Security Advisory SA27678 - Novell Client NWFILTER.SYS Privilege Escalation Vulnerability

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Secunia Advisory SA27678

Novell Client NWFILTER.SYS Privilege Escalation Vulnerability

Secunia Advisory

SA27678

Release Date

2007-11-13

Last Update

2008-11-17

Popularity

12,646 views

Comments

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Criticality level

Less critical

Impact

Privilege escalation

Where

Local system

Authentication level

This information is available to Secunia VIM customers

Report reliability

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Solution Status

Vendor Patch

Systems affected

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Approve distribution

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Software:

Novell Client for Windows NT/2000/XP 4.x

Secunia CVSS Score

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CVE Reference(s)

CVE-2007-5667 CVSS score available to Secunia VIM customers

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
Update to version 4.91 Support Pack 5.
Further details available to Secunia VIM customers

Provided and/or discovered by
Stephen Fewer of Harmony Security, reported via iDefense Labs.

Changelog
Further details available to Secunia VIM customers

Original Advisory
Novell:
http://www.novell.com/support/viewContent.do?externalId=3260263
http://www.novell.com/support/viewContent.do?externalId=7000668

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

Deep Links
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Novell Client NWFILTER.SYS Privilege Escalation Vulnerability

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Secunia Advisory SA27678

Novell Client NWFILTER.SYS Privilege Escalation Vulnerability

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