上傳繞過
很不錯的一種題型，就是文件上傳有很多漏洞設法，這里是路徑問題，測試發現，不檢查類型參數，不檢查內容，只檢查后綴:
所以文件名怎么都得是“.jpg .gif .png”結尾，但是路徑/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:
你能跨過去嗎
偽XSS題，就是把那個提示的鏈接：
http://www.test.com/NodeMore.jsp?id=672613&page=2&pageCounter=32&undefined&callback=%2b/v%2b%20%2bADwAcwBjAHIAaQBwAHQAPgBhAGwAZQByAHQAKAAiAGsAZQB5ADoALwAlAG4AcwBmAG8AYwB1AHMAWABTAFMAdABlAHMAdAAlAC8AIgApADwALwBzAGMAcgBpAHAAdAA%2bAC0-&_=1302746925413
里面弄出來，根據編碼經驗，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編碼，取
“ADwAcwBjAHIAaQBwAHQAPgBhAGwAZQByAHQAKAAiAGsAZQB5ADoALwAlAG4AcwBmAG8AYwB1AHMAWABTAFMAdABlAHMAdAAlAC8AIgApADwALwBzAGMAcgBpAHAAdAA+”
做base64解密：
跪倒在burpsuite下。。
PHP大法
還是編碼的問題，先根據提示查臨時文件
<?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?
也就是一開始要相等，后來要不等，，二次編碼，你懂得，其實剛去服務器會自動解碼一次的。
id=%2568%2561%2563%256b%2565%2572%2544%254a
OK
NSCTF web200
就是再跑一遍就好的意思。。
給了加密過程和密文，自己編寫解密就好：
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
來源：http://www.shiyanbar.com/ctf/writeup/347
what a fuck!這是什么鬼東西?
嗯，一種很特別的編碼，僅用[]()!來編碼js，利用瀏覽器自帶的console來解決，Firefox就是firebug的工作台；chrome就是F12，選擇console然后輸入解密。
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這么一長串啊，就說的是一句話。。我覺得挺委屈的。。