__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Microsoft Visual FoxPro 6.0 Vulnerability [Microsoft Security Bulletin MS02-049] September 5, 2002 20:00 GMT Number M-120 ______________________________________________________________________________ PROBLEM: A flaw has been identified that could enable a web page to launch the Visual FoxPro 6.0 application on a user's machine without the normal Internet Explorer warning received beforehand. AFFECTED Microsoft Visual FoxPro 6.0 SOFTWARE: DAMAGE: Impact to a user's machine ranges from an attacker being able to load and run programs to reformatting the hard drive. SOLUTION: Apply Microsoft's patch or upgrade to FoxPro 7.0. ______________________________________________________________________________ VULNERABILITY The risk is LOW. The most privileges the application could gain ASSESSMENT: would be those of the user. The filename to be launched would have to be constructed in a particular format. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/m-120.shtml ORIGINAL BULLETIN: http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS02-049.asp PATCHES: http://www.microsoft.com/downloads/Release.asp?ReleaseID=42297 ______________________________________________________________________________ [***** Start Microsoft Security Bulletin MS02-049 *****] Summary Who should read this bulletin: Customers using Microsoft® Visual FoxPro 6.0 Impact of vulnerability: Attacker could gain control over user’s system. Maximum Severity Rating: Moderate. Recommendation: Customers using Visual FoxPro 6.0 should install the patch immediately. Affected Software: Microsoft Visual FoxPro 6.0 Technical details Technical description: In general, when an product installs, it should register itself with Internet Explorer. This allows the product to specify how Internet Explorer should handle files associated with it when referenced from a web page – for instance, it allows the product to specify whether the user should be presented with a warning dialogue before such a file is opened. Visual FoxPro 6.0 does not perform this registration, and this gives rise to a situation in which a web page could automatically launch a Visual FoxPro application (i.e., an .app file). In most cases, this would not result in a security vulnerability – because of the way Visual FoxPro 6.0 evaluates file names, FoxPro itself could be started but the .app file would typically not run. However, if the filename of the application were constructed in a particular way, a second error (associated with how Visual FoxPro 6.0 evaluates application filenames) could not only start FoxPro but allow the application to execute. The vulnerability could be exploited by creating a web page that references a Visual FoxPro application, and either hosting it on a web site or sending it to a user as an HTML mail. If the user had installed Visual FoxPro 6.0 – or had installed a product that includes the Visual FoxPro 6.0 runtime – and the filename of the application was constructed in a particular way, the application would execute. This would enable the application to not only interrogate databases, but also issue system commands in the user’s security context. Mitigating factors: The vulnerability could only be exploited if Visual FoxPro 6.0 (or the Visual FoxPro 6.0 runtime) is installed on the system. Other products, and other versions of Visual FoxPro, are not affected by the vulnerability. The most privileges the application could gain would be those of the user. If the user were operating in a less-privileged context, it would limit the damage that the application could cause. Severity Rating: Internet Servers Intranet Servers Client Systems Visual FoxPro 6.0 Low Low Moderate 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: CVE-CAN-2002-0696 Tested Versions: Microsoft tested Visual FoxPro 6.0 and 7.0 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 Microsoft Visual FoxPro 6.0: http://www.microsoft.com/downloads/Release.asp?ReleaseID=42297 Additional information about this patch Installation platforms: This patch can be installed on systems running Visual FoxPro 6.0. here are no service pack requirements. Inclusion in future service packs: No additional service packs are planned for Visual FoxPro 6.0. Reboot needed: No Patch can be uninstalled: No Superseded patches: None. Verifying patch installation: To verify that the patch has been installed on the machine, confirm that the following registry key has been created on the machine: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\VFPODBC\Q326568 To verify the individual files, use the date/time and version information provided in the file manifest in Knowledge Base article Q326568 Caveats: The localized versions of the patch contain a minor error in the EULA and the completion dialog, which results in random characters being displayed in both. These errors do not affect the effectiveness of the patch -- they are display errors only. Microsoft will release shortly updated versions of the patches that do not contain the errors. 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: Acknowledgments Microsoft thanks Cristobal Bielza and Juan Carlos G. Cuartango from Instituto Seguridad Internet (http://www.instisec.com) for reporting this issue to us and working with us to protect customers. Support: Microsoft Knowledge Base article Q326568 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 a ssociated 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 (September 04, 2002): Bulletin Created. [***** End Microsoft Security Bulletin MS02-049 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Microsoft Corporation 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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