Mbed TLS PRNG种子误用导致的高危漏洞CVE-2026-25835

/* * Conceptual PoC for CVE-2026-25835 (PRNG Seed Misuse) * This demonstrates how a weak or predictable seed compromises the RNG. */ #include <stdio.h> #include <stdlib.h> void simulate_vulnerable_rng(unsigned int seed) { printf("[+] Initializing PRNG with seed: %u\n", seed); srand(seed); // Generate a token that should be random int secure_token = rand(); printf("[+] Generated 'Secure' Token: %d\n", secure_token); } void attacker_predict(unsigned int guessed_seed) { printf("[!] Attacker guessing seed: %u\n", guessed_seed); srand(guessed_seed); int predicted_token = rand(); printf("[!] Attacker predicted Token: %d\n", predicted_token); } int main() { // Scenario: The application uses a predictable seed (e.g., timestamp or PID) unsigned int predictable_seed = 16250; // Example weak seed // Victim execution simulate_vulnerable_rng(predictable_seed); // Attacker execution (knowing the seed logic) attacker_predict(predictable_seed); return 0; }