject: [Full-disclosure] [ GLSA 200512-04 ] Openswan, IPsec-Tools: Vulnerabilities in ISAKMP Protocol implementation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200512-04 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: Openswan, IPsec-Tools: Vulnerabilities in ISAKMP Protocol implementation Date: December 12, 2005 Bugs: #112568, #113201 ID: 200512-04 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Openswan and IPsec-Tools suffer from an implementation flaw which may allow a Denial of Service attack. Background ========== Openswan is an implementation of IPsec for Linux. IPsec-Tools is a port of KAME's implementation of the IPsec utilities, including racoon, an Internet Key Exchange daemon. Internet Key Exchange version 1 (IKEv1), a derivate of ISAKMP, is an important part of IPsec. IPsec is widely used to secure exchange of packets at the IP layer and mostly used to implement Virtual Private Networks (VPNs). Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-misc/openswan < 2.4.4 >= 2.4.4 2 net-firewall/ipsec-tools < 0.6.3 >= 0.6.3 *>= 0.6.2-r1 *>= 0.4-r2 ------------------------------------------------------------------- 2 affected packages on all of their supported architectures. ------------------------------------------------------------------- Description =========== The Oulu University Secure Programming Group (OUSPG) discovered that various ISAKMP implementations, including Openswan and racoon (included in the IPsec-Tools package), behave in an anomalous way when they receive and handle ISAKMP Phase 1 packets with invalid or abnormal contents. Impact ====== A remote attacker can create a specially crafted packet using 3DES with an invalid key length, resulting in a Denial of Service attack, format string vulnerabilities or buffer overflows. Workaround ========== Avoid using "aggressive mode" in ISAKMP Phase 1, which exchanges information between the sides before there is a secure channel. Resolution ========== All Openswan users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/openswan-2.4.4" All IPsec-Tools users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose net-firewall/ipsec-tools References ========== [ 1 ] CVE-2005-3671 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3671 [ 2 ] CVE-2005-3732 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3732 [ 3 ] Original Advisory http://www.ee.oulu.fi/research/ouspg/protos/testing/c09/isakmp/ Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200512-04.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 2005 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/2.0 [ Part 1.2, "OpenPGP digital signature" Application/PGP-SIGNATURE ] [ 264bytes. ] [ Unable to print this part. ] [ Part 2: "Attached Text" ] _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/