CVE-2019-9795 : What You Need to Know
Learn about CVE-2019-9795, a security weakness in IonMonkey JIT compiler affecting Thunderbird, Firefox ESR, and Firefox versions below specified thresholds. Find out how to mitigate this vulnerability.
A security weakness in the IonMonkey just-in-time (JIT) compiler affects Thunderbird, Firefox ESR, and Firefox versions below specified thresholds.
Understanding CVE-2019-9795
What is CVE-2019-9795?
This CVE identifies a vulnerability in the IonMonkey JIT compiler that could be exploited by malicious JavaScript to cause a potentially exploitable crash.
The Impact of CVE-2019-9795
The vulnerability affects Thunderbird versions below 60.6, Firefox ESR versions below 60.6, and Firefox versions below 66.
Technical Details of CVE-2019-9795
Vulnerability Description
The vulnerability involves type-confusion in the IonMonkey JIT compiler, enabling malicious JavaScript to trigger a crash.
Affected Systems and Versions
- Thunderbird versions less than 60.6
- Firefox ESR versions less than 60.6
- Firefox versions less than 66
Exploitation Mechanism
Malicious JavaScript can exploit the vulnerability in the IonMonkey JIT compiler to cause a crash.
Mitigation and Prevention
Immediate Steps to Take
- Update Thunderbird, Firefox ESR, and Firefox to versions 60.6 and 66 respectively.
- Be cautious while browsing potentially malicious websites.
Long-Term Security Practices
- Regularly update software to patch vulnerabilities.
- Implement security measures to detect and prevent malicious scripts.
Patching and Updates
Apply security patches provided by Mozilla to address the vulnerability.