CVE-2019-11757 : Vulnerability Insights and Analysis

A security vulnerability impacting Firefox, Thunderbird, and Firefox ESR versions before specified releases.

Understanding CVE-2019-11757

A flaw that could lead to a crash and potential exploitation due to a use-after-free scenario.

What is CVE-2019-11757?

When following a value's prototype chain, it was possible to reference a locale, delete it, and then reference it again, causing a use-after-free issue.

The Impact of CVE-2019-11757

The vulnerability affects Firefox versions before 70, Thunderbird versions before 68.2, and Firefox ESR versions before 68.2.

Technical Details of CVE-2019-11757

A vulnerability related to creating index updates in IndexedDB.

Vulnerability Description

The flaw allows for a use-after-free scenario when handling index updates in IndexedDB.

Affected Systems and Versions

Firefox versions before 70
Thunderbird versions before 68.2
Firefox ESR versions before 68.2

Exploitation Mechanism

The issue arises when a value's prototype chain is manipulated, leading to a potential crash and exploit.

Mitigation and Prevention

Steps to address and prevent the vulnerability.

Immediate Steps to Take

Update affected software to versions 70 (Firefox), 68.2 (Thunderbird), and 68.2 (Firefox ESR).
Monitor for any unusual system behavior that could indicate exploitation.

Long-Term Security Practices

Regularly update software to the latest versions to patch known vulnerabilities.
Implement secure coding practices to prevent similar issues in the future.

Patching and Updates

Apply patches provided by Mozilla for Firefox, Thunderbird, and Firefox ESR to address the vulnerability.