mirror of
https://github.com/AbdullahRizwan101/CTF-Writeups
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180 lines
8.3 KiB
Markdown
180 lines
8.3 KiB
Markdown
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# TryHackMe-Archangel
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## Rustscan
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```
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rustscan -a 10.10.53.100 -- -A -sC -sV
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.----. .-. .-. .----..---. .----. .---. .--. .-. .-.
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| {} }| { } |{ {__ {_ _}{ {__ / ___} / {} \ | `| |
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| .-. \| {_} |.-._} } | | .-._} }\ }/ /\ \| |\ |
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`-' `-'`-----'`----' `-' `----' `---' `-' `-'`-' `-'
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The Modern Day Port Scanner.
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________________________________________
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: https://discord.gg/GFrQsGy :
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: https://github.com/RustScan/RustScan :
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--------------------------------------
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😵 https://admin.tryhackme.com
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[~] The config file is expected to be at "/root/.rustscan.toml"
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[!] File limit is lower than default batch size. Consider upping with --ulimit. May cause harm to sensitive servers
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[!] Your file limit is very small, which negatively impacts RustScan's speed. Use the Docker image, or up the Ulimit with '--ulimit 5000'.
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Open 10.10.53.100:22
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Open 10.10.53.100:80
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[~] Starting Script(s)
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[>] Script to be run Some("nmap -vvv -p {{port}} {{ip}}")
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PORT STATE SERVICE REASON VERSION
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22/tcp open ssh syn-ack ttl 63 OpenSSH 7.6p1 Ubuntu 4ubuntu0.3 (Ubuntu Linux; protocol 2.0)
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| ssh-hostkey:
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| 2048 9f:1d:2c:9d:6c:a4:0e:46:40:50:6f:ed:cf:1c:f3:8c (RSA)
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| ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDPrwb4vLZ/CJqefgxZMUh3zsubjXMLrKYpP8Oy5jNSRaZynNICWMQNfcuLZ2GZbR84iEQJrNqCFcbsgD+4OPyy0TXV1biJExck3OlriDBn3g
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9trxh6qcHTBKoUMM3CnEJtuaZ1ZPmmebbRGyrG03jzIow+w2updsJ3C0nkUxdSQ7FaNxwYOZ5S3X5XdLw2RXu/o130fs6qmFYYTm2qii6Ilf5EkyffeYRc8SbPpZKoEpT7TQ08VYEICier9ND408
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kGERHinsVtBDkaCec3XmWXkFsOJUdW4BYVhrD3M8JBvL1kPmReOnx8Q7JX2JpGDenXNOjEBS3BIX2vjj17Qo3V
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| 256 63:73:27:c7:61:04:25:6a:08:70:7a:36:b2:f2:84:0d (ECDSA)
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| ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBKhhd/akQ2OLPa2ogtMy7V/GEqDyDz8IZZQ+266QEHke6vdC9papydu1wlbdtMVdOPx1S6zxA4
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CzyrcIwDQSiCg=
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| 256 b6:4e:d2:9c:37:85:d6:76:53:e8:c4:e0:48:1c:ae:6c (ED25519)
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|_ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBE3FV9PrmRlGbT2XSUjGvDjlWoA/7nPoHjcCXLer12O
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80/tcp open http syn-ack ttl 63 Apache httpd 2.4.29 ((Ubuntu))
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| http-methods:
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|_ Supported Methods: GET POST OPTIONS HEAD
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|_http-server-header: Apache/2.4.29 (Ubuntu)
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|_http-title: Wavefire
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Warning: OSScan results may be unreliable because we could not find at least 1 open and 1 closed port
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```
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## PORT 80 (HTTP)
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<img src="https://imgur.com/GzEgNx0.png"/>
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Looking at the source code we can find a domain name
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<img src="https://imgur.com/iJy5GmF.png"/>
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So lets put this is in our `/etc/hosts` file
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<img src="https://imgur.com/AHoDyxC.png"/>
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<img src="https://imgur.com/7xaEQXU.png"/>
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Now we need to fuzz for a page that is "under development" for that I am going to use gobuster
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<img src="https://imgur.com/4lPUfzJ.png"/>
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And we found a `test.php` file
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<img src="https://imgur.com/Gd2C9KU.png"/>
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<img src="https://imgur.com/Uu36x36.png"/>
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On clicking the button we can see on the url there's a GET parameter being used so we can check for LFI (Local File Inclusion) vulnerability. I tired a bunch of LFI techniques like `../../../../etc/passwd` but it failed.
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<img src="https://imgur.com/Q0shF8C.png"/>
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I used this technqiue what it does is that encodes the whole page into base64.
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`http://mafialive.thm/test.php?view=php://filter/convert.base64-encode/resource=/var/www/html/development_testing/mrrobot.php`
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<img src="https://imgur.com/xX2Ztjv.png"/>
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We can do this for `test.php` as well
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`http://mafialive.thm/test.php?view=php://filter/convert.base64-encode/resource=/var/www/html/development_testing/test.php`
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<img src="https://imgur.com/XCpP94e.png"/>
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<img src="https://imgur.com/fC8HCUD.png"/>
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<img src="https://imgur.com/1JepDNl.png"/>
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We can fuzz for /etc/passwd to do that we can use `wfuzz`
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```
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http://mafialive.thm/test.php?view=/var/www/html/development_testing/test.php
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```
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<img src="https://imgur.com/9w9mWwk.png"/>
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This doesn't help as we are getting the length of the response 286 and 310 which is not /etc/passwd so we can hide that response
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<img src='https://imgur.com/ezKJMsw.png'/>
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<img src="https://imgur.com/iy2dgWl.png"/>
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For getting a reverse shell we need to poison the apach2 log file but before that we need to make sure that log is being accessbile.
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<img src="https://imgur.com/CmWeia2.png"/>
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We can access the log by the method above
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```
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http://mafialive.thm/test.php?view=/var/www/html/development_testing./.././.././.././..///var/log/apache2/access.log
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```
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<img src="https://imgur.com/HZQn93g.png"/>
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Now intercept the request through burp suite and add php GET parameter code in `User-Agent`
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<img src="https://imgur.com/VfRxInb.png"/>
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Let's try to access the page with `&c=id` at the end
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```
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http://mafialive.thm/test.php?view=/var/www/html/development_testing./.././.././.././..///var/log/apache2/access.log&c=id
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```
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<img src="https://imgur.com/Z7nw5hi.png"/>
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We can at the bottom of the page that id command was executed so we can now get a reverse shell
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Host a file having a reverse shell payload in it
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<img src="https://imgur.com/IhO8kGi.png"/>
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<img src="https://imgur.com/2H5eTG1.png"/>
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On running the command
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<img src="https://imgur.com/qKInj6U.png"/>
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Now we need to give it permission to execute
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<img src="https://imgur.com/hxszvFV.png"/>
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Execute it
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<img src="https://imgur.com/0U7ipES.png"/>
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<img src="https://imgur.com/Cp5PN7m.png"/>
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Checking cronjobs we see
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<img src="https://imgur.com/lf6TYXh.png"/>
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<img src="https://imgur.com/jzVwAJp.png"/>
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We can see that this file can be written by anyone so we can write bash reverse shell to get a shell as user `archangel`
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<img src="https://imgur.com/e58k880.png"/>
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And we got the shell
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<img src="https://imgur.com/BFlBYEC.png"/>
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We can see `backup` binary having a SUID also it belongs to root user and group , on using strings on it
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<img src="https://imgur.com/uug0IBR.png"/>
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We can see that it's using cp (copy command) so here PATH exploitation comes where we can create a binary with the same name having `bash` in it and then set PATH where that "fake" binary is stored
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<img src="https://imgur.com/RaY1lES.png"/>
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<img src="https://imgur.com/z6VnV18.png"/>
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Now run that binary
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<img src="https://imgur.com/qbDuXBW.png"/>
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For simplicity I made /bin/bash a SUID to run as root
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<img src="https://imgur.com/AKUekJQ.png"/>
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