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Novell Client NWFILTER.SYS Privilege Escalation Vulnerability
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Secunia Advisory:
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SA27678
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Release Date:
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2007-11-13
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Last Update:
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2007-11-14
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Critical:
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Less critical
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Impact:
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Privilege escalation
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Where:
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Local system
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Solution Status:
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Vendor Workaround
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| Software: | Novell Client for Windows NT/2000/XP 4.x
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| | CVE reference: | CVE-2007-5667 (Secunia mirror)
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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/Readme...ment/patchbuilder/readme_5006982.html
Novell Client 4.91 SP3 (491psp3_nwfilter.zip):
http://support.novell.com/docs/Readme...ment/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/Readme...ment/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/Kan...blishing/98/3260263_f.SAL_Public.html
iDefense:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=626
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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