Message-ID: <OFAB274459.ABC46A8C-ON882573EC.007B13E5-862573EC.007C732A@3com.com>
Date: Mon, 11 Feb 2008 16:39:19 -0600
From: zdi-disclosures@...m.com
To: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com
Subject: ZDI-08-005: Novell Client NWSPOOL.DLL
 EnumPrinters Stack Overflow Vulnerability

ZDI-08-005: Novell Client NWSPOOL.DLL EnumPrinters Stack Overflow 
Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-08-005.html
February 11, 2008

-- CVE ID:
CVE-2008-0639

-- Affected Vendor:
Novell

-- Affected Products:
Novell Netware Client

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID . 
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 nwspool.dll which is responsible for
handling RPC requests through the spoolss named pipe. The EnumPrinters
function exposed by this DLL contains a logical flaw allowing an
attacker to bypass a patch introduced to prevent the vulnerability
described in ZDI-07-045. Exploitation of this vulnerability leads to
arbitrary code execution in the context of the SYSTEM user.

-- Vendor Response:
Novell has issued an update to correct this vulnerability. More details
can be found at:

http://download.novell.com/Download?buildid=SszG22IIugM~

-- Disclosure Timeline:
2007.12.11 - Vulnerability reported to vendor
2008.02.11 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by Anonymous and Avosani Gabriele.

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, 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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