西普实验吧-ctf-web-2

上传绕过

很不错的一种题型，就是文件上传有很多漏洞设法，这里是路径问题，测试发现，不检查类型参数，不检查内容，只检查后缀:

所以文件名怎么都得是“.jpg .gif .png”结尾，但是路径/upload可以做文章，用截取包工具，把/upload改成“/upload/xxx.php ”,然后在hex里面，把末尾修改成00:

你能跨过去吗

伪XSS题，就是把那个提示的链接：

http://www.test.com/NodeMore.jsp?id=672613&page=2&pageCounter=32&undefined&callback=%2b/v%2b%20%2bADwAcwBjAHIAaQBwAHQAPgBhAGwAZQByAHQAKAAiAGsAZQB5ADoALwAlAG4AcwBmAG8AYwB1AHMAWABTAFMAdABlAHMAdAAlAC8AIgApADwALwBzAGMAcgBpAHAAdAA%2bAC0-&_=1302746925413

里面弄出来，根据编码经验，URL解密：

http://www.test.com/NodeMore.jsp?id=672613&page=2&pageCounter=32&undefined&callback=+/v+ +ADwAcwBjAHIAaQBwAHQAPgBhAGwAZQByAHQAKAAiAGsAZQB5ADoALwAlAG4AcwBmAG8AYwB1AHMAWABTAFMAdABlAHMAdAAlAC8AIgApADwALwBzAGMAcgBpAHAAdAA+AC0-&_=1302746925413

+/v+ 是UTF-7编码，取

“ADwAcwBjAHIAaQBwAHQAPgBhAGwAZQByAHQAKAAiAGsAZQB5ADoALwAlAG4AcwBmAG8AYwB1AHMAWABTAFMAdABlAHMAdAAlAC8AIgApADwALwBzAGMAcgBpAHAAdAA+”

做base64解密：

跪倒在burpsuite下。。

PHP大法

还是编码的问题，先根据提示查临时文件

<?php
if(eregi("hackerDJ",$_GET[id])) {
  echo("<p>not allowed!</p>");
  exit();
}

$_GET[id] = urldecode($_GET[id]);
if($_GET[id] == "hackerDJ")
{
  echo "<p>Access granted!</p>";
  echo "<p>flag: *****************} </p>";
}
?>


<br><br>
Can you authenticate to this website?

也就是一开始要相等，后来要不等，，二次编码，你懂得，其实刚去服务器会自动解码一次的。

id=%2568%2561%2563%256b%2565%2572%2544%254a

OK

NSCTF web200

就是再跑一遍就好的意思。。

给了加密过程和密文，自己编写解密就好：

php版本

<?php
	$s="a1zLbgQsCESEIqRLwuQAyMwLyq2L5VwBxqGA3RQAyumZ0tmMvSGM2ZwB4tws";
	$ss = str_rot13($s);
	$s = strrev($ss);
	$_o = base64_decode($s);
	$_="";
	for ($_0=0;$_0<strlen($_o);$_0++){
		$_c = substr($_o,$_0,1);
		$__ = ord($_c) - 1;
		$_c = chr($__);
		$_ = $_.$_c;
	}
	print_r (strrev($_));
?>

#__author__ = 'Cser408'
import sys,base64
from string import maketrans
def rot13(data):
	intable = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
	outtable = 'NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm'
	table = maketrans(intable,outtable)
	return data.translate(table)
if __name__ == '__main__':
	data = sys.argv[1]
	data = rot13(data)
	data = data[::-1]
	data = base64.b64decode(data)
	result=''
	for i in data:
		result += chr(ord(i)-1)
	result = result[::-1]
	print result

来源：http://www.shiyanbar.com/ctf/writeup/347

 

what a fuck!这是什么鬼东西?

嗯，一种很特别的编码，仅用[]()!来编码js，利用浏览器自带的console来解决，Firefox就是firebug的工作台；chrome就是F12，选择console然后输入解密。

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这么一长串啊，就说的是一句话。。我觉得挺委屈的。。