From koon@gentoo.org Wed Oct 12 07:55:21 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: Wed, 12 Oct 2005 13:51:45 +0200 Subject: [Full-disclosure] [ GLSA 200510-11 ] OpenSSL: SSL 2.0 protocol rollback - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200510-11 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Low Title: OpenSSL: SSL 2.0 protocol rollback Date: October 12, 2005 Bugs: #108852 ID: 200510-11 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== When using a specific option, OpenSSL can be forced to fallback to the less secure SSL 2.0 protocol. Background ========== OpenSSL is a toolkit implementing the Secure Sockets Layer, Transport Layer Security protocols and a general-purpose cryptography library. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 dev-libs/openssl < 0.9.8-r1 >= 0.9.8-r1 *>= 0.9.7h *>= 0.9.7g-r1 *>= 0.9.7e-r2 Description =========== Applications setting the SSL_OP_MSIE_SSLV2_RSA_PADDING option (or the SSL_OP_ALL option, that implies it) can be forced by a third-party to fallback to the less secure SSL 2.0 protocol, even if both parties support the more secure SSL 3.0 or TLS 1.0 protocols. Impact ====== A man-in-the-middle attacker can weaken the encryption used to communicate between two parties, potentially revealing sensitive information. Workaround ========== If possible, disable the use of SSL 2.0 in all OpenSSL-enabled applications. Resolution ========== All OpenSSL users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose dev-libs/openssl References ========== [ 1 ] CAN-2005-2969 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2969 [ 2 ] OpenSSL security advisory http://www.openssl.org/news/secadv_20051011.txt Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200510-11.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 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 ] [ 196bytes. ] [ 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/