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TITLE:
Novell Client NWFILTER.SYS Privilege Escalation Vulnerability

SECUNIA ADVISORY ID:
SA27678

VERIFY ADVISORY:
http://secunia.com/advisories/27678/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

REVISION:
1.1 originally posted 2007-11-13

SOFTWARE:
Novell Client for Windows NT/2000/XP 4.x
http://secunia.com/product/1516/

DESCRIPTION:
A vulnerability has been reported in Novell Client, which can be
exploited by malicious, local users to gain escalated privileges.

Insufficient address space verification within the IOCTL handlers of
the NWFILTER.SYS device driver and insecure permissions on the
"\.\nwfilter" device can be exploited e.g. to access certain IOCTL
handlers and overwrite arbitrary memory, and execute code with kernel
privileges.

The vulnerability affects version 4.91 Support Pack 1 to Support Pack
4 and is reported in nwfilter.sys in file version 4.91.1.1.

SOLUTION:
The vendor has provided a package, which disables the NWFILTER.SYS
driver. Please see the vendor's advisory for more details.

Novell Client 4.91 SP4 (491psp4_nwfilter.zip):
http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5006982.html

Novell Client 4.91 SP3 (491psp3_nwfilter.zip):
http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5006862.html

Novell Client 4.91, 4.91 SP1, 4.91 SP1a and 4.91 SP2
(491presp3_nwfilter.zip):
http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5006983.html

PROVIDED AND/OR DISCOVERED BY:
Stephen Fewer of Harmony Security, reported via iDefense Labs.

CHANGELOG:
2007-11-14: Updated "Description" and added link to iDefense Labs.

ORIGINAL ADVISORY:
Novell:
https://secure-support.novell.com/KanisaPlatform/Publishing/98/3260263_f.SAL_Public.html

iDefense:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=626

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