CVE-2021-34839 : Exploit Details and Defense Strategies

This CVE-2021-34839 article provides insights into a critical vulnerability found in Foxit PDF Reader version 11.0.0.49893, allowing remote attackers to execute arbitrary code with high impact. The article explores the vulnerability, its impact, and mitigation strategies.

Understanding CVE-2021-34839

This section delves into the details of the CVE-2021-34839 vulnerability found in Foxit PDF Reader version 11.0.0.49893.

What is CVE-2021-34839?

CVE-2021-34839 is a vulnerability in Foxit PDF Reader 11.0.0.49893 that enables remote attackers to execute arbitrary code. The flaw occurs due to the mishandling of Annotation objects, allowing malicious actors to exploit this vulnerability.

The Impact of CVE-2021-34839

The vulnerability poses a high impact, with a CVSS base score of 7.8. Attackers can exploit this flaw to execute code in the context of the current process, requiring user interaction through visiting a malicious website or opening a tainted file.

Technical Details of CVE-2021-34839

This section outlines the technical aspects of CVE-2021-34839, including the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

CVE-2021-34839 is classified as CWE-416: Use After Free. The flaw arises from the lack of object validation before executing operations, leading to the execution of arbitrary code by malicious actors.

Affected Systems and Versions

Foxit PDF Reader version 11.0.0.49893 is affected by CVE-2021-34839, exposing installations of this version to remote code execution attacks.

Exploitation Mechanism

To exploit CVE-2021-34839, attackers need to induce user interaction by luring victims to access a malicious webpage or open a corrupted file that triggers the vulnerability.

Mitigation and Prevention

This section offers guidance on mitigating the risks associated with CVE-2021-34839 and preventive measures to enhance system security.

Immediate Steps to Take

Users are advised to update Foxit PDF Reader to a secure version, avoid interacting with suspicious links or files, and exercise caution while browsing.

Long-Term Security Practices

Establishing robust security protocols, conducting regular security audits, and educating users on safe browsing habits are crucial for long-term security.

Patching and Updates

Regularly check for security updates from Foxit, apply patches promptly, and stay informed about security advisories to counter emerging threats.