COMMAND RTF Control SYSTEMS AFFECTED - Microsoft Windows 95 - Microsoft Windows 98 - Microsoft Windows 98 Second Edition - Microsoft Windows NT 4.0 Workstation - Microsoft Windows NT 4.0 Server - Microsoft Windows NT 4.0 Server, Enterprise Edition - Microsoft Windows NT 4.0 Server, Terminal Server Edition PROBLEM Following is based on Security Bulletin from the Microsoft. RTF files consist of text and control information. The control information is specified via directives called control words. The default RTF reader that ships as part of many Windows platforms has an unchecked buffer in the portion of the reader that parses control words. If an RTF file contains a specially-malformed control word, it could cause the application to crash. Microsoft believes that this is a denial of service vulnerability only, and that there is no capability to use this vulnerability to run arbitrary code. The most serious risk from this vulnerability would result if a user had preview mode enabled on a mail program like Outlook, and received an email that exploited the vulnerability. Because preview mode causes the mail to be parsed without user assent, the mail program would continue to crash until a subsequent mail was received or the mail program was started with preview mode disabled. SOLUTION Windows 2000 is not affected by this vulnerability. Patch availability: - Windows 95: http://www.microsoft.com/windows95/downloads/contents/WUCritical/rtfcontrol/default.asp - Window 98: http://www.microsoft.com/windows98/downloads/contents/WUCritical/rtfcontrol/default.asp - Windows NT 4.0 Workstation, Windows NT 4.0 Server, and Windows NT 4.0 Server, Enterprise Edition: Intel: http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17510 Alpha: http://www.microsoft.com/Downloads/Release.asp?ReleaseID=17511 - Windows NT 4.0 Server, Terminal Server Edition: To be released shortly. The Windows 95 and 98 versions of the patch will also be available via WindowsUpdate shortly. When this happens, we will modify the bulletin to note this fact.