Secunia Security Advisory - A security issue has been reported in Shorewall, which can be exploited by malicious people to bypass certain security restrictions.
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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.
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Please Note:
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Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.
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