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Microsoft Security Bulletin MS99-039 - Critical

Patch Available for "Domain Resolution" and "FTP Download" Vulnerabilities

Published: September 23, 1999 | Updated: March 21, 2003

Version: 2.0

Patch Availability Information Updated: March 21, 2003
Originally Posted: September 23, 1999
Revised: September 30, 1999

Summary

Microsoft has released a patch that eliminates two security vulnerabilities in Microsoft® Internet Information Server (IIS) 4.0 and Microsoft Commercial Internet System (MCIS) 2.5. The vulnerabilities allow security restrictions in IIS and MCIS to be bypassed under certain conditions, as discussed below. Frequently asked questions regarding this vulnerability can be found at /technet/security/bulletin/fq99-039.mspx.

Issue

There are two vulnerabilities at issue here:

  • IIS 4.0 provides the ability to restrict access to a web site based on the user's domain. However, if IIS cannot resolve a user's IP address to a domain, it will grant the user's first request for a session. It will correctly deny them thereafter. This vulnerability affects IIS 4.0 only; it does not any other Microsoft product, including MCIS.
  • A user who accesses an FTP site via a browser will be able to download files even if they are marked No Access. This vulnerability is due to a regression error that was introduced in hotfixes released after Windows NT 4.0 Service Pack 5; it does not exist in SP5 or in previous versions. This vulnerability affects both IIS 4.0 and MCIS 2.5, but no other Microsoft products.

Neither vulnerability provides a means to usurp control of the server. A patch is available that eliminates both vulnerabilities.

Affected Software Versions

  • Microsoft Internet Information Server 4.0
  • Microsoft Commercial Internet System 2.5

Vulnerability Identifiers

Patch Availability

More Information

Please see the following references for more information related to this issue.

Obtaining Support on this Issue

This is a fully supported patch. Information on contacting Microsoft Technical Support is available at http://support.microsoft.com/contactussupport/?ws=support.

Acknowledgments

Microsoft acknowledges Rich Harrison of Halliburton Company for discovering the "Domain Resolution" vulnerability and reporting it to us. Microsoft acknowledges Roberto Franceschetti for discovering the FTP Access vulnerability and bringing it to our attention.

Revisions

  • September 23, 1999: Bulletin Created.
  • September 30, 1999: Bulletin modified to include information regarding MCIS association with this vulnerability.
  • V2.0 (March 21, 2003): Introduced versioning and updated patch availability information.

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