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. ------------------------------------------------------------------------- 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) 1999 Microsoft Corporation. All rights reserved. Terms of Use. ******************************************************************* You have received this e-mail bulletin as a result of your registration to the Microsoft Product Security Notification Service. You may unsubscribe from this e-mail notification service at any time by sending an e-mail to MICROSOFT_SECURITY-SIGNOFF-REQUESTat_private The subject line and message body are not used in processing the request, and can be anything you like. For more information on the Microsoft Security Notification Service please visit http://www.microsoft.com/security/services/bulletin.asp. For security-related information about Microsoft products, please visit the Microsoft Security Advisor web site at http://www.microsoft.com/security.
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