(Microsoft Issues Fix) Microsoft Windows Me Universal Plug and Play (UPnP) Ssdpsrv.exe Server Component Can Be Crashed by Remote Users
SecurityTracker Alert ID: 1002685|
SecurityTracker URL: http://securitytracker.com/id/1002685
(Links to External Site)
Date: Nov 2 2001
Denial of service via network|
Fix Available: Yes Vendor Confirmed: Yes |
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:
bash-2.05$ telnet 18.104.22.168 5000
Connected to 22.214.171.124.
Escape character is '^]'.
HTTP/1.1 400 Bad Request
Connection closed by foreign host.
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.
A remote user can cause the Ssdpsrv.exe service to crash.|
The vendor has released a patch:|
Microsoft 98 and 98SE:
This issue is eliminated via the update titled "Windows XP Update Package, October 25, 2001", available at:
Microsoft reports that the patch for Windows 98 and 98SE can be installed on any Windows 98 or 98SE system on which the Windows XP Internet Connection Sharing client has been installed. The patch for Windows ME can reportedly be installed on systems running Windows ME Gold. The patch for Windows XP can reportedly be installed on systems running Windows XP Gold.
The vendor reports on planning to include this fix in Windows XP Service Pack 1.
See the Source Message for the vendor's advisory containing directions on how to verify the appropriate fix.
Vendor URL: www.microsoft.com/technet/security/bulletin/MS01-054.asp (Links to External Site)
Exception handling error|
|Underlying OS: Windows (Me), Windows (98), Windows (XP)|
|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|
This archive entry is a follow-up to the message listed below.|
Source Message Contents
Subject: Microsoft Security Bulletin MS01-054|
The following is a Security Bulletin from the Microsoft Product Security
Please do not reply to this message, as it was sent from an unattended
-----BEGIN PGP SIGNED MESSAGE-----
Title: Invalid Universal Plug and Play Request can Disrupt
Date: 01 November 2001
Software: Windows 98, Windows ME, Windows XP
Impact: Denial of Service
Microsoft encourages customers to review the Security Bulletin at:
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.
- Standard firewalling practices (specifically, blocking ports 1900
and 5000) could be used to protect corporate networks from
- 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.
- A patch is available to fix this vulnerability. Please read the
Security Bulletin at
for information on obtaining this patch.
- 'Ken' from FTU (email@example.com)
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