full-disclosure - [FD] [AIT-SA-20200301-01] CVE-2020-9364: Directory Traversal in Creative Contact Form

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Message-ID: <6d73bb2e6f624a4a97135a63173ae8d8@ait.ac.at>
Date: Wed, 4 Mar 2020 12:40:57 +0000
From: sec-advisory <sec-advisory@....ac.at>
To: "fulldisclosure@...lists.org" <fulldisclosure@...lists.org>
Subject: [FD] [AIT-SA-20200301-01] CVE-2020-9364: Directory Traversal in
 Creative Contact Form

# Directory Traversal in Creative Contact Form

## Overview
* Identifier: AIT-SA-20200301-01
* Target: Creative Contact Form (for Joomla)
* Vendor: Creative Solutions
* Version: 4.6.2 (before Dec 03 2019)
* CVE: CVE-2020-9364
* Accessibility: Remote
* Severity: Critical
* Author: Wolfgang Hotwagner (AIT Austrian Institute of Technology)

## Summary
[Creative Contact Form](https://creative-solutions.net/) is a responsive jQuery contact form for the Joomla content-management-system. 

## Vulnerability Description
A directory traversal vulnerability resides inside the mailer component of the Creative Contact Form for Joomla. An attacker could exploit this vulnerability to receive any files from the server via e-mail.

The vulnerable code is located in "helpers/mailer.php" at line 290:
```
if(isset($_POST['creativecontactform_upload'])) {
if(is_array($_POST['creativecontactform_upload'])) {
foreach($_POST['creativecontactform_upload'] as $file) {

// echo $file.'--';
$file_path = JPATH_BASE . '/components/com_creativecontactform/views/creativeupload/files/'.$file;
$attach_files[] = $file_path;
}
}
}
```

If an attacker puts "../../../../../../../../etc/passwd" into $_POST['creativecontactform_upload'], and enables "Send me a copy", the contact-form would send him the content of /etc/passwd via email.

_Note: this vulnerability might not be exploitable in the free version of Creative Contact Form since it does not allow "Send copy to sender"._

## Vulnerable Versions
Creative Contact Form Personal/Professional/Business 4.6.2 (before Dec 3 2019)

## Impact
An unauthenticated attacker could receive any file from the server

## Mitigation
Update to the current version

## References:
*  https://nvd.nist.gov/vuln/detail/CVE-2020-9364

## Vendor Contact Timeline

* `2019-12-02` Contacting the vendor
* `2019-12-02` Vendor published a fixed version
* `2019-03-01` Public disclosure

## Advisory URL
[https://www.ait.ac.at/ait-sa-20200301-01-directory-traversal-in-creative-contact-form](https://www.ait.ac.at/ait-sa-20200301-01-directory-traversal-in-creative-contact-form)

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