__________________________________________________________
The U.S. Department of Energy
Computer Incident Advisory Center
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INFORMATION BULLETIN
FrontPage Sub-Component Vulnerability
[Microsoft Security Bulletin MS01-035]
June 25, 2001 19:00 GMT Number L-100
______________________________________________________________________________
PROBLEM: Microsoft's Visual Studio Remote Application Deployment (RAD)
Support has a buffer overflow vulnerability.
PLATFORM: Those that have RAD installed on IIS 4.0 or IIS 5.0 web
servers.
DAMAGE: An attacker could use the vulnerability to load and execute
artibrary code on the server in the IUSR_machine context and
possibly in the SYSTEM context.
SOLUTION: Remove RAD from the server, or apply the patch as directed.
______________________________________________________________________________
VULNERABILITY The risk is LOW. RAD is not installed by default onto the
ASSESSMENT: server. The installation process raises a warning that RAD
should not be installed on production systems. The warning must
be actively acknowledged for RAD to be installed.
______________________________________________________________________________
[Start Microsoft Advisory]
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.
[End Microsoft Advisory]
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Microsoft for the
information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Center, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.
CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
Voice: +1 925-422-8193 (7x24)
FAX: +1 925-423-8002
STU-III: +1 925-423-2604
E-mail: ciac@ciac.org
Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.
World Wide Web: http://www.ciac.org/
Anonymous FTP: ftp.ciac.org
PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins. If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
Incident Response and Security Teams (FIRST) is a world-wide
organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at http://www.first.org/.
This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
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disclosed, or represents that its use would not infringe privately
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