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CVE-2020-6805 : What You Need to Know

Learn about CVE-2020-6805, a use-after-free vulnerability affecting Thunderbird, Firefox, and Firefox ESR versions, potentially leading to exploitable crashes. Find out how to mitigate this security risk.

A use-after-free vulnerability affecting Thunderbird, Firefox, and Firefox ESR versions, potentially leading to exploitable crashes.

Understanding CVE-2020-6805

What is CVE-2020-6805?

When removing data about an origin whose tab was recently closed, a use-after-free vulnerability could occur in the Quota manager, leading to potentially exploitable crashes in Thunderbird, Firefox, and Firefox ESR.

The Impact of CVE-2020-6805

This vulnerability could be exploited to cause a crash, potentially leading to arbitrary code execution.

Technical Details of CVE-2020-6805

Vulnerability Description

A use-after-free vulnerability in the Quota manager when removing data about closed tabs.

Affected Systems and Versions

        Thunderbird < 68.6
        Firefox < 74, Firefox < ESR68.6
        Firefox ESR < 68.6

Exploitation Mechanism

The vulnerability can be exploited by an attacker to trigger a use-after-free condition, potentially leading to a crash or arbitrary code execution.

Mitigation and Prevention

Immediate Steps to Take

        Update Thunderbird, Firefox, and Firefox ESR to versions 68.6, 74, and ESR68.6 respectively.
        Avoid visiting untrusted websites or clicking on suspicious links.

Long-Term Security Practices

        Regularly update software and apply security patches promptly.
        Implement proper security measures such as firewalls and antivirus programs.

Patching and Updates

Ensure that all systems running Thunderbird, Firefox, and Firefox ESR are updated to the latest patched versions to mitigate the vulnerability.

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