[ SOURCE: http://www.secureroot.com/security/advisories/9669444023.html ] -----BEGIN PGP SIGNED MESSAGE----- Microsoft Security Bulletin (MS00-059) - -------------------------------------- Patch Available for "Java VM Applet" Vulnerability Originally posted: August 21, 2000 Summary ======= Microsoft has released a patch that eliminates a security vulnerability in the Microsoft(r) virtual machine (Microsoft VM). If a malicious web site operator were able to coax a user into visiting his site, the vulnerability could allow him to masquerade as the user, visit other sites using his identity, and relay the information back to his site. Frequently asked questions regarding this vulnerability and the patch can be found at http://www.microsoft.com/technet/security/bulletin/fq00-059.asp Issue ===== The Microsoft VM is a virtual machine for the Win32(r) operating environment. It runs atop Microsoft Windows(r) 95, 98, or Windows NT(r), or 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. By design, an applet should only be able to communicate with the web site that hosted it. However, this vulnerability would allow an applet to bypass this restriction. If a user visited a web site operated by a malicious user, the site could start an applet that would be able to establish a connection with another web site and forward any information from the web session to the malicious user's site. The session would be established in the guise of the visiting user, rather than that of the malicious user. Thus, the vulnerability could be used to access an intranet site located behind a firewall, access information in the guise of the user, and relay it to the malicious user. The only prerequisite is that the malicious user would need to know or guess the name of the intranet site. Although the applet would be able to make use of the user's credentials to authenticate to the site, this vulnerability would not provide a way to compromise them. 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 3100 series. - All builds in the 3200 series. - All builds in the 3300 series. Patch Availability ================== - All 2000 series Microsoft VM customers: Install Microsoft VM build 2446 - All 3100 series Microsoft VM customers: Upgrade to build 3309 and install the 3314 security patch - 3200 series Microsoft VM customers should do one of the following: All 3200 builds: Upgrade to build 3309 and install the 3314 security patch Builds 3229-3234: Install the security patch from Bulletin MS00-011 before installing this new 3314 security patch Build 3240: Install the 3314 security patch - All 3300 series Microsoft VM customers should install the 3314 security patch 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 MS00-059, http://www.microsoft.com/technet/security/bulletin/fq00-059.asp - Microsoft Knowledge Base (KB) article Q271752 (available soon), discusses this issue in more detail. - 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 ========= August 21, 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 August 21, 2000 (c) 2000 Microsoft Corporation. All rights reserved. Terms of use. -----BEGIN PGP SIGNATURE----- Version: PGP Personal Privacy 6.5.3 iQEVAwUBOaH4W40ZSRQxA/UrAQGNzAf/eeFuOqOc6QroSQfRXiDyj+jdsgBO1vCQ 2YVifqENCRxPUUxmnXooYH+64V++oFbcT2LgE9wZia/eWpJfdWpYylx7gTOtt3zH dZQ7EmIZKFuNKvFQ4XXg8RMp+mF39AHmPhyMcqFOJ7C4XUH1o4vVfC9Pekn+OJJE D1ZAQklHGAHqN30tdzqfEZOOia7qLYkmI/46bkU104alAulBez7QMutLuy5/1AK/ ZMDeG5EG5hnfJ3ypomWopS9bpYDgMzYBQ6xkFxKjBCUFTlJ8brDOOBsDJKP4Wti+ s0XY3qYnl8gCXlePTu2bV0fmYhZf4FJfuVgBbckaYE1DEDmZqPveWg== =Xq6p -----END PGP SIGNATURE----- ******************************************************************* You have received this e-mail bulletin as a result of your registration to the Microsoft Product Security Notification Service. 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