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AUSCERT External Security Bulletin Redistribution
ESB-2000.215 -- Microsoft Security Bulletin (MS00-058)
Patch Available for "Specialized Header" Vulnerability
17 August 2000
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AusCERT Security Bulletin Summary
---------------------------------
Product: Internet Information Server
Vendor: Microsoft
Operating System: Windows 2000
Platform: N/A
Impact: Access Privileged Data
Access Required: Remote
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Microsoft Security Bulletin (MS00-058)
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Patch Available for "Specialized Header" Vulnerability
Originally posted: August 14, 2000
Summary
=======
Microsoft has released a patch that eliminates a security
vulnerability in Internet Information Server that ships with
Microsoft(r) Windows 2000. Under certain conditions, the
vulnerability could cause a web server to send the source code of
certain types of web files to a visiting user.
Frequently asked questions regarding this vulnerability and the patch
can be found at
http://www.microsoft.com/technet/security/bulletin/fq00-058.asp
Issue
=====
If an IIS server receives a file request that contains a specialized
header as well as one of several particular characters at the end,
the expected ISAPI extension processing may not occur. The result is
that the source code of the file would be sent to the browser.
It is important to note that normal security recommendations militate
strongly against ever including sensitive information in .ASP files
and, if these recommendations have been followed, there would be no
sensitive information to compromise. The specialized header at issue
here cannot be created via a standard Internet browser, so the
request would need to be created by an alternate method.
Affected Software Versions
==========================
- Microsoft Internet Information Server 5.0
Patch Availability
==================
- http://www.microsoft.com/Downloads/Release.asp?ReleaseID=23769
Note: This vulnerability is eliminated by installing Windows 2000
Service Pack 1
http://www.microsoft.com/windows2000/downloads/recommended/sp1/
We recommend that customers apply SP1 as the preferred option for
eliminating this vulnerability, as it has been fully regression
tested and includes fixes for additional issues.
Note: Additional security patches are available at the Microsoft
Download Center
More Information
================
Please see the following references for more information related to
this issue.
- Frequently Asked Questions: Microsoft Security Bulletin MS00-058,
http://www.microsoft.com/technet/security/bulletin/fq00-058.asp
- Microsoft Knowledge Base article Q256888 discusses this issue
and will be available soon.
- Microsoft TechNet Security web site,
http://www.microsoft.com/technet/security/default.asp
- Obtaining Support on this Issue
- This is a fully supported patch. Information on contacting
Microsoft Product Support Services is available at
http://support.microsoft.com/support/contact/default.asp.
Revisions
=========
August 14, 2000: Bulletin Created.
- - --------------------------------------------------------
THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED
"AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL
WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY
DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO
THE FOREGOING LIMITATION MAY NOT APPLY.
(c) 2000 Microsoft Corporation. All rights reserved. Terms of use.
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