CVE-2018-3939 : Exploit Details and Defense Strategies

A vulnerability exists in Foxit Software's PDF Reader, version 9.1.0.5096, allowing remote code execution through a use-after-free issue in the JavaScript engine.

Understanding CVE-2018-3939

This CVE involves a critical vulnerability in Foxit PDF Reader that could lead to arbitrary code execution.

What is CVE-2018-3939?

The vulnerability in Foxit PDF Reader, version 9.1.0.5096, stems from a use-after-free flaw in the JavaScript engine. Attackers can exploit this by crafting a specific PDF document to execute malicious code.

The Impact of CVE-2018-3939

CVSS Base Score: 8 (High Severity)
Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: Required
Confidentiality, Integrity, and Availability Impact: High

Technical Details of CVE-2018-3939

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The vulnerability allows attackers to execute arbitrary code by reusing a previously freed object in the system's memory.

Affected Systems and Versions

Product: Foxit PDF Reader
Vendor: Foxit
Version: 9.1.0.5096

Exploitation Mechanism

To exploit this vulnerability, attackers need to deceive users into opening a malicious PDF file or trigger it by visiting a malicious website if the browser plugin extension is enabled.

Mitigation and Prevention

Protecting systems from CVE-2018-3939 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable the browser plugin extension if not essential
Avoid opening PDF files from untrusted or unknown sources
Implement security awareness training to recognize phishing attempts

Long-Term Security Practices

Regularly update Foxit PDF Reader to the latest version
Employ endpoint protection solutions to detect and prevent malicious activities

Patching and Updates

Ensure timely installation of security patches and updates provided by Foxit to address the vulnerability.