__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Microsoft Virtual Machine (VM) Vulnerability [Microsoft Security Bulletin MS03-011] April 9, 2003 22:00 GMT Number N-074 ______________________________________________________________________________ PROBLEM: There is a flaw in the way the Microsoft VM ByteCode Verifier conducts its checks when it is loading code. It does not check correctly for a particular illegal sequence of byte codes. A malicious Java applet could be used to take advantage of this missing check and bypass subsequent security checks. AFFECTED SOFTWARE: Microsoft VM - all builds up to and including build 5.0.3809. DAMAGE: A remote attacker could potentially gain privileges of the victim (including root) and execute arbitrary code. SOLUTION: Administrators should install build 3810 or later of the Microsoft VM, as discussed in their Security Bulletin. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. The victim would need to visit a website ASSESSMENT: under the attacker's control or receive an HTML e-mail from the attacker. Automatic exploitation by an HTML e-mail would be blocked by Outlook Express 6.0 and Outlook 2000 in their default configurations, and by Outlook 98 and 2000 if used in conjunction with the Outlook Email Security Update. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-074.shtml ORIGINAL BULLETIN: http://www.microsoft.com/technet/treeview/default.asp?url= /technet/security/bulletin/MS03-011.asp ______________________________________________________________________________ [***** Start Microsoft Security Bulletin MS03-011 *****] Microsoft Security Bulletin MS03-011 Flaw in Microsoft VM Could Enable System Compromise (816093) Originally posted: April 09, 2003 Summary Who should read this bulletin: Customers using Microsoft® Windows®. Impact of vulnerability: Allow attacker to execute code of his or her choice. Maximum Severity Rating: Critical Recommendation: Customers should install build 3810 or later of the Microsoft VM, as discussed below End User Bulletin: An end user version of this bulletin is available at: http://www.microsoft.com/security/security_bulletins/ms03-011.asp Affected Software: Versions of the Microsoft virtual machine (Microsoft VM) are identified by build numbers, which can be determined using the JVIEW tool as discussed in the FAQ. All builds of the Microsoft VM up to and including build 5.0.3809 are affected by these vulnerabilities. Technical details Technical description: The Microsoft VM is a virtual machine for the Win32® operating environment. The Microsoft VM is shipped in most versions of Windows (a complete list is available in the FAQ), as well as in most versions of Internet Explorer. The present Microsoft VM, which includes all previously released fixes to the VM, has been updated to include a fix for the newly reported security vulnerability. This new security vulnerability affects the ByteCode Verifier component of the Microsoft VM, and results because the ByteCode verifier does not correctly check for the presence of certain malicious code when a Java applet is being loaded. The attack vector for this new security issue would likely involve an attacker creating a malicious Java applet and inserting it into a web page that when opened, would exploit the vulnerability. An attacker could then host this malicious web page on a web site, or could send it to a user in e-mail Mitigating factors: In order to exploit this vulnerability via the web-based attack vector, the attacker would need to entice a user into visiting a web site that the attacker controlled. The vulnerability themselves provide no way to force a user to a web site. Java applets are disabled within the Restricted Sites Zone. As a result, any mail client that opened HTML mail within the Restricted Sites Zone, such as Outlook 2002, Outlook Express 6, or Outlook 98 or 2000 when used in conjunction with the Outlook Email Security Update, would not be at risk from the mail-based attack vector. The vulnerability would gain only the privileges of the user, so customers who operate with less than administrative privileges would be at less risk from the vulnerability. Corporate IT administrators could limit the risk posed to their users by using application filters at the firewall to inspect and block mobile code. Severity Rating: Microsoft VM Critical The above assessment is based on the types of systems affected by the vulnerability, their typical deployment patterns, and the effect that exploiting the vulnerability would have on them. Vulnerability identifier: CAN-2003-0111 Tested Versions: Microsoft tested VM builds 5.0.3802 and later to assess whether they are affected by these vulnerabilities. Previous versions are no longer supported, and may or may not be affected by these vulnerabilities. Patch availability Download locations for this patch Download locations for this patch The patch is available to update existing Microsoft VMs via the Windows Update web site. For Windows 2000 Service Packs 2 & 3 only, the patch is also available at: All except Japanese NEC NEC Japanese Note: A version of the patch that can be downloaded and deployed throughout a network is available. Information on obtaining it is available in the FAQ. Additional information about this patch Installation platforms: The new VM build can be installed to update Microsoft VMs on the following versions of Windows: Microsoft Windows 95 Microsoft Windows 98 and 98SE Microsoft Windows Millennium Microsoft Windows NT 4.0, beginning with Service Pack 1 Windows 2000 Service Pack 2 or Service Pack 3 Microsoft Windows XP Gold or Service Pack 1. Inclusion in future service packs: The fixes included in this build will be included in all future VM builds. Reboot needed: Yes Patch can be uninstalled: No Superseded patches: The new VM build supersedes all builds prior to and including 5.0.3809. It includes fixes for all issues discussed in the following Microsoft security bulletins: MS99-031 MS99-045 MS00-011 MS00-059 MS00-075 MS00-081 MS02-013 MS02-052 MS02-069 Verifying patch installation: Knowledge Base article 816093 provides information to verify that you've installed the patch. Note: Regardless of the version number viewed from Jview, the registry key described in the above article should be the determining factor for proper installation of this patch Caveats: None Localization: Localized versions of this patch are available at the locations discussed in “Patch Availability”. Obtaining other security patches: Patches for other security issues are available from the following locations: Security patches are available from the Microsoft Download Center, and can be most easily found by doing a keyword search for "security_patch". Patches for consumer platforms are available from the WindowsUpdate web site Other information: Support: Microsoft Knowledge Base article 816093 discusses this issue and will be available approximately 24 hours after the release of this bulletin. Knowledge Base articles can be found on the Microsoft Online Support web site. Technical support is available from Microsoft Product Support Services. There is no charge for support calls associated with security patches. Security Resources: The Microsoft TechNet Security Web Site provides additional information about security in Microsoft products. Disclaimer: 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. Revisions: V1.0 (April 09, 2003): Bulletin Created. [***** End Microsoft Security Bulletin MS03-011 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Microsoft for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. 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