CVE-2017-5427 : Vulnerability Insights and Analysis

A vulnerability in Firefox versions older than 52 allows a malicious user to load non-existent chrome.manifest files during startup, potentially introducing harmful software into the system.

Understanding CVE-2017-5427

What is CVE-2017-5427?

This CVE refers to a security flaw in Firefox versions prior to 52, where the browser attempts to load a chrome.manifest file during startup, even if it does not exist. This could be exploited by a local attacker to introduce unauthorized software into the system.

The Impact of CVE-2017-5427

The vulnerability could lead to the execution of unauthorized and potentially harmful software on the system without the user's consent or modification of existing files.

Technical Details of CVE-2017-5427

Vulnerability Description

During Firefox startup, the browser tries to load a chrome.manifest file from the main installation directory, even if it is not present. This could allow a malicious user to plant the file and associated files, triggering their execution during startup.

Affected Systems and Versions

Product: Firefox
Vendor: Mozilla
Versions Affected: < 52

Exploitation Mechanism

A local attacker can place a fake chrome.manifest file in the installation directory, leading Firefox to load and execute the malicious content during startup.

Mitigation and Prevention

Immediate Steps to Take

Update Firefox to a version equal to or newer than 52 to mitigate the vulnerability.
Regularly monitor for unauthorized changes in the installation directory.

Long-Term Security Practices

Implement strict access controls to prevent unauthorized access to critical directories.
Educate users about the risks of downloading and executing files from untrusted sources.

Patching and Updates

Stay informed about security advisories from Mozilla and promptly apply recommended patches and updates.