GLSA-200507-20 : Shorewall: Security policy bypass

This script is Copyright (C) 2005-2014 Tenable Network Security, Inc.


Synopsis :

The remote Gentoo host is missing one or more security-related
patches.

Description :

The remote host is affected by the vulnerability described in GLSA-200507-20
(Shorewall: Security policy bypass)

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).

See also :

http://www.shorewall.net/News.htm#20050717
http://www.gentoo.org/security/en/glsa/glsa-200507-20.xml

Solution :

All Shorewall users should upgrade to the latest available version:
# emerge --sync
# emerge --ask --oneshot --verbose net-firewall/shorewall

Risk factor :

High / CVSS Base Score : 7.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P)

Family: Gentoo Local Security Checks

Nessus Plugin ID: 19282 (gentoo_GLSA-200507-20.nasl)

Bugtraq ID:

CVE ID: CVE-2005-2317