CVE-2022-26386 Explained : Impact and Mitigation

A vulnerability in Firefox ESR and Thunderbird that could allow local users to access temporary files downloaded to a shared directory.

Understanding CVE-2022-26386

This CVE impacts Firefox ESR versions less than 91.7 and Thunderbird versions less than 91.7.

What is CVE-2022-26386?

Firefox for macOS and Linux previously downloaded temporary files to a shared directory in <code>/tmp</code>, enabling local users to access these files. The behavior was changed to make the files accessible by other local users, posing a security risk.

The Impact of CVE-2022-26386

The vulnerability allows local users on shared systems to view and potentially manipulate files downloaded by Firefox and Thunderbird, compromising user privacy and system security.

Technical Details of CVE-2022-26386

Vulnerability Description

The vulnerability stems from the incorrect download location of temporary files in Firefox ESR and Thunderbird, allowing unauthorized access by local users.

Affected Systems and Versions

Mozilla Firefox ESR versions less than 91.7
Mozilla Thunderbird versions less than 91.7

Exploitation Mechanism

Local users on the affected systems can exploit the vulnerability to view and interact with temporary files downloaded by Firefox and Thunderbird.

Mitigation and Prevention

Immediate Steps to Take

Users are advised to update their Mozilla Firefox ESR and Thunderbird installations to versions 91.7 or higher to mitigate the vulnerability.

Long-Term Security Practices

Ensure regular updates for Firefox and Thunderbird to patch security vulnerabilities promptly and maintain a secure browsing environment.

Patching and Updates

Refer to Mozilla's security advisories for the latest updates and patches to address CVE-2022-26386.