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TUCoPS :: Windows Apps :: n-109.txt
Microsoft Flaw in ISAPI Extension for Windows Media Services Could Cause Code Execution (CIAC N-109)

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The U.S. Department of Energy
Computer Incident Advisory Capability
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INFORMATION BULLETIN

Microsoft Flaw in ISAPI Extension for Windows Media Services Could Cause
Code Execution
[Microsoft Security Bulletin MS03-022]

June 25, 2003 20:00 GMT Number N-109
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PROBLEM: There is a flaw in the way nsiislog.dll processes incoming
client requests.
SOFTWARE: Microsoft Windows 2000
DAMAGE: An attacker could send specially formed HTTP request to the
server that could cause IIS to fail or execute code on the
user's system.
SOLUTION: Apply patch as stated in Microsoft's security bulletin.
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VULNERABILITY The risk is MEDIUM. An attacker attempting to exploit this
ASSESSMENT: vulnerability would have to be aware which computers on the
network had Windows Media Services installed on it and send a
specific request to that server.
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LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-109.shtml
ORIGINAL BULLETIN:
http://www.microsoft.com/technet/treeview/
default.asp?url=/technet/security/bulletin/MS03-022.asp
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[***** Start Microsoft Security Bulletin MS03-022 *****]

Microsoft Security Bulletin MS03-022

Flaw in ISAPI Extension for Windows Media Services Could Cause Code Execution
(822343)
Originally posted: June 25, 2003

Summary

Who should read this bulletin: System administrators running Microsoft®
Windows® 2000

Impact of vulnerability: Allow an attacker to execute code of their choice

Maximum Severity Rating: Important

Recommendation: System administrators should install the patch at the earliest
available opportunity.

End User Bulletin: An end user version of this bulletin is available at:

http://www.microsoft.com/security/security_bulletins/ms03-022.asp.

Affected Software:

* Microsoft Windows 2000

Not Affected Software Versions:

* Windows NT 4.0
* Microsoft Windows XP
* Microsoft Windows Server 2003

Technical details

Technical description:

Microsoft Windows Media Services is a feature of Microsoft Windows 2000 Server,
Advanced Server, and Datacenter Server and is also available in a downloadable
version for Windows NT 4.0 Server. Windows Media Services contains support for
a method of delivering media content to clients across a network known as
multicast streaming. In multicast streaming, the server has no connection to or
knowledge of the clients that may be receiving the stream of media content
coming from the server. To facilitate logging of client information for the
server, Windows 2000 includes a capability specifically designed to enable
logging for multicast transmissions.

This logging capability is implemented as an Internet Services Application
Programming Interface (ISAPI) extension – nsiislog.dll. When Windows Media
Services are added through add/remove programs to Windows 2000, nsiislog.dll
is installed in the Internet Information Services (IIS) Scripts directory on
the server. Once Windows Media Services is installed, nsiislog.dll is
automatically loaded and used by IIS.

There is a flaw in the way nsiislog.dll processes incoming client requests.
A vulnerability exists because an attacker could send specially formed HTTP
request (communications) to the server that could cause IIS to fail or execute
code on the user's system.

Windows Media Services is not installed by default on Windows 2000. An attacker
attempting to exploit this vulnerability would have to be aware which computers
on the network had Windows Media Services installed on it and send a specific
request to that server.

Mitigating factors:

* Windows Media Services 4.1 is not installed by default on Windows 2000.
* Windows Media Services are not available for Windows 2000 Professional.

Severity Rating: Windows 2000 Important
The above assessment is based on the types of systems affected by the vulnerability,
their typical deployment patterns, and the effect that exploiting the vulnerability
would have on them.

Vulnerability identifier: CAN-2003-0349

Tested Versions:
Microsoft tested Windows NT 4.0, Windows 2000, Windows XP and Windows Server 2003 to
assess whether they are affected by these vulnerabilities. Previous versions are no
longer supported, and may or may not be affected by these vulnerabilities.

Patch availability

Download locations for this patch

* Microsoft Windows 2000:
http://microsoft.com/downloads/
details.aspx?FamilyId=F772E131-BBC9-4B34-9E78-F71D9742FED8&displaylang=en

Additional information about this patch

Installation platforms:
This patch can be installed on systems running Microsoft Windows 2000 Service Pack 2,
Windows 2000 Service Pack 3 and Microsoft Windows 2000 Service Pack 4.

Inclusion in future service packs:
The fix for this issue will be included in Windows 2000 Service Pack 5.

Reboot needed: No.

Patch can be uninstalled: No.

Superseded patches: This patch supercedes the patch provided with MS03-019.

Verifying patch installation:

* To verify that the patch has been installed on the machine, confirm that the following
registry key has been created on the machine:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows Media Services\wm822343

* To verify the individual files, use the date/time and version information provided in
Knowledge Base article 822343.

Caveats:
None

Localization:
Localized versions of this patch are available at the locations discussed in “Patch
Availability”.

Obtaining other security patches:
Patches for other security issues are available from the following locations:

* Security patches are available from the Microsoft Download Center, and can be most
easily found by doing a keyword search for "security_patch".
* Patches for consumer platforms are available from the WindowsUpdate web site

Other information:

Acknowledgments
Microsoft thanks Brett Moore for reporting this issue to us and working with us to protect
customers.

Support:

* Microsoft Knowledge Base article 822343 discusses this issue and will be available
approximately 24 hours after the release of this bulletin. Knowledge Base articles can be
found on the Microsoft Online Support web site.
* Technical support is available from Microsoft Product Support Services. There is no charge
for support calls associated with security patches.

Security Resources: The Microsoft TechNet Security Web Site provides additional information
about security in Microsoft products.

Disclaimer:
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.

Revisions:

* V1.0 (June 25, 2003): Bulletin Created.

[***** End Microsoft Security Bulletin MS03-022 *****]

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CIAC wishes to acknowledge the contributions of Microsoft Corporation for the
information contained in this bulletin.
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CIAC, the Computer Incident Advisory Capability, 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
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This document was prepared as an account of work sponsored by an
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Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
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