Microsoft KB Archive/322298

= MS02-026: Unchecked buffer in ASP.NET worker process (Japanese) =

Article ID: 322298

Article Last Modified on 8/15/2006

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APPLIES TO


 * Microsoft ASP.NET 1.0
 * Microsoft .NET Framework 1.0

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This article was previously published under Q322298



SYMPTOMS
A buffer overrun vulnerability exists in Microsoft ASP.NET. An attacker who was able to successfully exploit this vulnerability could cause the application that is running on the Web server to restart. Additionally, although Microsoft has not been able to demonstrate it, an attacker could exploit this vulnerability to cause code to run on the Web server. The code could run in the security context of the ASP.NET worker process (Aspnet_wp.exe), which uses an unprivileged account by default.

This vulnerability affects only ASP.NET applications that use StateServer mode to manage session state information. StateServer mode is not the default mode. Finally, this vulnerability affects only those applications that use StateServer mode and that also use cookies. This vulnerability does not affect applications that use StateServer mode without cookies.



CAUSE
This vulnerability occurs because a function that processes cookie data in the ASPState service cannot properly check the length of the cookies that are passed to it.



RESOLUTION
To resolve this problem, obtain the latest service pack for the Microsoft .NET Framework 1.0. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

318836 How to obtain the latest .NET Framework service pack

Security update information
A supported security update is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that you determine are at risk of attack. Evaluate your computer's physical accessibility, network and Internet connectivity, and other factors to determine the degree of risk to your computer. See the associated Microsoft Security Bulletin to help determine the degree of risk. This security update may receive additional testing. If your computer is sufficiently at risk, we recommend that you apply this security update now.

To resolve this problem immediately, download the security update by following the instructions later in this article or contact Microsoft Product Support Services to obtain the security update. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

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
This security update requires Microsoft .NET Framework 1.0 Service Pack 1.

Download information
To download the security update for this problem, visit the following Microsoft Web site:

http://msdn.microsoft.com/netframework/downloads/updates/asphotfix.asp

Release Date: June 6, 2002

For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.

Installation options
The following command-line command installs the security update without any user intervention and does not force the computer to restart:

ndp10_qfem_q322298_ja.exe /Q

Warning Before you use this installation method, see the &quot;Installation issues&quot; section. Note that your computer is vulnerable until you restart it.

Installation issues
For additional information about installation issues with this security update, click the following article number to view the article in the Microsoft Knowledge Base:

324292 Installation issues with silent install of security bulletin MS02-026

File information
The following files are copied to the %WINDIR%\Microsoft.NET\Framework\v1.0.3705\ folder:   Version       File name ---  1.0.3705.272  Aspnet_isapi.dll 1.0.3705.272 Aspnet_wp.exe 1.0.3705.272 Aspnet_regiis.exe --       Aspnet_perf.ini --       Aspnet_perf2.ini 1.0.3705.272 System.Web.dll The following files are copied to the %WINDIR%\Microsoft.NET\Framework\v1.0.3705\ASP.NETClientFiles\ folder:   Version  File name ---  --       SmartNavIE5.js   --       SmartNav.js



STATUS
Microsoft has confirmed that this problem may cause a degree of security vulnerability in Microsoft ASP.NET.

This problem was corrected in the Microsoft .NET Framework 1.0 Service Pack 2.



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

http://www.microsoft.com/technet/security/bulletin/MS02-026.asp

The localized security updates for this vulnerability (MS02-026) have different Microsoft Knowledge Base (KB) numbers. The KB number and the corresponding language of the localized security updates appear in the following table.

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

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional query words: security_patch

Keywords: kbbug kbfix kbnetframe100presp2fix kbqfe kbsecbulletin kbsechack kbsecurity kbsecvulnerability KB322298

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