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             AUSCERT External Security Bulletin Redistribution

    Vulnerabilities in WINS Could Allow Remote Code Execution (969883)
                              12 August 2009


        AusCERT Security Bulletin Summary

Product:           Windows Internet Name Service
Publisher:         Microsoft
Operating System:  Microsoft Windows 2000 Server
                   Windows Server 2003
Impact/Access:     Administrator Compromise -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2009-1924 CVE-2009-1923 

Original Bulletin: 

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Microsoft Security Bulletin MS09-039 - Critical

Vulnerabilities in WINS Could Allow Remote Code Execution (969883)

   Published: August 11, 2009

   Version: 1.0

General Information

Executive Summary

   This security update resolves two privately reported vulnerabilities
   in the Windows Internet Name Service (WINS). Either vulnerability
   could allow remote code execution if a user received a specially
   crafted WINS replication packet on an affected system running the WINS
   service. By default, WINS is not installed on any affected operating
   system version. Only customers who manually install this component are
   affected by this issue.

   This security update is rated Critical for all supported editions of
   Microsoft Windows 2000 Server Service Pack 4 and Windows Server 2003.
   For more information, see the subsection, Affected and Non-Affected
   Software, in this section.

   The security update addresses the vulnerabilities by correcting the
   manner in which the WINS service calculates buffer length and
   introducing proper data validations on received packets on the WINS
   server. For more information about the vulnerabilities, see the
   Frequently Asked Questions (FAQ) subsection for the specific
   vulnerability entry under the next section, Vulnerability Information.

   Recommendation. The majority of customers have automatic updating
   enabled and will not need to take any action because this security
   update will be downloaded and installed automatically. Customers who
   have not enabled automatic updating need to check for updates and
   install this update manually. For information about specific
   configuration options in automatic updating, see Microsoft
   Knowledge Base Article 294871.

   For administrators and enterprise installations, or end users who want
   to install this security update manually, Microsoft recommends that
   customers apply the update immediately using update management
   software, or by checking for updates using the Microsoft Update

   Known Issues. None

Affected Software

   Microsoft Windows 2000 Server Service Pack 4
   Windows Server 2003 Service Pack 2
   Windows Server 2003 x64 Edition Service Pack 2
   Windows Server 2003 with SP2 for Itanium-based Systems

Vulnerability Information

WINS Heap Overflow Vulnerability - CVE-2009-1923

   A remote code execution vulnerability exists in the Windows Internet
   Name Service (WINS) due to a buffer overflow caused by incorrect
   calculation of buffer length when processing specially crafted WINS
   network packets. An attacker who successfully exploited this
   vulnerability could take complete control of an affected system. An
   attacker could then install programs; view, change, or delete data; or
   create new accounts.

WINS Integer Overflow Vulnerability - CVE-2009-1924

   A remote code execution vulnerability exists in the default
   configuration of the Windows Internet Name Service (WINS) due to
   insufficient validation of data structures within specially crafted
   WINS network packets received from a trusted WINS replication partner.

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