Users who do not have the appropriate permissions can receive restricted content from ISA Server 2004 (894679)


The information in this article applies to:

  • Microsoft Internet Security and Acceleration Server 2004, Standard Edition

SYMPTOMS

After you enable the "Content requiring user authentication for retrieval" cache rule in Microsoft Internet Security and Acceleration (ISA) Server 2004, the ISA Server computer caches content that is requested by users who are permitted to retrieve that content. However, users who do not have permissions to access that particular content can still request and receive this content from the ISA Server computer.

CAUSE

By default, ISA Server 2004 does not cache content that is requested by authenticated users. However, if you enable the "Content requiring user authentication for retrieval cache" rule, ISA Server caches content that is requested by authenticated users. Then, ISA Server serves the cached content for all future requests without verifying access permissions.

RESOLUTION

Service pack information

To resolve this problem, obtain the latest service pack for Internet Security and Acceleration Server 2004. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

891024 How to obtain the latest ISA Server 2004 service pack

Hotfix Information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next ISA Server 2004 service pack that contains this hotfix.

To resolve this problem immediately, 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 ISA Server 2004 Standard Edition Service Pack 1 (SP1) installed before you apply this hotfix.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

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.
   Date         Time   Version            Size    File name
   -----------------------------------------------------------
   01-Apr-2005  17:20  4.0.2163.254      647,440  W3filter.dll

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Internet Security and Acceleration Server 2004 Service Pack 2.

MORE INFORMATION

After you apply this hotfix, ISA Server may return an error. This error indicates that the page that you requested has expired. This behavior occurs if any one of the following conditions is true:
  • You configure the ISA Server computer to retrieve content from the cache, regardless of whether the content is still valid or not.
  • The client request specifies that expired content that is returned by the ISA Server is acceptable.
To resolve this issue, use one of the following methods:
  • Block the "max-stale" HTTP header field.

    For more information about HTTP filtering in ISA Server 2004, visit the following Microsoft Web site:

    http://www.microsoft.com/technet/prodtechnol/isa/2004/plan/httpfiltering.mspx

  • Configure the ISA Server computer to prevent it from retrieving expired cache content. To do this, click the following option on the Contents Retrieval page in the New Cache Rule Wizard:

    Only if a valid version of the object exists in cache. If no valid version exists, route the request to the server.

For more information about how to install ISA Server 2004 hotfixes and updates, click the following article number to view the article in the Microsoft Knowledge Base:

885957 How to install ISA Server hotfixes and updates

Modification Type:MinorLast Reviewed:10/12/2006
Keywords:kbfix kbbug kbHotfixServer KB894679 kbAudITPRO
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