CVE-2021-22916 Explained : Impact and Mitigation

In Brave Desktop versions 1.17 to 1.26.60, a vulnerability exists where adblocking, when combined with a proxy browser extension, may lead to information disclosure due to incorrect DNS requests.

Understanding CVE-2021-22916

This CVE highlights an issue in Brave Desktop that could potentially expose sensitive information when specific conditions are met.

What is CVE-2021-22916?

The vulnerability in Brave Desktop versions between 1.17 and 1.26.60 allows DNS requests from the CNAME adblocking feature to utilize the system DNS settings instead of the proxy extension settings, potentially revealing sensitive data.

The Impact of CVE-2021-22916

Exploitation of this vulnerability could result in information disclosure, where user data may be exposed due to the mishandling of DNS requests by the adblocking feature.

Technical Details of CVE-2021-22916

This section delves into the specifics of the vulnerability.

Vulnerability Description

The issue arises when adblocking and a proxy browser extension are concurrently active, causing DNS requests to bypass the proxy settings and utilize system DNS, leading to a risk of sensitive data exposure.

Affected Systems and Versions

Brave Desktop versions 1.17 to 1.26.60 are affected by this vulnerability, impacting users who have adblocking enabled alongside a proxy browser extension.

Exploitation Mechanism

By exploiting this vulnerability, threat actors could potentially intercept DNS requests and gain access to sensitive information that was intended to be secure.

Mitigation and Prevention

Discover the necessary steps to secure your system.

Immediate Steps to Take

Users are advised to update Brave Desktop to version 1.26.60 or newer to mitigate the risk of information disclosure through DNS requests.

Long-Term Security Practices

In the long run, users are encouraged to regularly update their software, employ additional security measures, and be cautious when using adblocking and browser extensions.

Patching and Updates

Regularly check for and apply software updates to ensure that known vulnerabilities are addressed promptly.