The following code is for security research and authorized testing only.
python
# CVE-2025-55340 - Windows RDP Authentication Bypass PoC (Conceptual)
# This is a conceptual demonstration based on public vulnerability information.
# Actual exploitation requires specific environment configuration.
import subprocess
import sys
import os
# Note: This PoC demonstrates the concept of the vulnerability.
# Real exploitation requires local access and specific RDP configurations.
def check_rdp_service():
"""Check if RDP service is running on the local system"""
try:
result = subprocess.run(
["sc", "query", "TermService"],
capture_output=True, text=True
)
if "RUNNING" in result.stdout:
print("[+] RDP Service (TermService) is running")
return True
else:
print("[-] RDP Service is not running")
return False
except Exception as e:
print(f"[-] Error checking RDP service: {e}")
return False
def enumerate_rdp_sessions():
"""Enumerate active RDP sessions (low-privilege context)"""
try:
result = subprocess.run(
["query", "session"],
capture_output=True, text=True
)
print("[+] Active RDP Sessions:")
print(result.stdout)
return result.stdout
except Exception as e:
print(f"[-] Error enumerating sessions: {e}")
return None
def check_user_privileges():
"""Check current user privilege level"""
try:
result = subprocess.run(
["whoami", "/priv"],
capture_output=True, text=True
)
print("[+] Current User Privileges:")
print(result.stdout)
# Check for SeAssignPrimaryTokenPrivilege or similar
if "SeRemoteInteractiveLogonRight" in result.stdout:
print("[!] User has RDP-related privileges")
return result.stdout
except Exception as e:
print(f"[-] Error checking privileges: {e}")
return None
def exploit_auth_bypass(target_session_id):
"""
Conceptual exploitation of RDP authentication bypass.
The vulnerability allows a low-privilege user to bypass
authentication checks in the RDP subsystem.
"""
print(f"[*] Attempting to exploit CVE-2025-55340 on session {target_session_id}")
# In the actual vulnerability, the authentication bypass occurs
# due to improper validation in the RDP authentication subsystem.
# A low-privilege attacker can leverage this to gain unauthorized
# access to RDP-protected resources.
print("[!] This is a conceptual PoC - actual exploitation requires")
print(" specific system configuration and the Microsoft patch")
print(" for CVE-2025-55340 must NOT be applied.")
if __name__ == "__main__":
print("=" * 60)
print("CVE-2025-55340 - Windows RDP Authentication Bypass")
print("CVSS 3.1: 7.0 (HIGH)")
print("Vector: AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H")
print("=" * 60)
if not check_rdp_service():
sys.exit(1)
enumerate_rdp_sessions()
check_user_privileges()
print("\n[*] Recommendation: Apply Microsoft security update")
print(" https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55340")