BUGKU——秋名山/never give up

**

秋名山老司机

**

先上链接：http://123.206.87.240:8002/qiumingshan/
打开之后是这样一串数字，使用burpsuite抓包但是没用，
只能通过写一个脚本通过post请求``

import re
import requests
url='http://123.206.87.240:8002/qiumingshan/'
s = requests.Session()
source = s.get(url)
expression = re.search(r'(\d+[+\-*])+(\d+)', source.text).group()
result = eval(expression)
post = {'value': result}
print(s.post(url, data = post).text)

前面的两个import分别是导入函数模块和请求模块。
将url的内容导入里面
s = requests.Session()
requests库的session对象能够帮我们跨请求保持某些参数，也会在同一个session实例发出的所有请求之间保持cookies。
如果想进一步了解Python中的requests.Session()可以参考以下链接
Python
接下来通过get请求到网页的源代码。
然后利用正则表达式截取响应内容中的算术表达式。引入 re 模块，其次用 search() 匹配算术表达式，匹配成功后用 group() 返回算术表达式的字符串。
search中的正则表达式r表示不转义，\d表示匹配数字。[+-*]表示是符号中的其中一个，\d+表示匹配数字不止一次。

获得算术表达式的字符串后，直接利用 Python 的內建方法 eval() 来计算出结果，简单、暴力、快捷

执行出来flag==Bugku{YOU_DID_IT_BY_SECOND}

**

never give up

**
先上链接http://123.206.87.240:8006/test/hello.php

进入页面就一句英文没东西，
习惯性Ctrl+U查看源代码

发现了一个1p.html进入网站发现了一段URL编码
编码如下，
%3Cscript%3Ewindow.location.href%3D%27http%3A//www.bugku.com%27%3B%3C/script%3E%20%0A%3C%21--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%3D%3D--%3E

通过URL解码得到一段base64编码

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

base64解码后，又得到了一段URL编码，

%22%3Bif%28%21%24_GET%5B%27id%27%5D%29%0A%7B%0A%09header%28%27Location%3A%20hello.php%3Fid%3D1%27%29%3B%0A%09exit%28%29%3B%0A%7D%0A%24id%3D%24_GET%5B%27id%27%5D%3B%0A%24a%3D%24_GET%5B%27a%27%5D%3B%0A%24b%3D%24_GET%5B%27b%27%5D%3B%0Aif%28stripos%28%24a%2C%27.%27%29%29%0A%7B%0A%09echo%20%27no%20no%20no%20no%20no%20no%20no%27%3B%0A%09return%20%3B%0A%7D%0A%24data%20%3D%20@file_get_contents%28%24a%2C%27r%27%29%3B%0Aif%28%24data%3D%3D%22bugku%20is%20a%20nice%20plateform%21%22%20and%20%24id%3D%3D0%20and%20strlen%28%24b%29%3E5%20and%20eregi%28%22111%22.substr%28%24b%2C0%2C1%29%2C%221114%22%29%20and%20substr%28%24b%2C0%2C1%29%21%3D4%29%0A%7B%0A%09require%28%22f4l2a3g.txt%22%29%3B%0A%7D%0Aelse%0A%7B%0A%09print%20%22never%20never%20never%20give%20up%20%21%21%21%22%3B%0A%7D%0A%0A%0A%3F%3E

继续解码

得到一段代码

```python
<script>window.location.href='http://www.bugku.com';</script> 
<!--";if(!$_GET['id'])
{
	header('Location: hello.php?id=1');
	exit();
}
$id=$_GET['id'];
$a=$_GET['a'];
$b=$_GET['b'];
if(stripos($a,'.'))
{
	echo 'no no no no no no no';
	return ;
}
$data = @file_get_contents($a,'r');
if($data=="bugku is a nice plateform!" and $id==0 and strlen($b)>5 and eregi("111".substr($b,0,1),"1114") and substr($b,0,1)!=4)
{
	require("f4l2a3g.txt");
}
else
{
	print "never never never give up !!!";
}


?>-->

可以看到里面有一些敏感的东西f4l2a3g.txt，放到链接上跑一遍
flag就出来了、——flag{tHis_iS_THe_fLaG}