PHP

This post documents my process for solving the Toxic box on Hack The Box. This box is all about PHP insecure deserialization, exploiting LFI, and using log poisoning to achieve remote code execution. Synopsis PHP insecure deserialization to LFI that abuses log poisoning for RCE. Learning References: https://ianpeter.medium.com/exploiting-log-poisoning-through-lfi-and-serialization-in-php-e039e7b126ad The official writeup I wasn’t sure what to do at first, so I checked the writeup after struggling for a while. Challenge Analysis & Source Code Review The web page didn’t reveal much, but looking at the source code, you see: ...

This post documents my process for solving the LoveTok box on Hack The Box. The challenge involves analyzing PHP source code, understanding the misuse of addslashes, and exploiting command injection through the eval function. Description True love is tough, and even harder to find. Once the sun has set, the lights close and the bell has rung… you find yourself licking your wounds and contemplating human existence. You wish to have somebody important in your life to share the experiences that come with it, the good and the bad. This is why we made LoveTok, the brand new service that accurately predicts in the threshold of milliseconds when love will come knockin’ (at your door). Come and check it out, but don’t try to cheat love because love cheats back. ...

This is a challenge from webhacking.kr. As the name of the website suggests, it is about SQL injection. You can check the source code of the page: <?php if($_GET['no']){ $db = dbconnect(); if(preg_match("/ |\/|\(|\)|\||&|select|from|0x/i",$_GET['no'])) exit("no hack"); $result = mysqli_fetch_array(mysqli_query($db,"select id from chall18 where id='guest' and no=$_GET[no]")); // admin's no = 2 if($result['id']=="guest") echo "hi guest"; if($result['id']=="admin"){ solve(18); echo "hi admin!"; } } ?> Our goal seems to be creating a payload that would make the id value admin and also make the no value 2. So, let’s assume that there is no filter so we can enter anything as a payload. When we enter 2 as our input, you will see something like this: ...