CVE-2019-11743 : Security Advisory and Response

A vulnerability in Firefox, Thunderbird, and Firefox ESR versions prior to specified versions could lead to cross-origin information exposure through timing side-channel attacks.

Understanding CVE-2019-11743

This CVE highlights a flaw in the handling of navigation events that could potentially expose cross-origin information.

What is CVE-2019-11743?

Instances where navigation events did not align with the W3C's "Navigation-Timing Level 2" draft specification, specifically impacting the unload event.

The Impact of CVE-2019-11743

The vulnerability could allow for cross-origin information exposure through timing side-channel attacks.

Technical Details of CVE-2019-11743

A detailed look at the technical aspects of this vulnerability.

Vulnerability Description

Navigation events not fully adhering to the W3C's specification, potentially exposing cross-origin information.

Affected Systems and Versions

Firefox versions prior to 69
Thunderbird versions prior to 68.1 and 60.9
Firefox ESR versions prior to 60.9 and 68.1

Exploitation Mechanism

The flaw could be exploited through timing side-channel attacks, leading to cross-origin information exposure.

Mitigation and Prevention

Steps to mitigate and prevent exploitation of CVE-2019-11743.

Immediate Steps to Take

Update affected software to versions 69 (Firefox), 68.1 (Thunderbird), and 60.9 (Thunderbird and Firefox ESR).
Monitor for any unusual activities that could indicate exploitation.

Long-Term Security Practices

Regularly update software to the latest versions to patch known vulnerabilities.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

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