CVE-2017-5402 : Vulnerability Insights and Analysis

A use-after-free vulnerability in FontFace object events in Mozilla Firefox, Firefox ESR, and Thunderbird versions prior to specific versions can lead to exploitable crashes.

Understanding CVE-2017-5402

This CVE involves a use-after-free issue in FontFace object events, affecting various Mozilla products.

What is CVE-2017-5402?

A use-after-free vulnerability occurs when events are triggered for a FontFace object after it has been destroyed while working with fonts, potentially leading to exploitable crashes.

The Impact of CVE-2017-5402

The vulnerability affects older versions of Firefox, Firefox ESR, and Thunderbird, potentially allowing attackers to exploit the system.

Technical Details of CVE-2017-5402

This section provides more technical insights into the vulnerability.

Vulnerability Description

The use-after-free vulnerability arises when FontFace object events are fired after the object has been destroyed while handling fonts.

Affected Systems and Versions

Firefox versions older than 52
Firefox ESR versions older than 45.8
Thunderbird versions older than 52
Thunderbird versions older than 45.8

Exploitation Mechanism

Exploitation can occur when FontFace object events are triggered post object destruction, leading to potential system crashes.

Mitigation and Prevention

Protective measures to address and prevent the CVE-2017-5402 vulnerability.

Immediate Steps to Take

Update affected Mozilla products to versions 52 (or later) for Firefox and Thunderbird, and 45.8 (or later) for Firefox ESR.
Monitor security advisories for patches and updates from Mozilla.

Long-Term Security Practices

Regularly update software to the latest versions to mitigate known vulnerabilities.
Implement secure coding practices to prevent similar use-after-free issues.

Patching and Updates

Apply patches provided by Mozilla promptly to address the vulnerability and enhance system security.