CVE-2026-34871 Mbed TLS PRNG种子可预测漏洞

/* * PoC Concept for CVE-2026-34871: Predictable Seed in PRNG * This C code demonstrates the consequence of a predictable seed (e.g., time) in a PRNG. * If Mbed TLS uses a predictable seed, the output sequence becomes reproducible. */ #include <stdio.h> #include <stdlib.h> #include <time.h> void simulate_vulnerable_prng() { // Scenario: Using system time as a seed (Predictable) unsigned int predictable_seed = (unsigned int)time(NULL); printf("[+] Using predictable seed: %u\n", predictable_seed); srand(predictable_seed); printf("[+] Generated Random Numbers: "); for (int i = 0; i < 5; i++) { printf("%d ", rand()); } printf("\n"); printf("[!] An attacker knowing the time of generation can reproduce this sequence.\n"); } int main() { simulate_vulnerable_prng(); return 0; }