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CVE-2021-21136 Explained : Impact and Mitigation

Learn about CVE-2021-21136, a Google Chrome vulnerability allowing remote attackers to extract cross-origin data. Understand the impact, technical details, and mitigation steps.

A detailed overview of CVE-2021-21136 focusing on the impact, technical details, and mitigation strategies.

Understanding CVE-2021-21136

Inadequate policy enforcement in WebView in Google Chrome on Android versions before 88.0.4324.96 resulted in a security vulnerability that could be exploited by a remote attacker.

What is CVE-2021-21136?

CVE-2021-21136 is a vulnerability in Google Chrome for Android that allowed malicious actors to extract cross-origin data using a specifically designed HTML page.

The Impact of CVE-2021-21136

This vulnerability could enable a remote attacker to access sensitive information across different origins, potentially compromising user privacy and security.

Technical Details of CVE-2021-21136

The specific details regarding the vulnerability, affected systems, and exploitation method.

Vulnerability Description

The flaw in WebView in Google Chrome for Android versions earlier than 88.0.4324.96 could lead to cross-origin data leaking by malicious HTML pages.

Affected Systems and Versions

Google Chrome browsers on Android devices with versions less than 88.0.4324.96 are susceptible to this security issue.

Exploitation Mechanism

By manipulating a crafted HTML page, a remote attacker could exploit this vulnerability to extract sensitive cross-origin data from the victim's browser.

Mitigation and Prevention

Actions to mitigate the risks posed by CVE-2021-21136 and prevent potential exploitation.

Immediate Steps to Take

Users should update their Google Chrome browser on Android to version 88.0.4324.96 or newer to address this vulnerability and enhance security.

Long-Term Security Practices

Regular software updates, security awareness training, and safe browsing habits can help prevent such vulnerabilities from being exploited.

Patching and Updates

Google has released a fix for this vulnerability in the form of version 88.0.4324.96 for Chrome on Android. It is crucial to apply patches and updates promptly to secure the browser against potential threats.

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