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Hack The Box: Cronos

Cronos -

Target Enumeration:

OS: Linux


User: 51d236438b333970dbba7dc3089be33b

Root: 1703b8a3c9a8dde879942c79d02fd3a0

Ports / Services / Software versions running

22/tcp open  ssh OpenSSH 7.2p2 Ubuntu 4ubuntu2.1 (Ubuntu Linux; protocol 2.0)

53/tcp open  domain ISC BIND 9.10.3-P4-Ubuntu

80/tcp open  http Apache httpd 2.4.18 ((Ubuntu))

Vulnerability exploited:

SQL injection authentication bypass.

Command execution on authenticated webapp

Privilege escalation

Php cron service running as root.

Exploiting the host:


Check for dns records

Update /etc/hosts file with cronos.htb

Visit admin.cronos.htb

Login and fuzz the login with sqli in burp intruder.

These give a 302 redirect to /welcome.php so it is vulnerable to sqli authentication bypass.

This looks like it could be vulnerable to command injection.

Add ; id after the address.

Check we can write files to the system and look for other tools like wget nc etc to get a shell using touch test.php.

Generate a php reverse shell with msfconsole.

Download shell with wget

Execute the shell by visiting /vdk.php

Download all enumeration scripts to the system and run.

Checking the content of /etc/crontab shows a file running as root so we just need to copy our vdk shell to /var/www/laravel/artisan

Copy our php reverse shell to the dir, rename and make executable.

Ensure the php reverse shell is listening, after a brief period you should get a shell.

Collect the flags