ZDI-07-045: Novell Client NWSPOOL.DLL Stack Overflow Vulnerability

From: zdi-disclosures@3com.com
To: full-disclosure@lists.grok.org.uk,bugtraq@securityfocus.com,vulnwatch@vulnwatch.org,vulndiscuss@vulnwatch.org
Cc: zdi-disclosures@3com.com
Subject: ZDI-07-045: Novell Client NWSPOOL.DLL Stack Overflow Vulnerability

ZDI-07-045: Novell Client NWSPOOL.DLL Stack Overflow Vulnerability
August  6, 2007

-- CVE ID:
Pending Assignment

-- Affected Vendor:

-- Affected Products:
Novell Netware Client

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability since July 30, 2007 by Digital Vaccine protection
filter ID 5262, 5266. For further product information on the TippingPoint 


-- 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. Several RPC
functions exposed by this DLL do not properly verify argument sizes and
subsequently copy user-supplied data to a stack-based buffer resulting
in an exploitable overflow.

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


-- Disclosure Timeline:
2007.02.16 - Vulnerability reported to vendor
2007.07.30 - Digital Vaccine released to TippingPoint customers
2007.08.06 - Coordinated public release of advisory

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

-- About the Zero Day Initiative (ZDI):
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(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:


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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