Learn about CVE-2021-21831, a critical use-after-free vulnerability in Foxit PDF Reader version 10.1.3.37598, allowing attackers to execute arbitrary code via specially crafted PDF files or malicious websites.
A detailed overview of CVE-2021-21831, a use-after-free vulnerability in Foxit Software's PDF Reader that can lead to arbitrary code execution when a specially crafted PDF document is opened or a malicious site is visited.
Understanding CVE-2021-21831
This section provides insights into the nature of the vulnerability and its potential impact.
What is CVE-2021-21831?
CVE-2021-21831 is a use-after-free vulnerability in Foxit Software’s PDF Reader version 10.1.3.37598. This flaw allows an attacker to reuse freed memory by manipulating a PDF document or a web browser plugin, leading to potential arbitrary code execution.
The Impact of CVE-2021-21831
The vulnerability poses a high risk with a CVSS base score of 8.8 (High), impacting confidentiality, integrity, and availability of the affected systems. It requires user interaction to trigger, either by opening a malicious PDF file or visiting a malicious site with the browser extension enabled.
Technical Details of CVE-2021-21831
Explore the specific technical aspects of the vulnerability to understand its implications.
Vulnerability Description
CVE-2021-21831 arises from a use-after-free flaw in the JavaScript engine of Foxit Reader 10.1.3.37598. By exploiting this issue, an attacker can execute arbitrary code by triggering the reuse of freed memory.
Affected Systems and Versions
The vulnerability impacts Foxit Reader version 10.1.3.37598, specifically exposing users of this software to the risk of arbitrary code execution.
Exploitation Mechanism
Exploitation occurs when a specially crafted PDF file is opened or when a user navigates to a malicious website with the browser plugin extension activated, allowing an attacker to execute arbitrary code.
Mitigation and Prevention
Discover the steps recommended to mitigate the risks associated with CVE-2021-21831 and safeguard systems from potential exploitation.
Immediate Steps to Take
Users should exercise caution when opening PDF files from untrusted sources and disable browser plugins or extensions that are not necessary to reduce the attack surface.
Long-Term Security Practices
Regularly update Foxit Reader to the latest version to patch known vulnerabilities and enhance security measures. Employing security software that detects and blocks potentially malicious PDF files can also help prevent exploitation of these types of vulnerabilities.
Patching and Updates
Foxit Software may release security patches to address CVE-2021-21831. It is crucial to apply these patches promptly to mitigate the risk of exploitation and protect systems from potential attacks.