Learn about CVE-2021-21217 where Google Chrome prior to 90.0.4430.72 is vulnerable to data extraction attacks via crafted PDF files. Find out the impact, technical details, and mitigation steps.
A detailed article outlining CVE-2021-21217, a vulnerability in Google Chrome that allowed a remote attacker to access sensitive information by exploiting PDFium.
Understanding CVE-2021-21217
CVE-2021-21217 refers to uninitialized data in PDFium in Google Chrome prior to version 90.0.4430.72, enabling a remote attacker to potentially extract sensitive data through a maliciously crafted PDF file.
What is CVE-2021-21217?
The vulnerability arises from uninitialized data in PDFium, a component of Google Chrome. Attackers can leverage this flaw to extract sensitive information from process memory by tricking users into opening a specially-crafted PDF file.
The Impact of CVE-2021-21217
The impact of this vulnerability is significant as it allows remote attackers to access potentially sensitive information contained in process memory. This could lead to unauthorized access to private user data and compromise user privacy and security.
Technical Details of CVE-2021-21217
This section delves deeper into the technical aspects of CVE-2021-21217.
Vulnerability Description
The vulnerability in PDFium before Chrome version 90.0.4430.72 enables uninitialized data exposure. It facilitates remote attackers in extracting confidential data by exploiting flaws in PDF processing.
Affected Systems and Versions
Google Chrome versions prior to 90.0.4430.72 are impacted by CVE-2021-21217. Users using these versions are vulnerable to potential data extraction attacks through malicious PDF files.
Exploitation Mechanism
Attackers can exploit this vulnerability by crafting a PDF file designed to trigger the uninitialized data in PDFium. When a user opens this malicious file using an affected Chrome version, the attacker can potentially extract sensitive information.
Mitigation and Prevention
Discover the steps to mitigate and prevent exploitation of CVE-2021-21217.
Immediate Steps to Take
Users must update their Google Chrome browser to version 90.0.4430.72 or newer to patch the vulnerability. Avoid opening PDF files from untrusted or unknown sources to prevent potential attacks.
Long-Term Security Practices
Enforce a robust security policy by regularly updating software, conducting security awareness training, and implementing secure browsing practices to fortify defenses against similar vulnerabilities.
Patching and Updates
Stay informed about security updates and patches released by Google Chrome. Regularly update the browser to ensure the latest security enhancements are applied to protect against known vulnerabilities.