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umpnpmgr.dll - What is umpnpmgr.dll?


umpnpmgr.dll File Description:

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.

Author: Microsoft Corporation
Author URL: http://www.microsoft.com
Part of: Universal Plug-and-Play Manager
Memory Usage: Low
Associated Applications: PNP_GetDeviceList, PNP_GetDeviceListSize
Background DLL: No
Uses Network: No
Hardware Related: No
Common Path: C:/ Windows/ system32/ umpnpmgr.dll
DLL Version: 5.1.2600.1106

Recommendation:

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Do you have errors with umpnpmgr.dll?

The Reason for umpnpmgr.dll Errors:

Upon receiving errors with umpnpmgr.dll you are potential receiving a serious Windows file system error - this error might be the outcome of damage to your program registry and action is required to fix it right away to prevent further damage to your operating system. Experiencing these errors places your system in danger for fatal crashes, blue screen errors and even system device failure.

umpnpmgr.dll Errors - Common Symptoms:

umpnpmgr.dll errors produce a range of symptoms, including but not limited to: personal computer locks on start up or shut down, softwares halt, diminished computer speed, built-in speaker beeping, trouble opening documents, sluggish behaviour and software installation problems.

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