CVE-2019-12383 : Security Advisory and Response

An information exposure vulnerability exists in Tor Browser versions earlier than 8.0.1. This vulnerability enables remote attackers to determine the user interface language by measuring the width of a button, regardless of the user's "Don't send my language" setting.

Understanding CVE-2019-12383

This CVE identifies an information exposure vulnerability in specific versions of Tor Browser.

What is CVE-2019-12383?

CVE-2019-12383 is a security vulnerability found in Tor Browser versions prior to 8.0.1 that allows remote attackers to ascertain the user's UI language by exploiting a button width measurement.

The Impact of CVE-2019-12383

The vulnerability can be exploited by malicious actors to determine the user's interface language, compromising user privacy and potentially aiding in targeted attacks.

Technical Details of CVE-2019-12383

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability in Tor Browser versions before 8.0.1 allows remote attackers to discern the browser's UI locale by measuring the width of a button, even if the user has set the "Don't send my language" option.

Affected Systems and Versions

Tor Browser versions earlier than 8.0.1

Exploitation Mechanism

Remote attackers measure the width of a button to determine the user's UI language.

Mitigation and Prevention

Protective measures and actions to mitigate the risks associated with CVE-2019-12383.

Immediate Steps to Take

Update Tor Browser to version 8.0.1 or later to patch the vulnerability.
Avoid visiting untrusted websites or clicking on suspicious links.

Long-Term Security Practices

Regularly update software and applications to the latest versions.
Enable security features like firewalls and antivirus programs to enhance protection.

Patching and Updates

Stay informed about security updates for Tor Browser and apply patches promptly to address known vulnerabilities.