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 (MS99-049) -------------------------------------- Patch Available for "File Access URL" Vulnerability Originally Posted: November 12, 1999 Summary ======= Microsoft has released a patch that eliminates a vulnerability in Microsoft Windows 95 or Windows 98. The vulnerability could allow a malicious web site or e-mail message to cause the Windows machine to crash, or to run arbitrary code. Frequently asked questions regarding this vulnerability can be found at http://www.microsoft.com/security/bulletins/MS99-049faq.asp. Issue ===== There is a buffer overflow in the Windows 95 and Windows 98 networking software that processes file name strings. If the networking software were provided with a very long random string as input, it could crash the machine. If provided with a specially-malformed argument, it could be used to run arbitrary code on the machine via a classic buffer overrun attack. The vulnerability could be exploited remotely in cases where a file:// URL or a Universal Naming Convention (UNC) string on a remote web site included a long file name or where a long file name was included in an e-mail message. Affected Software Versions ========================== The buffer overrun is present in the networking software in all versions of Windows 95 and Windows 98. Patch Availability ================== - Windows 95: http://download.microsoft.com/download/win95/update/245729/ w95/en-us/245729us5.exe - Windows 98: http://download.microsoft.com/download/win98/update/245729/ w98/en-us/245729us8.exe NOTE: Line breaks have been inserted into the above URLs for readability. More Information ================ Please see the following references for more information related to this issue. - Microsoft Security Bulletin MS99-049: Frequently Asked Questions, http://www.microsoft.com/security/bulletins/MS99-049faq.asp. - Microsoft Knowledge Base (KB) article Q245729, Windows 95 and 98 File Access URL Update, http://support.microsoft.com/support/kb/articles/q245/7/29.asp. (Note: It may take 24 hours from the original posting of this bulletin for the KB article to be visible.) - Microsoft Security Advisor web site, http://www.microsoft.com/security/default.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. Acknowledgments =============== Microsoft acknowledges UNYUN, the Shadow Penguin Security Research Group of Japan for bringing this issue to our attention. Revisions ========= - November 12, 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. © 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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