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TITLE:
IBM OS/400 TCP Packet Processing Security Bypass Issue

SECUNIA ADVISORY ID:
SA25885

VERIFY ADVISORY:
http://secunia.com/advisories/25885/

CRITICAL:
Not critical

IMPACT:
Security Bypass

WHERE:
>From remote

OPERATING SYSTEM:
OS/400 4.x
http://secunia.com/product/998/
i5/OS 5.x
http://secunia.com/product/13949/

DESCRIPTION:
A security issue has been reported in IBM OS/400, which potentially
can be exploited by malicious people to bypass certain security
restrictions.

The problem is that TCP SYN packets with the FIN flag set are not
discarded and can be exploited to e.g. bypass certain firewall rules.

SOLUTION:
Apply PTFs. See vendor's advisory for details.

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
http://www-1.ibm.com/support/docview.wss?uid=nas2742405285431729b86256e620067dc17

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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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