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ZDI-11-167: Microsoft WINS Service Failed Response Memory Corruption Remote Code Execution Vulnerability
From: ZDI Disclosures <zdi-disclosures () tippingpoint com>
Date: Tue, 10 May 2011 19:49:26 +0000

ZDI-11-167: Microsoft WINS Service Failed Response Memory Corruption Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-167

May 10, 2011

-- CVE ID:
CVE-2011-1248

-- CVSS:
10, (AV:N/AC:L/Au:N/C:C/I:C/A:C)

-- Affected Vendors:
Microsoft

-- Affected Products:
Microsoft OS

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 11154. 
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 Microsoft Windows Internet Name Service
(WINS). Authentication is not required to exploit this vulnerability. 

The specific flaw exists within the wins.exe service distributed with
Microsoft Windows 2003 Server. This service is designed to resolve
NetBIOS requests and accepts connections on port 42. Due to a logic
error when handling a socket send exception, certain user-supplied
values remain within a stack frame and are re-used in another context. A
remote attacker can abuse this flaw to cause a call to
LeaveCriticalSection to operate upon a controlled location in memory.
Such a condition could lead to remote code execution under the context
of the SYSTEM user.

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

http://www.microsoft.com/technet/security/bulletin/MS11-035.mspx

-- Disclosure Timeline:
2011-01-21 - Vulnerability reported to vendor
2011-05-10 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Luigi Auriemma

-- 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.

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