CVE-2018-3993 : Security Advisory and Response

Foxit Software's Foxit PDF Reader version 9.2.0.9297 contains a use-after-free vulnerability in its JavaScript engine that could lead to remote code execution when a specially crafted PDF document is opened.

Understanding CVE-2018-3993

This CVE entry describes a critical vulnerability in Foxit PDF Reader that allows attackers to execute arbitrary code by exploiting a use-after-free issue in the software's JavaScript engine.

What is CVE-2018-3993?

The vulnerability in Foxit PDF Reader version 9.2.0.9297 enables attackers to reuse a freed object in memory, leading to arbitrary code execution.
To trigger this vulnerability, a user must open a maliciously crafted PDF document.
Activation of the vulnerability can also occur if the browser plugin extension is enabled and the user visits a malicious website.

The Impact of CVE-2018-3993

CVSS Base Score: 8 (High)
Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: Required
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High
Scope: Unchanged
This vulnerability poses a significant risk as it allows remote code execution with high severity.

Technical Details of CVE-2018-3993

Foxit PDF Reader version 9.2.0.9297 is susceptible to remote code execution due to a use-after-free vulnerability in its JavaScript engine.

Vulnerability Description

The vulnerability allows a previously freed object in memory to be triggered for arbitrary code execution.

Affected Systems and Versions

Affected Product: Foxit PDF Reader
Vendor: Foxit Software
Affected Version: 9.2.0.9297

Exploitation Mechanism

Attackers can exploit this vulnerability by tricking users into opening a specially crafted PDF document or by directing them to a malicious website if the browser plugin extension is active.

Mitigation and Prevention

It is crucial to take immediate steps to mitigate the risks posed by CVE-2018-3993.

Immediate Steps to Take

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

Long-Term Security Practices

Educate users on safe browsing habits and the risks associated with opening unknown files.
Implement network security measures to detect and prevent malicious PDF files from being accessed.

Patching and Updates

Apply security patches provided by Foxit Software promptly to address the vulnerability and enhance the software's security.