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ERRATA: [ GLSA 200507-20 ] Shorewall: Security policy bypass
From: Thierry Carrez <koon () gentoo org>
Date: Sat, 17 Sep 2005 14:31:52 +0200
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory [ERRATA UPDATE] GLSA 200507-20:02 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Low Title: Shorewall: Security policy bypass Date: July 22, 2005 Updated: September 14, 2005 Bugs: #99398 ID: 200507-20:02 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Errata ====== The "unaffected" version was incorrectly set to 2.4.1 in the initial advisory, the correct "unaffected" version is 2.4.2. The corrected sections appear below. 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 >= 2.4.2 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. The default installation has MACLIST_DISPOSITION=REJECT and MACLIST_TTL=(blank) (equivalent to 0). This can be checked by looking at the settings in /etc/shorewall/shorewall.conf 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 () 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
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Current thread:
- ERRATA: [ GLSA 200507-20 ] Shorewall: Security policy bypass Thierry Carrez (Sep 17)
- <Possible follow-ups>
- ERRATA: [ GLSA 200507-20 ] Shorewall: Security policy bypass koon (Sep 19)