Microsoft KB Archive/321123

= MS02-018: Patch Available for Buffer Overrun in ASP Server-Side Include Function Vulnerability =

Article ID: 321123

Article Last Modified on 11/21/2006

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APPLIES TO


 * Microsoft Internet Information Services 5.1
 * Microsoft Internet Information Services 5.0
 * Microsoft Internet Information Server 4.0

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This article was previously published under Q321123



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



SYMPTOMS
A buffer overrun vulnerability exists in Internet Information Server 4.0 and Internet Information Services 5.0 and 5.1. By sending a specially chosen request to an affected Web server, an attacker might either disrupt Web services or gain the ability to run a program on the server. Such a program would run with full system permissions in Internet Information Server 4.0, and with fewer, but still significant, permissions in Internet Information Services 5.0 and 5.1.

Customers who have used the IIS Lockdown Tool to configure their servers as static Web servers are already protected against this vulnerability. The URLScan tool, if it was deployed with the default rule set, would also make it hard to use the vulnerability to gain control of the server, and would likely reduce the vulnerability to only a denial-of-service attack.



CAUSE
This vulnerability occurs because of a logic error in a function that handles server-side file includes for ASP pages. The result of the logic error is that the function might determine that it is safe to store the name of a specified server-side file in a particular buffer, when in actuality the file name is longer than the buffer.



Internet Information Services 5.1
The update for this problem is included in the &quot;MS02-018: April 2002 Cumulative Patch for Internet Information Services.&quot; For additional information about how to obtain this patch, click the article number below to view the article in the Microsoft Knowledge Base:

319733 MS02-018: April 2002 Cumulative Patch for Internet Information Services

Internet Information Services 5.0
The update for this problem is included in the &quot;MS02-018: April 2002 Cumulative Patch for Internet Information Services.&quot; For additional information about how to obtain this patch, click the article number below to view the article in the Microsoft Knowledge Base:

319733 MS02-018: April 2002 Cumulative Patch for Internet Information Services

Internet Information Server 4.0
The update for this problem is included in the &quot;MS02-018: April 2002 Cumulative Patch for Internet Information Services.&quot; For additional information about how to obtain this patch, click the article number below to view the article in the Microsoft Knowledge Base:

319733 MS02-018: April 2002 Cumulative Patch for Internet Information Services



Internet Information Services 5.1
Microsoft has confirmed that this problem may cause a degree of security vulnerability in Microsoft Internet Information Services 5.1.

Internet Information Services 5.0
Microsoft has confirmed that this problem may cause a degree of security vulnerability in Microsoft Internet Information Services 5.0.

Internet Information Server 4.0
Microsoft has confirmed that this problem may cause a degree of security vulnerability in Microsoft Internet Information Server 4.0.



MORE INFORMATION
For more information about this vulnerability, visit the following Microsoft Web site:

http://www.microsoft.com/technet/security/bulletin/MS02-018.mspx

For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:

265173 Datacenter Program and Windows 2000 Datacenter Server Product

For additional information on how to install multiple hotfixes with only one reboot, click the article number below to view the article in the Microsoft Knowledge Base:

296861 Use QChain.exe to Install Multiple Hotfixes with One Reboot

Additional query words: kbIIS400500510April2002Rollup security_patch

Keywords: kbbug kbfix kbwin2000presp3fix kbwin2000sp3fix kbsecurity KB321123

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