NTSYSCALLAPI NTSTATUS NTAPI NtQueryWnfStateData( _In_ PCWNF_STATE_NAME StateName, // 64-bit WNF State Name _In_opt_ PCWNF_TYPE_ID TypeId, // Optional Type GUID VOID *ExplicitScope, // Optional Scope _Out_ PWNF_CHANGE_STAMP ChangeStamp, // Current version/stamp of the data _Out_ PVOID Buffer, // Output buffer for data _Inout_ PULONG BufferSize // Buffer size (in/out) Use code with caution. Copied to clipboard GitHub - sbousseaden/injection-1 Key Use Cases System Monitoring
#include <Windows.h> #include <ntstatus.h>
"Użytkownik zgłasza problem z komunikatem o braku punktu wejścia procedury NtQueryWnfStateData w bibliotece ntdll.dll podczas uruchamiania programów" – Polish Windows forum, 2020
WNF structures have been directly implicated in several high-profile kernel vulnerabilities. Notably, the local privilege escalation , a bug in the NTFS driver, was exploited in the wild using the WNF subsystem. Researchers demonstrated how to leverage WNF state data objects to build powerful exploit primitives, including arbitrary kernel read/write. More recent vulnerabilities, such as CVE-2025-21333 , a heap-based buffer overflow, also utilize WNF state data as part of their exploit chain. ntquerywnfstatedata ntdlldll better
If you are currently evaluating this architecture for your application, what specific system event or state change are you trying to track? If you share details on your target use case, I can provide the precise, reverse-engineered or help write a subscription loop using NtSubscribeWnfStateCell .
NTSTATUS NtQueryWnfStateData( _In_ PWNF_STATE_NAME StateName, _In_opt_ PWNF_TYPE_ID TypeId, _In_opt_ const VOID* ExplicitScope, _Out_ PWNF_CHANGE_STAMP ChangeStamp, _Out_writes_bytes_to_opt_(*BufferSize, *BufferSize) PVOID Buffer, _Inout_ PULONG BufferSize ); Use code with caution. Copied to clipboard How to Use it "Better"
As the API is not documented in standard SDKs, you must reverse-engineer its prototype to use it. By examining public headers and security research, its signature has been clearly established. The most accurate definition, found in sources like the wininc/ntexapi.h header used by the DynamoRIO project, is as follows: Researchers demonstrated how to leverage WNF state data
user wants a long article on "ntquerywnfstatedata ntdlldll better". This looks like a Windows system programming topic. I need to search for relevant information. I'll search for "NtQueryWnfStateData" and related topics. search results show various sources. I'll open some to gather more detailed information.'ll continue searching for more information on NtQueryWnfStateData, WNF, and ntdll.dll. have gathered information from various sources. I will now structure the article. have enough information to write a comprehensive article. The article will cover the NtQueryWnfStateData function, its relation to ntdll.dll, the Windows Notification Facility (WNF), common errors like missing entry point, how to use it with Focus Assist, and its role in security research. A Deep Dive into NtQueryWnfStateData, ntdll.dll, and Mastering the Windows Notification Facility (WNF)
Understanding how NtQueryWnfStateData interacts with reveals why bypass mechanisms using native APIs offer superior throughput and performance over traditional synchronization objects. The Role of ntdll.dll and the Native API
: Always initialize the BufferSize pointer correctly. If the provided buffer is too small, the function will return STATUS_BUFFER_TOO_SMALL , but an uninitialized pointer will cause an immediate crash. If you share details on your target use
The entire transition is designed to be as lightweight as possible, because many Windows components call these functions thousands of times during normal system operation. Microsoft uses these mechanisms internally for performance-sensitive operations; third-party use is discouraged precisely because the undocumented nature means that behavior can change without warning.
The Windows Notification Facility (WNF) was introduced in Windows 8 and significantly expanded in Windows 10 and 11. It acts as a system-wide, highly structured billboard. Components inside the kernel or user-mode applications can publish state information to a specific "State Name" (a 64-bit identifier), and other components can query or subscribe to updates.