CVE-2018-3958 : Security Advisory and Response

A security flaw in Foxit PDF Reader version 9.1.0.5096 allows remote code execution through a use-after-free vulnerability in the JavaScript engine.

Understanding CVE-2018-3958

This CVE involves a critical vulnerability in Foxit Software's Foxit PDF Reader version 9.1.0.5096, potentially leading to remote code execution.

What is CVE-2018-3958?

The vulnerability is a use-after-free flaw in the JavaScript engine of Foxit PDF Reader.
It arises when attempting to access the Subject property of the this.info object.
Exploitation requires tricking users into opening a corrupted file or visiting a malicious website with an active browser plugin extension.

The Impact of CVE-2018-3958

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

Technical Details of CVE-2018-3958

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability allows an attacker to execute remote code by exploiting the use-after-free condition in the JavaScript engine.

Affected Systems and Versions

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

Exploitation Mechanism

Attackers can trigger the vulnerability by deceiving users into opening a corrupted file or by directing them to a malicious website with an active browser plugin extension.

Mitigation and Prevention

Protecting systems from CVE-2018-3958 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable the browser plugin extension if not essential for daily operations.
Exercise caution when opening PDF files from untrusted sources.
Regularly update Foxit PDF Reader to the latest version.

Long-Term Security Practices

Implement security awareness training to educate users on phishing tactics.
Employ network segmentation to limit the impact of potential attacks.

Patching and Updates

Stay informed about security updates from Foxit and apply patches promptly to mitigate the vulnerability.