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Vulnerability of Novell Client: privilege elevation via NWFILTER.SYS

Synthesis of the vulnerability 

A local attacker can execute code in the kernel via a vulnerability of NWFILTER.SYS.
Vulnerable systems: Novell Client.
Severity of this threat: 2/4.
Creation date: 13/11/2007.
Revision date: 14/11/2007.
Références of this weakness: 3260263, BID-26420, CVE-2007-5667, VIGILANCE-VUL-7340.

Description of the vulnerability 

The %systemroot%\System32\netware\NWFILTER.SYS driver filters queries for network resources (UNC Path Filter) in order to not create redundant connections.

This driver creates the "\.\nwfilter" named pipe. However, all users can open it and send IOCTLs. These IOCTLs do not check if received addresses are user space addresses. An attacker can therefore provide a kernel address in order to force the driver to write to this address, and thus to corrupt memory.

A local attacker can therefore elevate his privileges.
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This security bulletin impacts software or systems such as Novell Client.

Our Vigil@nce team determined that the severity of this cybersecurity announce is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this vulnerability alert.

Solutions for this threat 

Novell Client: patch for NWFILTER.SYS.
A patch is available:
  Novell Client 4.91 SP4:
    http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5006982.html
  Novell Client 4.91 SP3:
    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:
    http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5006983.html

Novell Client: version Vista SP1.
Version Vista SP1 is corrected:
  http://download.novell.com/Download?buildid=hJolpJeVDqU~

Novell Client: version XP/2003 4.91 SP5.
Version 4.91 SP5 is corrected:
  http://download.novell.com/Download?buildid=qmMAWSRy5q4~
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