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Category:   Application (Multimedia)  >   Microsoft Visual Studio Vendors:   Microsoft
Microsoft Visual Studio Could Allow Users to Crash the Debugger or to Execute Code on the Server
SecurityTracker Alert ID:  1001172
SecurityTracker URL:  http://securitytracker.com/id/1001172
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Mar 28 2001
Impact:   Denial of service via network, Execution of arbitrary code via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.0 Enterprise Edition
Description:   Microsoft issued a bulletin (MS01-018) announcing a vulnerability in Visual Studio that could result in limited denial of service conditions or could cause arbitrary code to be executed with the privileges of the logged-on user.

The VB-TSQL debugger object that ships with Visual Studio 6.0 Enterprise Edition fails to check a buffer in the code that processes parameters for one of the object's methods. Because the object can be programmatically accessed remotely, the object could be referenced by a program that contained malformed data within the parameter to exploit the vulnerability.

This could cause the object to crash or could cause arbitrary code to be executed on the host with the privileges of the logged-on user.

The vendor notes that Visual Studio 6.0 Professional Edition is not affected.

Impact:   A remote user with network access to the debugger object could cause the object to crash or could cause arbitrary code to be executed on the host with the privileges of the logged-on user.
Solution:   The vendor has released a patch. See the vendor bulletin for more information.
Vendor URL:  www.microsoft.com/technet/security/bulletin/MS01-018.asp (Links to External Site)
Cause:   Boundary error
Underlying OS:  Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  Microsoft Security Bulletin MS01-018


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:      Visual Studio VB-TSQL Object Contains Unchecked Buffer
Date:       27 March 2001
Software:   Visual Studio 6.0 Enterprise Edition
Impact:     Run code of attacker's choice
Bulletin:   MS01-018

Microsoft encourages customers to review the Security Bulletin at: 
http://www.microsoft.com/technet/security/bulletin/MS01-018.asp.
- ----------------------------------------------------------------------

Issue:
======

The VB-TSQL debugger object that ships with Visual Studio 6.0
Enterprise Edition has an  unchecked buffer in the code that
processes parameters for one of the object's methods.  Theobject can,
by design, be programmatically accessed remotely. If the object were
to be  referenced by a program that contained specially malformed
data within the parameter,  eitherof two outcomes would result. In
the less serious case, the attacker could cause the  object to fail
on the hosting machine. In the more serious case, the attacker could
exploit  the buffer overrun to run code of the attacker's choice on
the hosting machine. 

The debugger object (vbsdicli.exe) is installed by default with
Visual Studio 6.0 Enterprise  Edition and runs in the context of the
interactively logged-on user. The attacker could only  execute a
successful attack if he knew that a user had the component installed
and that the  user was logged in at the time of the attack. 

Mitigating Factors:
===================

 - If best practices have been followed and ports 137-139 and 445
have
   been blocked at an organization's router or firewall, this attack
   could not be executed from the Internet.

 - There is no way to determine remotely if a machine has the
affected
   component installed. An attacker would need to successively target
   machines until he found one that was susceptible.

 - The vulnerability could only be exploited if an interactive user
   were logged on to the target machine at the time of the malicious
   user's attack.

 - Only the Enterprise Edition of Visual Studio 6.0 is affected.
   Visual Studio 6.0 Professional Edition is not affected.

Patch Availability:
===================

 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletin
   http://www.microsoft.com/technet/security/bulletin/ms01-018.asp
   for information on obtaining this patch.

Acknowledgment:
===============

 - BindView's Razor Team (http://razor.bindview.com)

- ---------------------------------------------------------------------

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
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OR LIMITATION OF LIABILITY FOR  CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.

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   *******************************************************************
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To verify the digital signature on this bulletin, please download our PGP
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