CVE-2021-21163 : Security Advisory and Response
Learn about CVE-2021-21163 impacting Google Chrome on iOS, where an attacker can leak cross-origin data via crafted HTML pages. Find out the impact, affected versions, and mitigation steps.
Google Chrome on iOS prior to version 89.0.4389.72 is affected by an insufficient data validation vulnerability in Reader Mode. An attacker could exploit this flaw to leak cross-origin data through a crafted HTML page and a malicious server.
Understanding CVE-2021-21163
This section provides insights into the impact and technical details of the CVE-2021-21163 vulnerability.
What is CVE-2021-21163?
The CVE-2021-21163 vulnerability in Google Chrome on iOS allows a remote attacker to leak cross-origin data by manipulating Reader Mode with a specially crafted HTML page and a malicious server.
The Impact of CVE-2021-21163
The impact of CVE-2021-21163 is significant as it enables attackers to access sensitive cross-origin data through a specific exploitation technique.
Technical Details of CVE-2021-21163
Let's delve into the technical specifics of the CVE-2021-21163 vulnerability.
Vulnerability Description
The vulnerability in Reader Mode in Google Chrome on iOS arises from inadequate data validation, leading to the leakage of cross-origin data via a maliciously customized HTML page and server.
Affected Systems and Versions
Google Chrome versions prior to 89.0.4389.72 on iOS are affected by this vulnerability in Reader Mode.
Exploitation Mechanism
The exploitation of CVE-2021-21163 involves manipulating Reader Mode with a crafted HTML page and a malicious server to facilitate the leakage of cross-origin data.
Mitigation and Prevention
This section outlines the steps to mitigate and prevent the risks associated with CVE-2021-21163.
Immediate Steps to Take
Users are advised to update Google Chrome on iOS to version 89.0.4389.72 or newer to mitigate the risk of data leakage through Reader Mode.
Long-Term Security Practices
Implementing secure browsing habits, avoiding untrusted websites, and staying proactive with browser updates can help enhance long-term security against similar vulnerabilities.
Patching and Updates
Regularly installing security patches and updates for Google Chrome ensures that known vulnerabilities like CVE-2021-21163 are addressed promptly.