Zhen-Xjell
February 21st, 2002, 11:30 PM
-----BEGIN PGP SIGNED MESSAGE-----
- ----------------------------------------------------------------------
Title: * * *Unchecked Buffer in ISAPI Filter Could Allow Commerce
* * * * * *Server Compromise
Date: * * * 21 February 2002
Software: * Commerce Server 2000
Impact: * * Run code of attacker's choice.
Max Risk: * Critical
Bulletin: * MS02-010
Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS02-010.asp.
- ----------------------------------------------------------------------
Issue:
======
By default, Commerce Server 2000 installs a .dll with an ISAPI
filter that allows the server to provide extended functionality in
response to events on the server. This filter, called AuthFilter,
provides support for a variety of authentication methods.
Commerce Server 2000 can also be configured to use other
authentication methods.
A security vulnerability results because AuthFilter contains an
unchecked buffer in a section of code that handles certain types
of authentication requests. An attacker who provided
authentication data that overran the buffer could cause the
Commerce Server process to fail, or could run code in the
security context of the Commerce Server process. The
process runs with LocalSystem privileges, so exploiting the
vulnerability would give the attacker complete control of
the server.
Mitigating Factors:
====================
- Although Commerce Server 2000 does rely on IIS for its base
* web services, the AuthFilter ISAPI filter is only available
* as part of Commerce Server. Customers using IIS are at no
* risk from this vulnerability.
- The URLScan tool, if deployed using the default ruleset for
* Commerce Server, would make it difficult if not impossible
* for an attacker to exploit the vulnerability to run code,
* by significantly limiting the types of data that could be
* included in an URL. It would, however, still be possible
* to conduct denial of service attacks.
- An attacker's ability to extend control from a compromised
* web server to other machines would depend heavily on the
* specific configuration of the network. Best practices recommend
* that the network architecture account for the inherent high-risk
* that machines in an uncontrolled environment, like the Internet,
* face by minimizing overall exposure though measures like DMZ's,
* operating with minimal services and isolating contact with
* internal networks. Steps like this can limit overall exposure
* and impede an attacker's ability to broaden the scope of a
* possible compromise.
- While the ISAPI filter is installed by default, it is not loaded
* on any web site by default. It must be enabled through the
* Commerce Server Administration Console in the Microsoft
* Management Console (MMC).
Risk Rating:
============
- Internet systems: Critical
- Intranet systems: Critical
- Client systems: None
Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read the
* Security Bulletin at
* http://www.microsoft.com/technet/security/bulletin/ms02-010.asp
* for information on obtaining this patch.
- ---------------------------------------------------------------------
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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*******************************************************************
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For security-related information about Microsoft products, please *visit the Microsoft Security Advisor web site at http://www.microsoft.com/security.
- ----------------------------------------------------------------------
Title: * * *Unchecked Buffer in ISAPI Filter Could Allow Commerce
* * * * * *Server Compromise
Date: * * * 21 February 2002
Software: * Commerce Server 2000
Impact: * * Run code of attacker's choice.
Max Risk: * Critical
Bulletin: * MS02-010
Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS02-010.asp.
- ----------------------------------------------------------------------
Issue:
======
By default, Commerce Server 2000 installs a .dll with an ISAPI
filter that allows the server to provide extended functionality in
response to events on the server. This filter, called AuthFilter,
provides support for a variety of authentication methods.
Commerce Server 2000 can also be configured to use other
authentication methods.
A security vulnerability results because AuthFilter contains an
unchecked buffer in a section of code that handles certain types
of authentication requests. An attacker who provided
authentication data that overran the buffer could cause the
Commerce Server process to fail, or could run code in the
security context of the Commerce Server process. The
process runs with LocalSystem privileges, so exploiting the
vulnerability would give the attacker complete control of
the server.
Mitigating Factors:
====================
- Although Commerce Server 2000 does rely on IIS for its base
* web services, the AuthFilter ISAPI filter is only available
* as part of Commerce Server. Customers using IIS are at no
* risk from this vulnerability.
- The URLScan tool, if deployed using the default ruleset for
* Commerce Server, would make it difficult if not impossible
* for an attacker to exploit the vulnerability to run code,
* by significantly limiting the types of data that could be
* included in an URL. It would, however, still be possible
* to conduct denial of service attacks.
- An attacker's ability to extend control from a compromised
* web server to other machines would depend heavily on the
* specific configuration of the network. Best practices recommend
* that the network architecture account for the inherent high-risk
* that machines in an uncontrolled environment, like the Internet,
* face by minimizing overall exposure though measures like DMZ's,
* operating with minimal services and isolating contact with
* internal networks. Steps like this can limit overall exposure
* and impede an attacker's ability to broaden the scope of a
* possible compromise.
- While the ISAPI filter is installed by default, it is not loaded
* on any web site by default. It must be enabled through the
* Commerce Server Administration Console in the Microsoft
* Management Console (MMC).
Risk Rating:
============
- Internet systems: Critical
- Intranet systems: Critical
- Client systems: None
Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read the
* Security Bulletin at
* http://www.microsoft.com/technet/security/bulletin/ms02-010.asp
* for information on obtaining this patch.
- ---------------------------------------------------------------------
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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*******************************************************************
You have received this e-mail bulletin as a result of your subscription to the Microsoft Product Security Notification * Service. *For more information on this service, please visit http://www.microsoft.com/technet/security/notify.asp.
To verify the digital signature on this bulletin, please download our PGP key at http://www.microsoft.com/technet/security/notify.asp.
To cancel your subscription, click on the following link mailto:1_26140_1E81A08D-A2CD-4E10-8D7F-16D1039270F8_US@Newsletters.Microsoft.com?subject=UNSUBSCRIBE to create an unsubscribe e-mail.
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For security-related information about Microsoft products, please *visit the Microsoft Security Advisor web site at http://www.microsoft.com/security.