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===========================================================================
             AUSCERT External Security Bulletin Redistribution

           ESB-2001.318 -- Microsoft Security Bulletin MS01-040
        Invalid RDP Data Can Cause Memory Leak in Terminal Services
                               26 July 2001

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                Windows 2000 Terminal Service
                        Windows NT 4.0 Terminal Server Edition
Vendor:                 Microsoft
Operating System:       Windows 2000
                        Windows NT 4.0
Impact:                 Denial of Service
Access Required:        Remote

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- - ----------------------------------------------------------------------
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.



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