CVE-2026-28389 OpenSSL空指针解引用DoS漏洞

# PoC Concept: Crafted CMS EnvelopedData with missing parameters import sys from pyasn1.type import univ, namedtype from pyasn1.codec.der import encoder # Simplified ASN.1 structure representation for KeyAgreeRecipientInfo # missing the 'parameters' field in KeyEncryptionAlgorithmIdentifier class MalformedKeyAgreeRecipientInfo(univ.Sequence): componentType = namedtype.NamedTypes( namedtype.NamedType('version', univ.Integer()), # ... other fields ... # KeyEncryptionAlgorithmIdentifier without 'parameters' would go here ) # Note: This is a conceptual representation. Actual exploitation requires # constructing a full valid DER-encoded CMS blob where the specific # optional parameter is omitted to trigger the NULL deref in OpenSSL. def generate_malformed_cms(): # In a real exploit, this blob would be the crafted CMS data return b"MALFORMED_CMS_DATA" if __name__ == "__main__": print("Generating malformed CMS data for CVE-2026-28389...") data = generate_malformed_cms() print(f"Payload length: {len(data)}") # Send this data to a target application using CMS_decrypt()