The following is a Security Bulletin from the Microsoft Product Security
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Re-release of Patch for "Double Byte Code Page" Vulnerability
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August 20, 1999
Issue
=====
Microsoft has identifed and corrected a regression error in the IIS 4.0
version of the previously-released patch for the "Double Byte Code Page"
vulnerability. The corrected patch has been re-released, and an updated
security bulletin is available at
http://www.microsoft.com/security/bulletins/ms99-022.asp.
Details
=======
Shortly after releasing the patch for the "Malformed HTTP Request Header"
vulnerability (http://www.microsoft.com/Security/Bulletins/ms99-029.asp),
Microsoft discovered a regression error in it. We investigated all
previously-released patches to determine whether any others were affected by
the error, and discovered that one other patch was affected -- the IIS 4.0
version of the patch for the "Double Byte Code Page" vulnerability. On
August 16, 1999, we re-released the patch for the "Malformed HTTP Request
Header" vulnerability, and today are re-releasing the patch for the "Double
Byte Code Page" vulnerability. We have verified that no other security
patches are affected by this vulnerability, and have corrected our code base
to eliminate the error from all future IIS 4.0 releases.
The regression error is completely unrelated to the vulnerabilities, and
does not change our diagnosis of either. The error occurs if the IIS log
file grows to a size that is an exact multiple of 64KB; if this happens, the
server will hang. The problem can be resolved by stopping the IIS service,
starting a new log file, and restarting the IIS service. The regression
error affected only IIS 4.0, and was introduced after Windows NT 4.0 Service
Pack 5.
How to Identify the Re-released Patches
=======================================
- The re-released patches for the "Double Byte Code Page" are
timestamped August 17, 1999. (Please note that the IIS 3.0 patches
were unaffected by the regression error, so they are still
timestamped June 24, 1999).
- The re-released patches for the "Malformed HTTP Request Header"
are timestamped August 12, 1999.
What Customers Should Do
========================
You do not need to take any action if ANY of the following apply to you:
- You are running IIS 3.0.
- You have not installed any IIS 4.0 patches released after
Windows NT 4.0 Service Pack 5.
- You have installed the re-released patch for the "Malformed HTTP
Request Header" vulnerability.
You need to take action if ALL of the following apply to you:
- You applied the original version of either the "Double Byte Code Page"
patch or the "Malformed HTTP Request Header" patch.
- You have not applied the re-released version of either patch.
If you need to take action, you should apply the re-released patches for
either the "Maformed HTTP Request Header" or "Double Byte Code Page"
vulnerabilities. Applying either of the patches will correct the error.
It's not necessary to "back out" either of the original patches; just
download the new version of either patch and install it.
Obtaining Support on this Issue
===============================
This is a fully supported patch. Information on contacting Microsoft
Technical Support is available at
http://support.microsoft.com/support/contact/default.asp.
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