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Gentoo Linux Security Advisory [ERRATA UPDATE] GLSA 200507-20:02 |
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http://security.gentoo.org/ |
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Severity: Low |
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Title: Shorewall: Security policy bypass |
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Date: July 22, 2005 |
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Updated: September 14, 2005 |
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Bugs: #99398 |
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ID: 200507-20:02 |
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Errata |
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====== |
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|
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The "unaffected" version was incorrectly set to 2.4.1 in the initial |
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advisory, the correct "unaffected" version is 2.4.2. |
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The corrected sections appear below. |
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Synopsis |
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======== |
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|
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A vulnerability in Shorewall allows clients authenticated by MAC |
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address filtering to bypass all other security rules. |
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Background |
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========== |
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Shorewall is a high level tool for configuring Netfilter, the firewall |
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facility included in the Linux Kernel. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 net-firewall/shorewall <= 2.4.1 >= 2.4.2 |
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|
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Description |
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=========== |
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|
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Shorewall fails to enforce security policies if configured with |
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"MACLIST_DISPOSITION" set to "ACCEPT" or "MACLIST_TTL" set to a value |
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greater or equal to 0. |
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|
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Impact |
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====== |
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|
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A client authenticated by MAC address filtering could bypass all |
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security policies, possibly allowing him to gain access to restricted |
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services. The default installation has MACLIST_DISPOSITION=REJECT and |
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MACLIST_TTL=(blank) (equivalent to 0). This can be checked by looking |
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at the settings in /etc/shorewall/shorewall.conf |
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|
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Workaround |
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========== |
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|
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Set "MACLIST_TTL" to "0" and "MACLIST_DISPOSITION" to "REJECT" in the |
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Shorewall configuration file (usually /etc/shorewall/shorewall.conf). |
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Resolution |
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========== |
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All Shorewall users should upgrade to the latest available version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose net-firewall/shorewall |
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|
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References |
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========== |
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|
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[ 1 ] CAN-2005-2317 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2317 |
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[ 2 ] Shorewall Announcement |
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http://www.shorewall.net/News.htm#20050717 |
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|
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Availability |
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============ |
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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http://security.gentoo.org/glsa/glsa-200507-20.xml |
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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License |
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======= |
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Copyright 2005 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/2.0 |
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