From secnotif@MICROSOFT.COM Wed Jul 25 21:16:28 2001 From: Microsoft Product Security To: MICROSOFT_SECURITY@ANNOUNCE.MICROSOFT.COM Date: Wed, 25 Jul 2001 18:08:04 -0700 Subject: Microsoft Security Bulletin MS01-040 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----- - ---------------------------------------------------------------------- Title: Invalid RDP Data Can Cause Memory Leak in Terminal Services Date: 25 July 2001 Software: Windows 2000 Server and Windows NT 4.0, Terminal Server Edition Impact: Denial of Service Bulletin: MS01-040 Microsoft encourages customers to review the Security Bulletin at: http://www.microsoft.com/technet/security/bulletin/MS01-040.asp. - ---------------------------------------------------------------------- Issue: ====== The Windows 2000 Terminal Service and Windows NT 4.0 Terminal Server Edition contains a memory leak in one of the functions that processes incoming Remote Data Protocol data via port 3389. Each time an RDP packet containing a specific type of malformation is processed, the memory leak depletes overall server memory by a small amount. If an attacker sent a sufficiently large quantity of such data to an affected machine, he could deplete the machine's memory to the point where response time would be slowed or the machine's ability to respond would be stopped altogether. All system services would be affected, including but not limited to terminal services. Normal operation could be restored by rebooting the machine. Mitigating Factors: ==================== - Normal firewalling could be used to prevent an attacker from exploiting this vulnerability from the Internet. Specifically, blocking port 3389 would prevent an attacker from delivering data to the affected service, thereby preventing him from exploiting the vulnerability. - There is no capability to compromise data or usurp privileges via the vulnerability. Patch Availability: =================== - A patch is available to fix this vulnerability. Please read the Security Bulletin http://www.microsoft.com/technet/security/bulletin/ms01-040.asp for information on obtaining this patch. Acknowledgment: =============== - Peter Grundl - --------------------------------------------------------------------- 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. -----BEGIN PGP SIGNATURE----- Version: PGP Personal Privacy 6.5.3 iQEVAwUBO19tdI0ZSRQxA/UrAQGNJwf+MJnDs9PaXT1OfGsVYI7FP+G0jgGzX8UX h7WPalpJyPv+bA0f4Gh7bARLZOz7xmGTLnE+jLfEqWmM9sRSGPkJNp6zoSVW5UjT tS2IGpH8o5RXO2wZbbaEW+Er5Lct5HMB2UvUzjkBB0H8+ErcLVuIxX9j1T7mcW8E FG8PS982cfkTwFDsTFlA0CW1TKx/ASo2kBSecK5OeoYldA98WGB2Yg9ftOOdc6gO 7QaXKLFzYsdD/WKsoKdvXdCZepelLTiwMNHaRgRmXgs6lzMLDfRC++i25sU1JwBX xtj2GAQxLZZEIip4OzgtRltg/wjGpfC6eaGVoqxwmGNlETg1Q6pbzg== =X91Y -----END PGP SIGNATURE----- ******************************************************************* You have received this e-mail bulletin as a result of your registration to the Microsoft Product Security Notification Service. You may unsubscribe from this e-mail notification service at any time by sending an e-mail to MICROSOFT_SECURITY-SIGNOFF-REQUEST@ANNOUNCE.MICROSOFT.COM The subject line and message body are not used in processing the request, and can be anything you like. To verify the digital signature on this bulletin, please download our PGP key at http://www.microsoft.com/technet/security/notify.asp. For more information on the Microsoft Security Notification Service please visit http://www.microsoft.com/technet/security/notify.asp. For security-related information about Microsoft products, please visit the Microsoft Security Advisor web site at http://www.microsoft.com/security.