CVE-2019-9792 : Vulnerability Insights and Analysis

A vulnerability in the IonMonkey JIT compiler affects Thunderbird, Firefox ESR, and Firefox, potentially leading to memory corruption and crashes.

Understanding CVE-2019-9792

This CVE involves a leakage of an internal JS_OPTIMIZED_OUT value to the active script, allowing for memory corruption.

What is CVE-2019-9792?

The vulnerability in the IonMonkey JIT compiler enables JavaScript to exploit a leaked value, causing memory corruption and potential crashes.

The Impact of CVE-2019-9792

The leaked value can lead to memory corruption, potentially resulting in crashes that could be exploited by attackers.

Technical Details of CVE-2019-9792

The vulnerability affects Thunderbird, Firefox ESR, and Firefox versions below specific thresholds.

Vulnerability Description

The IonMonkey JIT compiler leaks an internal JS_OPTIMIZED_OUT value to the script during a bailout, enabling memory corruption.

Affected Systems and Versions

Thunderbird < 60.6
Firefox ESR < 60.6
Firefox < 66

Exploitation Mechanism

JavaScript can utilize the leaked value to cause memory corruption, leading to potentially exploitable crashes.

Mitigation and Prevention

Taking immediate steps and implementing long-term security practices are crucial to mitigate the risks associated with CVE-2019-9792.

Immediate Steps to Take

Update Thunderbird, Firefox ESR, and Firefox to versions 60.6 and 66 or higher.
Monitor security advisories from Mozilla for patches and updates.

Long-Term Security Practices

Regularly update software to the latest versions to address security vulnerabilities.
Implement secure coding practices and conduct regular security audits.

Patching and Updates

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