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TITLE:
Shorewall Rules / Policies Bypass Security Issue

SECUNIA ADVISORY ID:
SA16087

VERIFY ADVISORY:
http://secunia.com/advisories/16087/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
>From local network

SOFTWARE:
Shorewall 2.4.x
http://secunia.com/product/5400/
Shorewall 2.0.x
http://secunia.com/product/3666/
Shorewall 2.2.x
http://secunia.com/product/5399/

DESCRIPTION:
A security issue has been reported in Shorewall, which can be
exploited by malicious people to bypass certain security
restrictions.

The security issue is caused due to an error that allows a client
that has already been authenticated based on its MAC address to
bypass all other configured rules and policies.

Successful exploitation requires MACLIST_TTL to be configured to a
value greater than 0 or MACLIST_DISPOSITION to be configured as
"ACCEPT" . 

The security issue has been reported in versions 2.0.x, 2.2.x and
2.4.x.

SOLUTION:
Update to the fixed version of firewall script.

Version 2.4.x:
http://shorewall.net/pub/shorewall/2.4/shorewall-2.4.1/errata/firewall

Version 2.2.x:
http://shorewall.net/pub/shorewall/2.2/shorewall-2.2.5/errata/firewall

Version 2.0.x:
http://shorewall.net/pub/shorewall/errata/2.0.17/firewall

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Supernaut.

ORIGINAL ADVISORY:
http://shorewall.net/News.htm#20050717

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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