CTF [网络安全实验室] [基础关]

基础关

1.key在哪里？

F12查看源码

2.再加密一次你就得到key了

加密之后的数据为xrlvf23xfqwsxsqf

我们在进行一次加密即可。

ROT13在线解码工具

3.猜猜这是经过了多少次加密？

加密后的字符串：

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FVqQlphMXBQVlRKRmVsRnRPVmROVm5CVVZXcEtVbVZXVW5WVWJHaFlVakZLYjFaWGVHOVZNaz
VYWWtoT1YxWkZXbFJVVmxwSFRrWlplVTFVUW1oU2JIQXdWbGQwYzFkSFJuSk9WRTVYWVd0d1N
Ga3llRTlrUjBaSFkwZDRhRTFZUWpWV2JYQkRXVlpWZVZSdVRtcFNWMmhVV1d0Vk1XTkdXblJr
U0dSWFlrWnNORmRyVWtOWGJGbDRVbXBPVldKR2NISldNR1JMWXpGT2NrOVdaR2hOVm5CTlZqR
mFZVmxYVWtoV2ExcGhVbFJzVkZscmFFSmtNV1J6Vm0xR2FFMVdjRmxWTW5SaFlXeEtXR1ZIUm
xWV1JUVkVXbFphVjFJeFNsVmlSa1pXVmtSQk5RPT0=

base64密文，我们写python脚本进行解密。

# -*- codeing = utf-8 -*-
# @Time : 2021/5/4 9:47
# @Author : rexu
# @File : bs64.py
# @Software : PyCharm
import base64
f = open("1.txt","r")
a = f.read()
while 1:
    a = base64.b64decode(a)
    print(a)

得key

4.据说MD5加密很安全，真的是吗？

e0960851294d7b2253978ba858e24633

在线MD5加解密工具：https://www.cmd5.com/

5.种族歧视：小明同学今天访问了一个网站，竟然不允许中国人访问！太坑了，于是小明同学决心一定要进去一探究竟！

火狐访问，burp抓包

试着加了一个referer：Foreigner 发现不行；发现存在language，删除掉CN相关语言，放包。

6.HAHA浏览器

想到修改User-Agent

7.key究竟在哪里呢？

抓包重放发现了key。

8.key又找不到了。

两个跳转，分别抓包。

访问key_is_here_now_.php得到key

9.冒充登录用户：小明来到一个网站，还是想要key，但是却怎么都登陆不了，你能帮他登陆吗？

抓包发现，Cookie:Login=0 修改为1即可。

10.比较数字大小。

题目是一个数字输入框，限制数字长短，打开burp改参数为一个足够大的值即可。

11.本地的诱惑：小明扫描了他心爱的小红的电脑，发现开放了一个80端口，但是当小明去访问的时候却发现只允许从本地访问，可他心爱的小红不敢让这个诡异的小明触碰她的电脑，可小明真的想知道小红电脑的80端口到底隐藏着什么秘密(key)？

题目意思需要访问80端口。

emmm

12.就不让你访问：小明设计了一个网站，因为总是遭受黑客攻击后台，所以这次他把后台放到了一个无论是什么人都找不到的地方。

我在抓包修改参数无果后，开始访问robots.txt，果然。

访问：http://lab1.xseclab.com/base12_44f0d8a96eed21afdc4823a0bf1a316b/9fb97531fe95594603aff7e794ab2f5f/

所以访问：http://lab1.xseclab.com/base12_44f0d8a96eed21afdc4823a0bf1a316b/9fb97531fe95594603aff7e794ab2f5f/login.php