CVE-2019-9810 : What You Need to Know

A vulnerability has been discovered in the IonMonkey JIT compiler for the Array.prototype.slice method, potentially leading to a buffer overflow in Mozilla Firefox, Firefox ESR, and Thunderbird.

Understanding CVE-2019-9810

This CVE identifies a critical vulnerability affecting Mozilla products due to incorrect alias information in the IonMonkey JIT compiler.

What is CVE-2019-9810?

The vulnerability in the IonMonkey JIT compiler for the Array.prototype.slice method could allow attackers to trigger a missing bounds check, leading to a buffer overflow.

The Impact of CVE-2019-9810

The vulnerability affects versions of Firefox prior to 66.0.1, Firefox ESR prior to 60.6.1, and Thunderbird prior to 60.6.1, potentially enabling malicious actors to execute arbitrary code.

Technical Details of CVE-2019-9810

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability arises from incorrect alias information in the IonMonkey JIT compiler, specifically related to the Array.prototype.slice method.

Affected Systems and Versions

Firefox versions earlier than 66.0.1
Firefox ESR versions earlier than 60.6.1
Thunderbird versions earlier than 60.6.1

Exploitation Mechanism

The vulnerability could be exploited by crafting a malicious web page or email containing specially designed content to trigger the buffer overflow.

Mitigation and Prevention

Protecting systems from CVE-2019-9810 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Mozilla Firefox, Firefox ESR, and Thunderbird to versions 66.0.1, 60.6.1, and above, respectively.
Avoid clicking on suspicious links or downloading attachments from unknown sources.
Implement network security measures to detect and block malicious content.

Long-Term Security Practices

Regularly update software and applications to patch known vulnerabilities.
Educate users on safe browsing habits and the importance of software updates.

Patching and Updates

Ensure timely installation of security patches and updates provided by Mozilla to address the vulnerability.