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ZDI-10-090: Novell ZENworks Configuration Management Preboot Service Remote Code Execution Vulnerability
From: ZDI Disclosures <zdi-disclosures () tippingpoint com>
Date: Tue, 1 Jun 2010 12:00:13 -0500

ZDI-10-090: Novell ZENworks Configuration Management Preboot Service Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-10-090
June 1, 2010

-- Affected Vendors:
Novell

-- Affected Products:
Novell Zenworks

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 9755. 
For further product information on the TippingPoint IPS, visit:

    http://www.tippingpoint.com

-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Novell ZENworks. Authentication is not
required to exploit this vulnerability.

The specific flaw exists within the Preboot Service (novell-pbserv.exe).
This service listens for incoming connections on TCP port 998. The
service uses a simple binary protocol where the first DWORD is an opcode
followed by the specific opcode's data, typically in length/value pairs.
These length values are not checked against the destination buffers size
allowing for stack-based overflows to occur. This can lead 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://www.novell.com/support/search.do?cmd=displayKC&amp;docType=kc&amp;externalId=7005572&amp;sliceId=1&amp;docTypeID=DT_TID_1_1&amp;dialogID=138523325&amp;stateId=0%200%20138517923

-- Disclosure Timeline:
2010-02-09 - Vulnerability reported to vendor
2010-06-01 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Stephen Fewer of Harmony Security (www.harmonysecurity.com)

-- 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. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint 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, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

    http://www.zerodayinitiative.com/advisories/disclosure_policy/

Follow the ZDI on Twitter:

    http://twitter.com/thezdi
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