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Category:   Application (Generic)  >   Windows UPnP (Ssdpsrv, others) Vendors:   Microsoft
(Microsoft Issues Corrected Update for Windows ME) Microsoft Windows Me Universal Plug and Play (UPnP) Ssdpsrv.exe Server Component Can Be Crashed by Remote Users
SecurityTracker Alert ID:  1002746
SecurityTracker URL:  http://securitytracker.com/id/1002746
CVE Reference:   CVE-2001-0721   (Links to External Site)
Date:  Nov 14 2001
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Ssdpsrv, a component of the Microsoft Windows Me Universal Plug and Play (UPnP) implementation. A remote user may be able to cause the Ssdpsrv service to crash.

It is reported that a remote user can connect to the Ssdpsrv port and cause the service to crash. The service must be manually restarted or the server must be rebooted in order for the service to return to normal operation.

The following steps can reportedly be used to cause the service to crash:

Connect to the computer on port 5000.
Send 3 to 5 newline characters.
You then get an error and are disconnected.

A demonstration exploit transcript is provided:

<snip>
bash-2.05$ telnet 165.121.234.217 5000
Trying 165.121.234.217...
Connected to 165.121.234.217.
Escape character is '^]'.



HTTP/1.1 400 Bad Request

Connection closed by foreign host.
bash-2.05$
</snap>

The error caused by the crash is provided:

Ssdpsrv has caused an error in MSVCRT.DLL.
Ssdpsrv will now close.
If you continue to experience problems,
try restarting your computer.

Several users have reported that they are unable to reproduce the error.

Impact:   A remote user can cause the Ssdpsrv.exe service to crash.
Solution:   The vendor has released a corrected version of the Windows ME patch. Microsoft recommends that customers who installed the original Windows ME patch download and install the new one:

Microsoft ME:
http://download.microsoft.com/download/winme/Update/21388/WinMe/EN-US/311311USAM.EXE

For patch information for other platforms, see the Vendor URL or follow the Message History.

Vendor URL:  www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS01-054.asp (Links to External Site)
Cause:   Exception handling error
Underlying OS:  Windows (Me)
Underlying OS Comments:  Windows 98 and 98SE are only affected if the Internet Connection Sharing that ships with Windows XP has been installed on the host

Message History:   This archive entry is a follow-up to the message listed below.
Oct 20 2001 Microsoft Windows Me Universal Plug and Play (UPnP) Ssdpsrv.exe Server Component Can Be Crashed by Remote Users



 Source Message Contents

Subject:  Microsoft Security Bulletin MS01-054 (Version 2.0)


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:      Invalid Universal Plug and Play Request can Disrupt
            System Operation
Released:   01 November 2001
Revised:    13 November 2001
Software:   Windows 98, Windows ME, Windows XP
Impact:     Denial of Service
Max Risk:   low
Bulletin:   MS01-054

Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS01-0xx.asp.
- ----------------------------------------------------------------------

Reason for Revision:
====================
On November 08, 2001 Microsoft discovered that the Windows ME
patch failed to properly register the upnp.dll. On November 13,
2001, Microsoft released a corrected version of the Windows ME patch.
Microsoft recommends that customers who installed the original
Windows ME patch download and install the new one. Customers using
other systems do not need to take any additional action, as only
the Windows ME patch contained the error.

Issue:
======
The Universal Plug and Play (UPnP) service allows computers to
discover and use network-based devices. Windows ME and XP include
native UPnP services; Windows 98 and 98SE do not include a native
UPnP service, but one can be installed via the Internet Connection
Sharing client that ships with Windows XP. 

A vulnerability results because the UPnP service does not correctly
handle certain types of invalid UPnP requests. On Windows 98, 98SE,
and ME systems, receiving such a request could cause a variety of
effects ranging from slow performance to system failure. On
Windows XP, the effect is less serious as the flaw consists of a
memory leak. Each time a Windows XP system received such a request,
a small amount of system memory would become unavailable; 
if repeated many times, it could deplete system resources to
the point where performance slowed or stopped altogether. 

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

 - Standard firewalling practices (specifically, blocking ports 1900
   and 5000) could be used to protect corporate networks from
   Internet-based attacks.
 
 - On Windows 98 and 98SE, there is no native UPnP support for these
   systems. Windows 98 and 98SE systems would only be affected if
   the Internet Connection Sharing Client from Windows XP had been
   installed on the system. 

 - On Windows ME, UPnP supportis neither installed nor running by
   default. (However, some OEMs do configure pre-built systems
   with the service installed and running). 

 - On Windows XP, the Internet Connection Firewall, which runs
   by default, would impede an attacker's ability to locate and
   attack the system. 

Risk Rating:
============
 - Internet systems: Low
 - Intranet systems: Low
 - Client systems: Low

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletin at
   http://www.microsoft.com/technet/security/bulletin/ms01-054.asp
   for information on obtaining this patch.

Acknowledgment:
===============
 - 'Ken' from FTU (franklin_tech_unlimited@yahoo.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
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OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO
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   *******************************************************************
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