CVE-2018-3943 : Security Advisory and Response

A vulnerability has been discovered in Foxit Software's PDF Reader, version 9.1.0.5096, allowing for remote code execution through its JavaScript engine.

Understanding CVE-2018-3943

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

What is CVE-2018-3943?

The vulnerability in Foxit PDF Reader version 9.1.0.5096 enables attackers to execute arbitrary code by exploiting the JavaScript engine.
Attackers can trigger this vulnerability by deceiving users into opening a specially crafted PDF document.
Activation of the browser plugin extension could also expose users to this vulnerability.

The Impact of CVE-2018-3943

CVSS Base Score: 8 (High)
Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: Required
Confidentiality, Integrity, and Availability Impact: High
This vulnerability poses a significant risk as it allows attackers to execute malicious code on affected systems.

Technical Details of CVE-2018-3943

This section provides detailed technical information about the vulnerability.

Vulnerability Description

An exploitable use-after-free vulnerability exists in the JavaScript engine of Foxit Software's PDF Reader, version 9.1.0.5096.
A specially crafted PDF document can trigger the reuse of a previously freed object in memory, leading to arbitrary code execution.

Affected Systems and Versions

Affected Product: Foxit PDF Reader
Vendor: Foxit
Affected Version: Foxit Software PDF Reader 9.1.0.5096

Exploitation Mechanism

Attackers exploit this vulnerability by tricking users into opening malicious PDF files.
Activation of the browser plugin extension can also trigger the vulnerability when visiting malicious websites.

Mitigation and Prevention

Protecting systems from CVE-2018-3943 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Foxit PDF Reader to the latest version to patch the vulnerability.
Avoid opening PDF files from untrusted or unknown sources.
Disable the browser plugin extension if not essential for daily operations.

Long-Term Security Practices

Educate users about the risks associated with opening unknown or suspicious PDF files.
Implement robust email and web filtering to block malicious PDF attachments and links.

Patching and Updates

Regularly check for updates and security patches for Foxit PDF Reader to address known vulnerabilities.