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Secunia Research: Novell Client NWSPOOL.DLL Buffer Overflow Vulnerabilities

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                     Secunia Research 29/08/2007

    - Novell Client NWSPOOL.DLL Buffer Overflow Vulnerabilities -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10

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1) Affected Software 

* Novell Client v4.91 SP4 for Windows 2000/XP/2003.

NOTE: Other versions may also be affected.

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2) Severity 

Rating: Moderately critical
Impact: System compromise
        Denial of Service
Where:  Local network

====================================================================== 
3) Vendor's Description of Software 

"The Novell Client workstation software extends the capabilities of
Linux and Windows desktops by providing access to NetWare and Open
Enterprise Server (OES).".

Product Link:
http://www.novell.com/products/clients/

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4) Description of Vulnerability

Secunia Research has discovered multiple vulnerabilities in Novell
Client, which can be exploited by malicious people to cause a DoS
(Denial of Service) or compromise a vulnerable system.

The vulnerabilities are caused due to boundary errors within
NWSPOOL.DLL when processing arguments passed to certain RPC requests
(e.g. RpcAddPrinterDriver and RpcGetPrinterDriverDirectory). These 
can be exploited to cause stack-based buffer overflows via RPC 
requests with specially crafted, overly long arguments.

Successful exploitation allows crashing the service and execution of
arbitrary code.

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5) Solution 

Novell has issued a Field Test File at:
http://download.novell.com/Download?buildid=VOXNZb-6t_g~

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6) Time Table 

09/08/2007 - Vendor notified.
16/08/2007 - Vendor notified about additional vulnerabilities.
16/08/2007 - Vendor response.
29/08/2007 - Public disclosure.

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7) Credits 

Discovered by JJ Reyes, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned 
CVE-2007-2954 for the vulnerabilities.

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9) About Secunia

Secunia offers vulnerability management solutions to corporate
customers with verified and reliable vulnerability intelligence
relevant to their specific system configuration:

http://corporate.secunia.com/

Secunia also provides a publicly accessible and comprehensive advisory
database as a service to the security community and private 
individuals, who are interested in or concerned about IT-security.

http://secunia.com/

Secunia believes that it is important to support the community and to
do active vulnerability research in order to aid improving the 
security and reliability of software in general:

http://corporate.secunia.com/secunia_research/33/

Secunia regularly hires new skilled team members. Check the URL below
to see currently vacant positions:

http://secunia.com/secunia_vacancies/

Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/secunia_security_advisories/ 

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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2007-57/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

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