Microsoft KB Archive/890621

= Workaround for the vulnerability in the Indexing Service that could allow remote code execution =

Article ID: 890621

Article Last Modified on 2/23/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Web Edition
 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
 * Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Professional
 * Microsoft Windows XP Professional

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INTRODUCTION
A vulnerability in the Indexing Service could allow remote code execution. This vulnerability involves specially formed queries that are longer than 62 characters. Security update 871250 addresses this vulnerability. This article describes a technique that will help prevent an attacker from trying to exploit this vulnerability on computers that do not have security update 871250 applied.



MORE INFORMATION
The operating system software development kit (SDK) includes sample code (Query.asp) for querying the Indexing Service. Query.asp uses Microsoft Internet Information Services (IIS) and the Indexing Service's IXSSO query object. The lines in bold in the following example demonstrate additional code that can be added to Query.asp to limit query length. This additional code will help prevent attempts to exploit this vulnerability. You can update other operating system SDK sample query pages in a similar manner. if right(SearchString, 1) = chr(34) then SrchStrLen = SrchStrLen-1 SearchString = left(SearchString, SrchStrLen) end if

SrchStrLen = len( SearchString ) if SrchStrLen > 60 then SrchStrLen = 60 SearchString = left( SearchString, 60 ) end if

if Advanced<> &quot;on&quot; then CompSearch = &quot;{freetext} &quot; & SearchString & &quot;{/freetext}&quot; else CompSearch = SearchString end if

set Q = Server.CreateObject(&quot;ixsso.Query&quot;) set Util = Server.CreateObject(&quot;ixsso.Util&quot;)

For additional information about security update 871250, click the following article number to view the article in the Microsoft Knowledge Base:

871250 MS05-003: Vulnerability in the Indexing Service could allow remote code execution

Keywords: kbhowto kbinfo kbsecurity kbadmin kbexpertiseadvanced KB890621

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