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List:       bugtraq
Subject:    Microsoft Security Bulletin (MS99-022)
From:       aleph1 () UNDERGROUND ! ORG
Date:       1999-06-25 17:18:46
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The following is a Security  Bulletin from the Microsoft Product Security
Notification Service.

Please do not  reply to this message,  as it was sent  from an unattended
mailbox.
                    ********************************

Microsoft Security Bulletin (MS99-022)
--------------------------------------

Patch Available for "Double Byte Code Page" Vulnerability

Originally Posted: June 24, 1999

Summary
=======
Microsoft has released a patch that eliminates a vulnerability in
Microsoft(r) Internet  Information Server that could allow a web site
visitor to view the source code for selected files  on the server, if the
server's default language is set to Chinese, Japanese or Korean.

Frequently asked questions regarding this vulnerability can be found
at http://www.microsoft.com/security/bulletins/MS99-022faq.asp

Issue
=====
When IIS is run on a machine on which a double-byte character set code page
is used (i.e., the  default language on the server is set to Chinese,
Japanese, or Korean), and a specific URL  construction is used to request a
file in a virtual directory, normal server-side processing is  bypassed. As
a result, the file is simply delivered as text to the browser, thereby
allowing the  source code to be viewed.

Affected Software Versions
==========================
 - Microsoft Internet Information Server 3.0 and 4.0, if run on a server
   whose default language is set to Chinese, Korean, or Japanese

Patch Availability
==================
 - English: ftp://ftp.microsoft.com/bussys/iis/iis-public/
   fixes/usa/security/fesrc-fix
 - Simplified Chinese: ftp://ftp.microsoft.com/bussys/iis/iis-public/
   fixes/chs/security/fesrc-fix
 - Traditional Chinese: ftp://ftp.microsoft.com/bussys/iis/iis-public/
   fixes/cht/security/fesrc-fix
 - Japanese: ftp://ftp.microsoft.com/bussys/iis/iis-public/
   fixes/jpn/security/fesrc-fix
 - Korean: ftp://ftp.microsoft.com/bussys/iis/iis-public/
   fixes/kor/security/fesrc-fix

NOTE: Line breaks have inserted into the above URLs for readability

NOTE: Apply the patch corresponding to the language version of IIS, rather
than the current  default language on the server. For example, if you have
the English version of IIS but have  reset the default language on the
server to Chinese, apply the English patch.

More Information
================
Please see the following references for more information related to this
issue.
 - Microsoft Security Bulletin MS99-022: Frequently Asked Questions,
   http://www.microsoft.com/security/bulletins/MS99-022faq.asp.
 - Microsoft Knowledge Base (KB) article Q233335,
   "Page Contents Visible When Certain Characters are at End of URL",
   http://support.microsoft.com/support/kb/articles/q233/3/35.asp.
   (Note: It may take 24 hours from the original posting of this bulletin
   for the KB article to be visible; however, a copy will be immediately
   available in the patch folder)
 - Microsoft Security Advisor web site,
   http://www.microsoft.com/security/default.asp.
 - IIS Security Checklist,
   http://www.microsoft.com/security/products/iis/CheckList.asp.

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.

Revisions
=========
 - June 24, 1999: Bulletin Created.


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