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

           ESB-2001.249 -- Microsoft Security Bulletin MS01-035
    FrontPage Server Extension Sub-Component Contains Unchecked Buffer
                               25 June 2001

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

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

Product:                FrontPage Server Extensions
Vendor:                 Microsoft
Operating System:       Windows NT
                        Windows 2000
Platform:               IIS 4.0
                        IIS 5.0
Impact:                 Execute Arbitrary Code/Commands
Access Required:        Remote

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- - ----------------------------------------------------------------------
Title:      FrontPage Server Extension Sub-Component Contains
            Unchecked Buffer
Date:       21 June 2001
Software:   Microsoft Visual Studio RAD Support in FrontPage
            Server Extensions 
Impact:     Run code of attacker's choice
Bulletin:   MS01-035

Microsoft encourages customers to review the Security Bulletin at: 
http://www.microsoft.com/technet/security/bulletin/MS01-035.asp.
- - ----------------------------------------------------------------------

Issue:
======
FrontPage Server Extensions ship as part of IIS 4.0 and 5.0, and
facilitate the development of 
Web sites and Web-based applications. FrontPage Server Extensions
includes an additional, 
optional sub-component called Visual Studio RAD (Remote Application
Deployment) Support. 
This sub-component allows Visual InterDev 6.0 users to register and
unregister COM objects on 
an IIS 4.0 or 5.0 Server. This sub-component contains an unchecked
buffer in a section that 
processes input information. 
An attacker could exploit this vulnerability against any server with
this sub-component installed by 
establishing a web session on with the server and passing a specially
malformed packet to the 
server component. The attacker could use that packet to thereby load
code of his choice for 
execution on the server. An attack that exploits this vulnerability
would execute in the 
IUSR_machinename context (see Q142868). However, it is possible under
certain circumstances 
to execute code in the SYSTEM context. 

It is important to note that this feature is not installed by default
with FPSE. It is also not installed 
by default on either of IIS 4.0 or 5.0. Also, when the feature is
selected during installation, a 
warning message is raised alerting the administrator that this
feature should not be installed on 
production machines, especially if the production machine has
Internet access. This is because 
this feature is only intended for facilitating internal development.
The administrator must 
acknowledge the warning to successfully install the feature. 

Mitigating Factors:
====================
 - While FrontPage Server Extensions installs by default with IIS, 
   Visual Studio RAD Deployment Support coordination is not 
   provided with FPSE by default on an initial installation of
   IIS. Installation must be selected and approved by the user
   in charge of the server using the IIS setup process. If a user
   selects this sub-component during an initial installation, a
   warning is raised stating that this should not be installed
   on a production system. Users must actively acknowledge this
   warning to complete the installation. 

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletin
   http://www.microsoft.com/technet/security/bulletin/ms01-035.asp
   for information on obtaining this patch.

Acknowledgment:
===============
 - Nsfocus (http://www.nsfocus.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
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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