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Microsoft Security Bulletin (MS00-037)
From: secnotif () MICROSOFT COM (Microsoft Product Security)
Date: Fri, 2 Jun 2000 17:29:27 -0700
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. ******************************** -----BEGIN PGP SIGNED MESSAGE----- Microsoft Security Bulletin (MS00-037) - -------------------------------------- Patch Available for "HTML Help File Code Execution" Vulnerability Originally posted: June 02, 2000 Summary ======= Microsoft has released a patch that eliminates a security vulnerability in the HTML Help facility that ships with Microsoft(r) Internet Explorer. Under certain conditions, the vulnerability could allow a malicious web site to take inappropriate action on the computer of a visiting user. Frequently asked questions regarding this vulnerability and the patch can be found at http://www.microsoft.com/technet/security/bulletin/fq00-037.asp Issue ===== The HTML Help facility provides the ability to launch code via shortcuts included in HTML Help files. If a compiled HTML Help (.chm) file were referenced by a malicious web site, it could potentially be used to launch code on a visiting user's computer without the user's approval. Such code could take any actions that the user could take, including adding, changing or deleting data, or communicating with a remote web site. A web site could only invoke an HTML Help file if it resided on a UNC share accessible from the user's machine, or on the user's machine itself. A firewall that blocks Netbios would prevent the former case from being exploited. Adhering to standard security practices would prevent the latter. In addition, an HTML Help file could only be invoked if Active Scripting was permitted in the Security Zone that the malicious user's site resides in. The patch eliminates the vulnerability by only allowing an HTML Help file to use shortcuts if the help file resides on the local machine. Affected Software Versions ========================== - Microsoft Internet Explorer 4.0 - Microsoft Internet Explorer 4.01 - Microsoft Internet Explorer 5.0 - Microsoft Internet Explorer 5.01 Patch Availability ================== - Internet Explorer 4.0, 4.01, 5.0, or 5.01 running on Windows 95, Windows 98, Windows 98 Second Edition, or Windows NT 4.0: http://www.microsoft.com/Downloads/Release.asp?ReleaseID=21705 - Internet Explorer 5.01 on Windows 2000: http://www.microsoft.com/Downloads/Release.asp?ReleaseID=21706 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 MS00-037, http://www.microsoft.com/technet/security/bulletin/fq00-037.asp - Microsoft Knowledge Base article Q259166 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 Technical Support is available at http://support.microsoft.com/support/contact/default.asp Revisions - June 02, 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. Last Updated June 02,2000 (c) 2000 Microsoft Corporation. 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