CVE-2020-12420 : What You Need to Know

A vulnerability in Firefox ESR, Firefox, and Thunderbird could lead to memory corruption and potentially exploitable crashes.

Understanding CVE-2020-12420

This CVE involves a use-after-free vulnerability when attempting to connect to a STUN server.

What is CVE-2020-12420?

When connecting to a STUN server, a race condition could trigger a use-after-free of a pointer, resulting in memory corruption and a potentially exploitable crash.

The Impact of CVE-2020-12420

The vulnerability affects Firefox ESR < 68.10, Firefox < 78, and Thunderbird < 68.10.0.

Technical Details of CVE-2020-12420

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The vulnerability arises from a race condition causing a use-after-free scenario when connecting to a STUN server.

Affected Systems and Versions

Firefox ESR < 68.10
Firefox < 78
Thunderbird < 68.10.0

Exploitation Mechanism

The vulnerability can be exploited by triggering the race condition during connection to a STUN server.

Mitigation and Prevention

Protecting systems from CVE-2020-12420 is crucial to prevent potential exploitation.

Immediate Steps to Take

Update Firefox ESR, Firefox, and Thunderbird to versions 68.10, 78, and 68.10.0 or higher.
Monitor vendor advisories for patches and security updates.

Long-Term Security Practices

Regularly update software to the latest versions.
Implement network security measures to detect and prevent exploitation attempts.

Patching and Updates

Apply patches provided by Mozilla promptly to address the vulnerability.