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Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200507-20] Shorewall: Security policy bypass

Vulnerability Assessment Details

[GLSA-200507-20] Shorewall: Security policy bypass

Vulnerability Assessment Summary
Shorewall: Security policy bypass

Detailed Explanation for this Vulnerability Assessment
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 permiting 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).

References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-2317
http://www.shorewall.net/News.htm#20050717

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

Network Security Threat Level: Low

Networks Security ID:

Vulnerability Assessment Copyright: (C) 2005 Michel Arboi

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