网络安全实验室2.基础关

Posted 2023-04-05 儒道易行

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2.基础关

1.key在哪里

url：http://lab1.xseclab.com/base1_4a4d993ed7bd7d467b27af52d2aaa800/index.php

查看网页源代码的方式有4种，分别是：1、鼠标右击会看到”查看源代码“，这个网页的源代码就出现在你眼前了；2、可以使用快捷Ctrl+U来查看源码；3、在地址栏前面加上view-source，如view-source：https://www.baidu.com ; 4、浏览器的设置菜单框中，找到“更多工具”，然后再找开发者工具，也可以查看网页源代码。

这道题明显考查查看源代码的方式，右键审查元素

key is jflsjklejflkdsjfklds

2.ROT13加密

url：http://hackinglab.cn/ShowQues.php?type=bases

根据题意，“再加密一次”判断是ROT-13

ROT13是它自己本身的逆反；也就是说，要还原ROT13，套用加密同样的算法即可得，故同样的操作可用再加密与解密

使用在线解密工具

http://www.rot13.de/

xrlvf23xfqwsxsqf 把数据复制过去，点击下方的按钮

key is 23ksdjfkfds

3.base64 加密

url：http://hackinglab.cn/ShowQues.php?type=bases

因为后面有“=”初次判断为base64

BASE64：是一种基于64个可打印字符来表示二进制数据的表示方法。Base64编码要求把3个8位字节（38=24）转化为4个6位的字节（46=24），之后在6位的前面补两个0，形成8位一个字节的形式，Base64的尾部填充用的是“=”号，只是用来补足位数的，以四个字符为一个块，最末尾不足四个字符的用“=”号填满。

base64，base32，base16的区别：

base64中包含大写字母（A-Z）、小写字母（a-z）、数字0——9以及+/；

base32中只有大写字母（A-Z）和数字234567

base16中包含了数字(0-9)和大写字母(A~F)

根据加密后的字符串所以只能是base64

第一种方法：使用base64在线解密工具

http://tool.oschina.net/encrypt?type=3

把加密后的字符串复制黏贴到右边，进行解密

点击 BASE64解码，发现没有出来没发现key.

再次解密！！！！复制左面的面的编码粘贴至右面再次解码！!!一直复制粘贴出来key为止

进行了20次的复制黏贴，终于得到了！

key is jkljdkl232jkljkdl2389

第二种方法：使用php脚本

<?php 
$data = "ba64加密的代码...";
$num = 0;
for ($i=0; $i < 1000; $i++)  
    $data2 = base64_decode($data);
    $data = base64_decode($data2);
    echo $data."<br/>";//不是$data就是$data2;两个随便输出一个就行了。

第三种方法：使用python脚本

第一个脚本：python3

#base64模块，专门用作base64编码解码的。
import base64
# 加密解密函数
def encrypt_decrypt(string):
    #首先，Base64生成的编码都是ascii字符。其次，python3中字符都为unicode编码，而b64encode函数的参数为byte类型，所以必须先转码。
    #将字符串转换成bytes 编码格式utf-8
    #编码可以将抽象字符以二进制数据的形式表示，有很多编码方法，如utf-8、gbk等，可以使用encode()函数对字符串进行编码，转换成二进制字节数据，也可用decode()函数将字节解码成字符串；用decode()函数解码，可不要用指定编码格式；
    #m查看循环次数
    m = 0
    #把string通过encode（）进行转换
    bytesString = string.encode(encoding='utf-8')
#使用了try···except···finally····捕获异常
    try:
        while True:
            m += 1
            decodeStr = base64.b64decode(bytesString)
            #赋值
            bytesString = decodeStr
    #发生异常则输出这个
    except Exception:
        #decode()方法以encoding指定的编码格式解码字符串，默认编码为字符串编码
        print('base64解码后的字符串：', decodeStr.decode())
    #无论try是否异常，finally总会执行
    finally:
        print(m)

#程序的入口main ，作用：防止在被其他文件导入时显示多余的程序主体部分。
if __name__ == '__main__':
    #测试数据
    encrypt_decrypt('字符串')

第二个脚本：python2

import base64
s = "加密后的字符串"
a = 0
try:
 while True:
  s = base64.decodestring(s)
  a += 1
except Exception:
 print s
 print a

4.MD5加密

url：http://hackinglab.cn/ShowQues.php?type=bases

使用md5在线解密

https://cmd5.org/

bighp

5.种族歧视

url：http://lab1.xseclab.com/base1_0ef337f3afbe42d5619d7a36c19c20ab/index.php

第一种方法：burp抓包

发现语言，因为这个网站只能让外国人进，所以把语言换成en-US

放包，得到key is: *(TU687jksf6&*

第二种方法：使用Python3脚本

import urllib,urllib.request
headers = 
        "Accept-Language": "en-US,en;q=0.9",
        'User-Agent': "HAHA"
    

def getpage(path):  # 抓取网页源代码
    # data = urllib.request.urlopen(path).read().decode("gbk", "ignore")  # 中文网页
    # return data
    request = urllib.request.Request(url=path, headers=headers)  # 冒充其他浏览器
    response = urllib.request.urlopen(request)  # 会话，打开网页
    data = response.read().decode("utf-8", "ignore")  # 读取网页并且编码
    return data

print(getpage('http://lab1.xseclab.com/base1_0ef337f3afbe42d5619d7a36c19c20ab/index.php'))# 网址自行更换

6.HAHA浏览器

url：http://lab1.xseclab.com/base6_6082c908819e105c378eb93b6631c4d3/index.php

第一种方法：burp抓包

发现有浏览器信息，那我们把浏览器改成HAHA

放包，得到key is: meiyouHAHAliulanqi

第二种方法：使用Python3脚本

import urllib,urllib.request
headers = 
        "Accept-Language": "en-US,en;q=0.9",
        'User-Agent': "HAHA"
    

def getpage(path):  # 抓取网页源代码
    # data = urllib.request.urlopen(path).read().decode("gbk", "ignore")  # 中文网页
    # return data
    request = urllib.request.Request(url=path, headers=headers)  # 冒充其他浏览器
    response = urllib.request.urlopen(request)  # 会话，打开网页
    data = response.read().decode("utf-8", "ignore")  # 读取网页并且编码
    return data

print(getpage('http://lab1.xseclab.com/base6_6082c908819e105c378eb93b6631c4d3/index.php'))# 网址自行更换

7.key究竟在哪里呢？

第一种方法：右键审查元素，得到Key: kjh%#$#%FDjjj

第二种方法：burp抓包，发送到重放模块，点击go，得到Key: kjh%#$#%FDjjj

8.key又找不到了

url：http://lab1.xseclab.com/base8_0abd63aa54bef0464289d6a42465f354/index.php

点击到这里找key，抓包重放，得到./key_is_here_now_.php

访问http://lab1.xseclab.com/base8_0abd63aa54bef0464289d6a42465f354/key_is_here_now_.php

得到key: ohHTTP302dd

9.冒充登陆用户

url：http://lab1.xseclab.com/base9_ab629d778e3a29540dfd60f2e548a5eb/index.php

第一种方法：burp抓包，cookie里的login参数改为1

得到key is: yescookieedit7823789KJ

第二种方法：使用python3脚本

import urllib,urllib.request
headers = 
        "Accept-Language": "en-US,en;q=0.9",
        'Cookie': "Login=1"
    

def getpage(path):  # 抓取网页源代码
    # data = urllib.request.urlopen(path).read().decode("gbk", "ignore")  # 中文网页
    # return data
    request = urllib.request.Request(url=path, headers=headers)  # 冒充其他浏览器
    response = urllib.request.urlopen(request)  # 会话，打开网页
    data = response.read().decode("utf-8", "ignore")  # 读取网页并且编码
    return data

print(getpage('http://lab1.xseclab.com/base9_ab629d778e3a29540dfd60f2e548a5eb/index.php'))# 网址自行更换

10.比较数字大小

url：http://lab1.xseclab.com/base10_0b4e4866096913ac9c3a2272dde27215/index.php

第一种方法，右键审查元素，前端验证，发现在框里最大长度是3，如图修改

输入9999，得到key is 768HKyu678567&*&K

第二种方法，burp抓包，直接输9999即可

11.本地的诱惑

url：http://lab1.xseclab.com/base11_0f8e35973f552d69a02047694c27a8c9/index.php

第一种方法：审查元素，得到key is ^&*(UIHKJjkadshf

第二种方法，必须本地访问，burp抓包，在 Request 中加入请求头 X-Forwarded-For: 127.0.0.1 ，得到key is ^&*(UIHKJjkadshf

注：X-Forwarded-For:简称XFF头，它代表客户端，也就是HTTP的请求端真实的IP，只有在通过了HTTP 代理或者负载均衡服务器时才会添加该项。它不是RFC中定义的标准请求头信息，在squid缓存代理服务器开发文档中可以找到该项的详细介绍。标准格式如下：X-Forwarded-For: client1, proxy1, proxy2。

12.就不让你访问

url：http://lab1.xseclab.com/base12_44f0d8a96eed21afdc4823a0bf1a316b/index.php

查看robots.txt,http://lab1.xseclab.com/base12_44f0d8a96eed21afdc4823a0bf1a316b/robots.txt

注：disallow 一般是用在robots.txt中的。表示禁止搜索引擎抓取。

Disallow，正是robots.txt文件中设置禁止搜索引擎收录哪些目录的一个词语。

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

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

得到right! key is UIJ%%IOOqweqwsdf

文笔生疏，措辞浅薄，望各位大佬不吝赐教，万分感谢。

免责声明：由于传播或利用此文所提供的信息、技术或方法而造成的任何直接或间接的后果及损失，均由使用者本人负责，文章作者不为此承担任何责任。

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https://xz.aliyun.com/u/37846

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https://blog.csdn.net/weixin_48899364?type=blog

公众号：
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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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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)