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。。