From secnotif@MICROSOFT.COM Wed Oct 25 20:10:05 2000 From: Microsoft Product Security Resent-From: mea culpa To: MICROSOFT_SECURITY@ANNOUNCE.MICROSOFT.COM Resent-To: jericho@attrition.org Date: Wed, 25 Oct 2000 14:12:29 -0700 Subject: Microsoft Security Bulletin (MS00-081) 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 (MS00-081) - -------------------------------------- Patch Available for New Variant of "VM File Reading" Vulnerability Originally posted: October 25, 2000 Summary ======= Microsoft has released a patch that eliminates a security vulnerability in the Microsoft(r) virtual machine (Microsoft VM) that originally was discussed in Microsoft Security Bulletin MS00-011. Like the original vulnerability, the new variant could enable a malicious web site operator to read files from the computer of a person who visited his site or read web content from inside an intranet if the malicious site was visited by a computer from within that intranet. Frequently asked questions regarding this vulnerability and the patch can be found at http://www.microsoft.com/technet/security/bulletin/fq00-081.asp Issue ===== The Microsoft VM is a virtual machine for the Win32(r) operating environment. It runs atop Microsoft Windows(r) 95, 98, Me, Windows NT(r) 4.0, and Windows 2000. It ships as part of each operating system, and also as part of Microsoft Internet Explorer. The version of the Microsoft VM that ships with Microsoft Internet Explorer 4.x and Internet Explorer 5.x contains a security vulnerability that could allow a Java applet to operate outside the bounds set by the sandbox. A malicious user could write a Java applet that could read - but not change, delete or add - files from the computer of a person who visited his site or read web content from inside an intranet if the malicious site is visited by a computer from within that intranet. The vulnerability at issue here is a new variant of the vulnerability originally discussed in Microsoft Security Bulletin MS00-011. The only significant difference between the new and original variants lies in the specific programming technique used to exploit the vulnerability; in other respects, the two are virtually identical. Applying the new patch eliminates both the new and original variants. Affected Software Versions ========================== Versions of the Microsoft VM are identified by build numbers, which can be determined using the JVIEW tool, as discussed in the FAQ. The following builds of the Microsoft VM are affected: - All builds in the 2000 series. - All builds in the 3000 series. Note: The Microsoft VM ships as part of several products. However, the primary ship vehicle is Internet Explorer. Patch Availability ================== New versions of the Microsoft VM that include a fix for the vulnerability can be downloaded from the following locations: - 2000-series builds: A patch specifically for the 2000-series builds will be available shortly. Customers who wish to eliminate the vulnerability can also do so by upgrading to build 3319 at http://www.microsoft.com/java/vm/dl_vm40.htm - 3000-series: Upgrade to build 3319 or later at http://www.microsoft.com/java/vm/dl_vm40.htm. Note: 2000-series builds are shipped as part of Internet Explorer 4.x; 3000 series builds are shipped as part of Internet Explorer 5.x. However, customers may upgrade the Microsoft VM on their machines independent of the browser, and the Microsoft VM also ships as part of many other applications, so it is possible for the actual build number to be higher than the one associated with the version of IE that is installed on the machine. In such cases, customers should determine what version of the patch to install based on the build number, not on the version of IE. 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 MS00-081, http://www.microsoft.com/technet/security/bulletin/fq00-081.asp - Microsoft Security Bulletin MS00-011, http://www.microsoft.com/technet/security/bulletin/ms00-011.asp. - Microsoft Knowledge Base article Q277014 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 ========= - October 25, 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 October 25, 2000 (c) 2000 Microsoft Corporation. All rights reserved. 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