umpnpmgr.dll Error Fix

What is a DLL?

DLL (Dynamic Link Library) files contain computer code and resources that can be used by multiple programs at the same time. This uses less system memory and helps your computer system run more efficiently. DLL files give program developers the ability to reuse code to add features to several programs without the need to write new code for each program.

There are many programs that require DLL files to function properly so when one of them is damaged or missing it will cause program crashes and poor system performance.

What is umpnpmgr.dll?

The process umpnpmgr.dll serves as an able host to the Plug-n-Play services of the Windows operating system. These services lay out an RPC interface needed to access the device manager and the notification functions. Plug and Play is a Windows NT 4.0 default service and a support for its being hard-coded into the Service Control Manager in the sevices.exe application.

Because of its utmost importance the service cannot just be stopped at any given time once started. Any attempt to disable it poses a greater risk of making the system unusable. Much in the same way that the absence of the umpnpmgr.dll file would greatly affect the system’s functions.

The code of the umpnpmgr.dll module dynamically linked a number of calls to wsprintfW to construct different formatted strings in stack buffers. This is applicable in instances where the user input is only validated by whether or not it matches a subkey of HKEY_LOCAL_MACHINE/ SYSTEM/ CurrentControlSet/ Enum.

Despite the fact that this registry branch is protected from unprivileged modifications an assumption that any valid key name is safe can always be circumvented by adding arbitrary lengths of progressive backslashes for example “HTREE/ROOT////0////////”. The functions PNP_GetDeviceList and PNP_GetDeviceListSize embedded in the umpnpmgr.dll module both exhibit this vulnerability.

As to the former any valid subkey name may be accepted just to reach a vulnerable wsprintfW call while the latter must receive a key name with an empty second or third component in order to reach a vulnerable wsprintfW call. This protective maneuver is due to the way SplitDeviceInstanceString patronizes the string.

This threat nonetheless is not related to the MS05-039 Plug and Play vulnerability and is not resolved by the MS05-039 hotfix. A generic security measure instituted in the patch will prevent its anonymous exploitation making the eminent threat an internal healing or mass compromise in a domain setting.

Microsoft fixed this vulnerability in Windows 2003 by replacing the unsafe wsprintfW calls with calls to vsnwprintf. On why this security fix was not shipped to any other Windows operating system is yet to be given an explanation.

Recommended fix if you are experiencing umpnpmgr.dll error messages:

DLL files are important parts of your operating system and many programs require them to function. When these files become damaged or are missing it causes poor system performance and system crashes. To fix these problems the user must replace the damaged file with a valid working version. If a working version cannot be found the user may perform a reinstallation of their operating system.

Umpnpmgr.dll is created by:

Microsoft Corporation

Known file path:



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