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CVE-2021-21164 : Exploit Details and Defense Strategies

Learn about CVE-2021-21164, an insufficient data validation vulnerability in Chrome on iOS allowing attackers to leak cross-origin data. Find out the impact, technical details, affected systems, and mitigation steps.

An insufficient data validation vulnerability in Chrome on iOS allowed a remote attacker to leak cross-origin data via a crafted HTML page. Here is a detailed overview of CVE-2021-21164 and its implications.

Understanding CVE-2021-21164

CVE-2021-21164 is an insufficient data validation vulnerability in Chrome on iOS that could be exploited by a remote attacker to leak cross-origin data by manipulating HTML pages.

What is CVE-2021-21164?

CVE-2021-21164 is a security vulnerability in Google Chrome on iOS that existed prior to version 89.0.4389.72. It stems from insufficient data validation, enabling attackers to extract cross-origin data.

The Impact of CVE-2021-21164

The impact of this vulnerability is significant as it allows remote attackers to access sensitive cross-origin data through manipulated HTML pages. This breach can lead to unauthorized data leakage and potential privacy violations.

Technical Details of CVE-2021-21164

Here are specific technical aspects of the CVE-2021-21164 vulnerability.

Vulnerability Description

The vulnerability arises from insufficient data validation in Chrome on iOS, affecting versions prior to 89.0.4389.72. Attackers exploit this flaw to extract cross-origin data through maliciously crafted HTML pages.

Affected Systems and Versions

Google Chrome on iOS versions less than 89.0.4389.72 is vulnerable to this exploit. Users of these versions are at risk of having their cross-origin data leaked by remote attackers.

Exploitation Mechanism

Remote attackers can exploit this vulnerability by creating specially crafted HTML pages that, when accessed by a user using a vulnerable Chrome version, facilitate the leakage of cross-origin data.

Mitigation and Prevention

Protecting your systems from CVE-2021-21164 requires immediate action and long-term security measures.

Immediate Steps to Take

        Update Chrome on iOS to version 89.0.4389.72 or later to patch the vulnerability and prevent data leakage.
        Avoid visiting unfamiliar or suspicious websites to minimize the risk of encountering crafted HTML pages.

Long-Term Security Practices

        Regularly update your browsers and devices to the latest versions to mitigate known vulnerabilities and enhance security.
        Stay vigilant against phishing attempts and only interact with trusted websites and sources to minimize exposure to potential threats.

Patching and Updates

Stay informed about security advisories and updates from Google Chrome to promptly address any future vulnerabilities and ensure the ongoing protection of your systems.

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