(Original references: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-45415, https://www.mozilla.org/en-US/security/advisories/mfsa2022-03/)


A new vulnerability has been discovered in the Mozilla Firefox web browser. It's called CVE-2022-45415 and is a serious security issue that could potentially compromise your computer if exploited. In this article, we'll look at what this vulnerability is, how it works, and what you can do to protect yourself.

The Vulnerability

When downloading an HTML file using Firefox (version less than 107), if the title of the page was formatted as a filename with a malicious extension, Firefox may have saved the file with that extension. This could lead to a system compromise if the downloaded file was later executed by the user.

Here's an example of this kind of attack scenario

1. The user clicks on a seemingly legitimate link that leads to an HTML file with a crafted title attribute.

The malicious HTML file has a title like "Important_Document.exe".

3. When downloading the file, Firefox saves it as "Important_Document.exe" instead of a regular HTML file.

Code Snippet

To illustrate this vulnerability, here's a simple code snippet showing the structure of a malicious HTML file:

<!DOCTYPE html>
  <h1>Important Document</h1>
  <p>This file appears to be a document, but it is actually an executable file containing malicious code.</p>

Exploit Details

The exploitation of this vulnerability involves tricking users into downloading a harmful file disguised as something innocuous. This attack could be performed through phishing emails or other social engineering techniques, enticing users to click on the malicious link.

Once the user downloads the file, the attacker relies on the user to execute the file either unknowingly or out of curiosity. This could lead to a system compromise, with the potential for data theft, unauthorized system access, or other malicious activities.


To protect yourself from this vulnerability, it is crucial to update your Firefox web browser to the latest version (107 or higher). Updated versions of Firefox have addressed this issue and no longer allow the unintended behavior when saving the HTML file with a malicious extension. You can download the latest version of Firefox directly from Mozilla's website: https://www.mozilla.org/en-US/firefox/new/.

Additionally, practicing general safe browsing habits can further reduce the risk of falling victim to this vulnerability:


The CVE-2022-45415 vulnerability presents a significant security risk to Firefox users with versions less than 107. By taking the necessary steps to update and adopt safe browsing practices, you can protect yourself and your system from potential harm. Stay informed and always be cautious when downloading files or clicking links, as it could save you from potential cybersecurity threats.


Published on: 12/22/2022 20:15:00 UTC
Last modified on: 12/30/2022 22:13:00 UTC