CVE-2025-43521 Apple macOS降级漏洞导致敏感数据访问

// CVE-2025-43521 PoC - macOS Code Signing Downgrade Attack Simulation // This PoC demonstrates the concept of exploiting the downgrade vulnerability // Note: This is for educational and research purposes only #include <stdio.h> #include <stdlib.h> #include <string.h> // Simulated vulnerable code signing check int vulnerable_code_signing_check(const char* app_bundle_path) { // VULNERABLE: Only checks if app is signed, not signature freshness // In real attack, attacker provides old signed version of app FILE* f = fopen(app_bundle_path, "rb"); if (f) { // Check basic signature presence char header[4]; fread(header, 1, 4, f); fclose(f); // VULNERABLE: No version/timestamp validation if (strncmp(header, "\xfa\xde\x71\xfb", 4) == 0) { return 1; // Signed, but OLD version accepted } } return 0; } // Secure code signing check (patched version) int secure_code_signing_check(const char* app_bundle_path) { FILE* f = fopen(app_bundle_path, "rb"); if (f) { char header[4]; fread(header, 1, 4, f); fclose(f); if (strncmp(header, "\xfa\xde\x71\xfb", 4) == 0) { // ADDED: Check signature timestamp and minimum version time_t sig_time = get_signature_timestamp(app_bundle_path); time_t min_allowed = get_minimum_allowed_timestamp(); if (sig_time >= min_allowed) { return 1; // Signed and fresh enough } } } return 0; } int main(int argc, char* argv[]) { if (argc < 2) { printf("Usage: %s <app_bundle_path>\n", argv[0]); return 1; } printf("Testing vulnerable check...\n"); if (vulnerable_code_signing_check(argv[1])) { printf("[VULNERABLE] Old signed app accepted!\n"); } printf("Testing secure check...\n"); if (secure_code_signing_check(argv[1])) { printf("[SECURE] App accepted with valid signature\n"); } else { printf("[SECURE] Old signature rejected!\n"); } return 0; }