CVE-2026-3849 wolfSSL栈缓冲区溢出漏洞

/* * PoC Concept for CVE-2026-3849 * This snippet demonstrates the vulnerable condition. * Triggering this requires a wolfSSL client compiled with --enable-ech * connecting to a server that sends a maliciously large ECH config. */ #include <stdio.h> #include <string.h> #include <wolfssl/ssl.h> void simulate_malicious_ech_config() { // This represents the oversized ECH config sent by a malicious server unsigned char oversized_ech_config[2048]; memset(oversized_ech_config, 0x41, sizeof(oversized_ech_config)); // In a real exploitation scenario, this data is sent during the TLS handshake // The client receives it and passes it to the vulnerable function printf("Simulating reception of oversized ECH config (%zu bytes)\n", sizeof(oversized_ech_config)); // The vulnerability occurs in wc_HpkeLabeledExtract when processing this buffer // without proper bounds checking, leading to a stack-based buffer overflow. // Vulnerable call context: // wc_HpkeLabeledExtract(..., oversized_ech_config, sizeof(oversized_ech_config)); } int main() { printf("CVE-2026-3849 PoC Simulation\n"); simulate_malicious_ech_config(); return 0; }