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Message-ID: <200507220735.59393.jaervosz@gentoo.org> Date: Fri Jul 22 06:36:11 2005 From: jaervosz at gentoo.org (Sune Kloppenborg Jeppesen) Subject: [ GLSA 200507-20 ] Shorewall: Security policy bypass - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200507-20 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Low Title: Shorewall: Security policy bypass Date: July 22, 2005 Bugs: #99398 ID: 200507-20 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== A vulnerability in Shorewall allows clients authenticated by MAC address filtering to bypass all other security rules. Background ========== Shorewall is a high level tool for configuring Netfilter, the firewall facility included in the Linux Kernel. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-firewall/shorewall < 2.4.1 *>= 2.2.5 >= 2.4.1 Description =========== Shorewall fails to enforce security policies if configured with "MACLIST_DISPOSITION" set to "ACCEPT" or "MACLIST_TTL" set to a value greater or equal to 0. Impact ====== A client authenticated by MAC address filtering could bypass all security policies, possibly allowing him to gain access to restricted services. Workaround ========== Set "MACLIST_TTL" to "0" and "MACLIST_DISPOSITION" to "REJECT" in the Shorewall configuration file (usually /etc/shorewall/shorewall.conf). Resolution ========== All Shorewall users should upgrade to the latest available version: # emerge --sync # emerge --ask --oneshot --verbose net-firewall/shorewall References ========== [ 1 ] CAN-2005-2317 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2317 [ 2 ] Shorewall Announcement http://www.shorewall.net/News.htm#20050717 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200507-20.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@...too.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 -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 189 bytes Desc: not available Url : http://lists.grok.org.uk/pipermail/full-disclosure/attachments/20050722/18536b62/attachment.bin
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