[NT] Novell Netware Client Print Provider Buffer Overflow Vulnerability

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Novell Netware Client Print Provider Buffer Overflow Vulnerability
------------------------------------------------------------------------


SUMMARY

This vulnerability allows remote attackers to execute arbitrary code on
systems with vulnerable installations of the Novell Netware Client.
Authentication is not required to exploit this vulnerability.

DETAILS

Affected Products:
* Novell Netware Client version 4.91
* Novell Netware Client version 4.91 SP1
* Novell Netware Client version 4.91 SP2

The specific flaw exists in a print provider installed by the Netware
Client. The nwspool.dll library does not properly handle long arguments to
the Win32 EnumPrinters() and OpenPrinter() functions. Exceeding 458 bytes
in the first argument to OpenPrinter() or 524 bytes in the second argument
to EnumPrinters() results in an exploitable buffer overflow within the
Spooler service.

This vulnerability can be exploited remotely via Remote Procedure Call
(RPC) requests to the Spooler service. The Spooler exposes the "spoolss"
named pipe, which allows an anonymous user to issue certain spooler
commands. These include the OpenPrinter() and EnumPrinters() calls
required to exploit this vulnerability.

Vendor Response:
Novell has issued an update to correct this vulnerability. More details
can be found at:
<http://www.novell.com/support/search.do?cmd=displayKC&externalId=3125538&sliceId=SAL_Public> Novell TID #3125538

Disclosure Timeline:
2005.07.07 - Digital Vaccine released to TippingPoint customers
2006.10.02 - Vulnerability reported to vendor
2006.11.29 - Coordinated public release of advisory

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5854>
CVE-2006-5854


ADDITIONAL INFORMATION

The information has been provided by <mailto:zdi-disclosures@xxxxxxxx>
Zero Day Initiative.
The original article can be found at:
<http://www.zerodayinitiative.com/advisories/ZDI-06-043.html>
http://www.zerodayinitiative.com/advisories/ZDI-06-043.html



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