MS02-010: Unchecked Buffer in ISAPI Filter May Allow Commerce Server Compromise

A Commerce Server Web site may fail with an access violation. Drwtsn32 reports and logs the process failure.

By default, Commerce Server 2000 installs a dynamic-link library (DLL) with an ISAPI filter that allows the server to provide extended functionality in response to events on the server. This filter, called AuthFilter, provides support for a variety of authentication methods. Commerce Server 2000 can also be configured to use other authentication methods.

A security vulnerability results because AuthFilter contains an unchecked buffer in a section of code that handles certain types of authentication requests. An attacker who provides authentication data that overruns the buffer may cause the Commerce Server process to fail, or may run code in the security context of the Commerce Server process. The process runs with LocalSystem privileges, so exploiting the vulnerability may give the attacker complete control of the server.

This update is available as a separate download or as part of Commerce Server 2000 Service Pack 3 (SP3). For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

Individual Update

The following files are available for download from the Microsoft Download Center:
Release Date: Feb-21-2002

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

The English version of this update has the file attributes (or later) 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. Note Because of file dependencies, this update may contain additional files.

Important To install this update, you must have Microsoft Commerce Server 2000 Service Pack 2 (SP2) installed. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

Microsoft has confirmed that this problem may cause a degree of security vulnerability in Commerce Server 2000. This problem was first corrected in Commerce Server 2000 Service Pack 3 (SP3).

For more information on this vulnerability, see the following Microsoft Web site: