CVE-2021-29953 : Security Advisory and Response

A Universal Cross-Site Scripting vulnerability in Firefox for Android versions less than 88.1.3 allowed malicious webpages to execute attacker-controlled JavaScript on the user's device.

Understanding CVE-2021-29953

This CVE refers to a security vulnerability found in Firefox for Android that could lead to Universal Cross-Site Scripting attacks.

What is CVE-2021-29953?

CVE-2021-29953 is a vulnerability that allowed a malicious webpage to run attacker-controlled JavaScript on Firefox for Android, potentially compromising user data and privacy.

The Impact of CVE-2021-29953

This vulnerability could be exploited by threat actors to conduct Universal Cross-Site Scripting attacks, posing a significant risk to user information and device security.

Technical Details of CVE-2021-29953

The technical details of this CVE include:

Vulnerability Description

A malicious webpage could force Firefox for Android users into executing attacker-controlled JavaScript, leading to a Universal Cross-Site Scripting vulnerability.

Affected Systems and Versions

Affected systems include Firefox for Android versions less than 88.1.3.

Exploitation Mechanism

By tricking users into visiting a malicious webpage, attackers could execute JavaScript code in the context of another domain, exploiting the vulnerability.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-29953, users can take the following steps:

Immediate Steps to Take

Update Firefox for Android to version 88.1.3 or higher.
Avoid clicking on suspicious links or visiting unknown websites.

Long-Term Security Practices

Regularly update browsers and software to patch known vulnerabilities.
Enable browser security features such as pop-up blockers and JavaScript restrictions.

Patching and Updates

Stay informed about security advisories from Mozilla and apply patches promptly to protect your device from potential threats.