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TryHackMe/En-pass.md
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TryHackMe/En-pass.md
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# TryHackMe-Enpass
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## Rustscan
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```
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rustscan -a 10.10.215.65 -- -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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Nmap? More like slowmap.🐢
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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 10.10.215.65:22
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Open 10.10.215.65:8001
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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 61 OpenSSH 7.2p2 Ubuntu 4ubuntu2.10 (Ubuntu Linux; protocol 2.0)
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| ssh-hostkey:
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| 2048 8a:bf:6b:1e:93:71:7c:99:04:59:d3:8d:81:04:af:46 (RSA)
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| ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCicax/djwvuiP5H2ET5UJCYL3Kp7ukHPJ0YWsSBUc6o8O/wwzOkz82yJRrZAff40NmLEpbvf0Sxw2JhrtoxDmdj+FSHpV/xDUG/nRE0FU10w
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DB75fYP4VFKR8QbzwDu6fxkgkZ3SAWZ9R1MgjN3B49hywgwqMRNtw+z2r2rXeF56y1FFKotBtK1wA223dJ8BLE+lRkAZd4nOr5HFMwrO+kWgYzfYJgSQ+5LEH4E/X7vWGqjdBIHSoYOUvzGJJmCu
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m2/MOQPoDw5B85Naw/aMQqsv7WM1mnTA34Z2eTO23HCKku5+Snf5amqVwHv8AfOFub0SS7AVfbIyP9fwv1psbP
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| 256 40:fd:0c:fc:0b:a8:f5:2d:b1:2e:34:81:e5:c7:a5:91 (ECDSA)
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| ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBENyLKEyFWN1XPyR2L1nyEK5QiqJAZTV2ntHTCZqMtXKkjsDM5H7KPJ5EcYg5Rp1zPzaDZxBmP
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P0pDF1Rhko7sw=
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| 256 7b:39:97:f0:6c:8a:ba:38:5f:48:7b:cc:da:72:a8:44 (ED25519)
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|_ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJmb0JdTeq8kjq+30Ztv/xe3wY49Jhc60LHfPd5yGiRx
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8001/tcp open http syn-ack ttl 61 Apache httpd 2.4.18 ((Ubuntu))
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| http-methods:
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|_ Supported Methods: OPTIONS GET HEAD POST
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|_http-server-header: Apache/2.4.18 (Ubuntu)
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|_http-title: En-Pass
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```
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So we have 2 ports open , 8001 (HTTP) and 22 (SSH)
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## PORT 8001 (HTTP)
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<img src="https://imgur.com/Dd8gkUf.png"/>
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At the the bottom of the page we see an ecrypted text
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<img src="https://imgur.com/qMP24xb.png"/>
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Which is ROT13
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<img src="https://imgur.com/MRbxT92.png"/>
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<img src="https://imgur.com/GTnGyfe.png"/>
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We have another text which is encrypted
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<img src="https://imgur.com/2W3Z44X.png"/>
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This again lead us to nowhere. So I decided to fuzz for directories
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<img src="https://imgur.com/GM4xKxS.png"/>
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Doing with feroxbuster I found that `/web` has more directories or files in it
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<img src="https://imgur.com/CO3aIlv.png"/>
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As we found `/reg.php`
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<img src="https://imgur.com/Hed312o.png"/>
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There's a input filed where we can type and submit.Trying for RCE by running `id` resulted incorrect
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<img src="https://imgur.com/KRZfCn6.png"/>
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<img src="https://imgur.com/46bVFWG.png"/>
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Looking at the source it's running a php script that is checking for input so here `!preg_ match('/[a-zA-Z0-9]/i` will reject the regular expression pattern for upper and lowercase characters also digits and `explode` is going to split the string into substring using `,`. Then the for loop will run 8 times and it's checking if the string's first character has a length of 2 and last character of the string which is 8th (starting from 0) character must be of length 3 then it's further checking that 5th character and 8th character must not be equal similarly for 3rd and 7th value.
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So this means we can only use special characters
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`@@,$,$,*,$,!,$,!,@@@`
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This will pass the checks as the value on the 0th index is of length 2 `@@`
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8th index value is of length 3 `@@@`
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Value at 5th index is not similar to the value at 8th index `! , @@@`
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And the value at 3rd index is not similar to value at 7th index `*,!`
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It's not necessary that this will be the exact string
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`$$,!,&,!,^,^,^,*,%%%` This can pass the checks as well
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On inputing the string
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<img src="https://imgur.com/9TjxTrS.png"/>
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While ferxobuster was running in the background there were directories upto `configure`
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<img src="https://imgur.com/IKjnlDP.png"/>
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I ran dirsearch again and finally found a file
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<img src="https://imgur.com/HcvSKzp.png"/>
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It's better to run other tools because gobuster was failing for me and feroxbuster didn't find the `key` file
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<img src="https://imgur.com/QqG3pEz.png"/>
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But I don't know the username so can't really ssh into the machine
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<img src="https://imgur.com/haYcBGb.png"/>
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<img src="https://imgur.com/wiBIpMt.png"/>
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These archives had the same files and some had recrusive archive with content `sadman`
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So we have the key which is passpharse of id_rsa and we also have the ssh private key so let's see if we can login
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<img src="https://imgur.com/xOqgOiL.png"/>
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And this gives us an error maybe `sandman` isn't the correct username. Looking at the hint we see that it's saying something about bypassing
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<img src="https://imgur.com/WtSDW73.png"/>
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We know that there is `403.php` page that gives us 403 status code which is `Forbidden client error`
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<img src="https://imgur.com/BhePlIu.png"/>
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So I googled for Bypasse scripts and found this so thought about trying and see if this lead us to somewhere
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<img src="https://imgur.com/FESweTX.png"/>
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I don't think this worked
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<img src="https://imgur.com/m7yKeKL.png"/>
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Then I used another script from github
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https://github.com/intrudir/403fuzzer
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<img src="https://imgur.com/UCTlgHE.png"/>
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You can see the status code is 200 but here focus on the length for 200 status code as this the home page (`/`)
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<img src="https://imgur.com/m6NYH9A.png"/>
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Here we see a change in length of status code 200 which is `917` so let's try using this as our url
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<img src="https://imgur.com/i38oAa2.png"/>
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And bingo we got the username so now let's ssh into the box
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<img src="https://imgur.com/J1StDYN.png"/>
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Transfer `psyp64` on the machine
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<img src="https://imgur.com/KhWJIkU.png"/>
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<img src="https://imgur.com/oCZDfBB.png"/>
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A cronjob for root user is running that first change the ownership of `file.yml` then runs the python script and then removes the file.yml also there exists a yaml deserialization vulnerability so we can make a payload for setting SUID on `/bin/bash`
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<img src="https://imgur.com/ht9eLu0.png"/>
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<img src="https://imgur.com/y8LrFCe.png"/>
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<img src="https://imgur.com/fcE3E3i.png"/>
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<img src="https://imgur.com/QlUzZIZ.png"/>
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We can grab the root flag !!
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