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UNIRAS Brief - 791/06 - Novell - Netware Client Print Provider Buffer Overflow Vulnerability



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       UNIRAS (UK Government CERT) Briefing - 791/06 Dated 30.11.06 Time 13:15  

UNIRAS is part of NISCC (the UK National Infrastructure Security  Co-ordination Centre)
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 	UNIRAS material is available from the NISCC website at www.niscc.gov.uk
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Title
=====

ZDI-06-043: Novell Netware Client Print Provider Buffer Overflow Vulnerability
            
Detail
======

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.


ZDI-06-043: Novell Netware Client Print Provider Buffer Overflow
            Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-06-043.html
November 29, 2006

- -- CVE ID:
CVE-2006-5854

- -- Affected Vendor:
Novell

- -- Affected Products:
Novell Netware Client 4.91
Novell Netware Client 4.91 SP1
Novell Netware Client 4.91 SP2

- -- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this vulnerability since July  7, 2005 by Digital Vaccine protection filter
ID 3583. For further product information on the TippingPoint IPS:

    http://www.tippingpoint.com 

- -- Vulnerability Details:
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.

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

- -- 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

- -- Credit:
This vulnerability was discovered by an anonymous researcher.

- -- About the Zero Day Initiative (ZDI):
Established by TippingPoint, a division of 3Com, The Zero Day Initiative
(ZDI) represents a best-of-breed model for rewarding security researchers for responsibly disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research through the ZDI can find more information and sign-up at:

    http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is used.
3Com does not re-sell the vulnerability details or any exploit code.
Instead, upon notifying the affected product vendor, 3Com provides its customers with zero day protection through its intrusion
prevention technology. Explicit details regarding the specifics of the vulnerability are not exposed to any parties until an
official vendor patch is publicly available. Furthermore, with the altruistic aim of helping to secure a broader user base, 3Com
provides this vulnerability information confidentially to security vendors (including competitors) who have a vulnerability
protection or mitigation product.


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UNIRAS wishes to acknowledge the contributions of ZDI and 3Com for the information contained 

in this briefing.
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This notice contains information released by the original author. Some of the information may have changed since it was released. If
the vulnerability affects you, it may be prudent to retrieve the advisory from the site of the original source to ensure that you
receive the most current information concerning that problem.

Reference to any specific commercial product, process, or service by trade name, trademark manufacturer, or otherwise, does not
constitute or imply its endorsement, recommendation, or favouring by UNIRAS or NISCC. The views and opinions of authors expressed
within this notice shall not be used for advertising or product endorsement purposes.

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UNIRAS is a member of the Forum of Incident Response and Security Teams (FIRST) and has contacts with other international Incident
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<End of UNIRAS Briefing>



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