Microsoft KB Archive/831225

= FIX: MS03-041 may prevent SSL connections =

Article ID: 831225

Article Last Modified on 3/31/2006

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APPLIES TO


 * Microsoft Internet Information Server 4.0

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We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 6.0 running on Microsoft Windows Server 2003. IIS 6.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:

http://www.microsoft.com/technet/security/prodtech/IIS.mspx



SUMMARY
After you apply the MS03-041 security update to a computer that is running Microsoft Windows NT 4.0 Server and Microsoft Internet Information Server (IIS) 4.0, clients may not be able to reach Web sites by using HTTPS.



CAUSE
If a certificate without an enhanced key usage (EKU) extension exists on an IIS computer, the certificate is not included in the certification authority list that is sent to client. The certificate is not included because the version of Schannel.dll that is included with IIS 4.0 does not have the new EKU calling convention that the hotfix version of Crypt32.dll has.



RESOLUTION
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites
You must have the MS03-041 security update installed on your computer before you install this hotfix. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

823182 MS03-041: Vulnerability in Authenticode verification could allow remote code execution

Restart requirement
We recommend that you restart IIS after you apply this hotfix.

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.



STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the &quot;Applies to&quot; section.

Keywords: kbfix kbiis400fix kbqfe kbhotfixserver KB831225

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