CVE-2018-16293 : Security Advisory and Response

A use-after-free vulnerability in Foxit Reader and PhantomPDF versions prior to 9.3 allows attackers to execute arbitrary code by manipulating a PDF document. The vulnerability requires user interaction to open a malicious file.

Understanding CVE-2018-16293

This CVE involves a specific flaw in the JavaScript engine of Foxit Reader and PhantomPDF versions before 9.3.

What is CVE-2018-16293?

The vulnerability is distinct from several other CVEs and involves a use-after-free flaw in the JavaScript engine.
Attackers can exploit this flaw by tricking users into opening a manipulated PDF document.
If the browser plugin extension is active, visiting a malicious website can also trigger the vulnerability.

The Impact of CVE-2018-16293

Exploiting this vulnerability allows attackers to execute arbitrary code on the targeted system.
Successful exploitation requires user interaction to open a malicious PDF file.

Technical Details of CVE-2018-16293

This section provides more in-depth technical details about the vulnerability.

Vulnerability Description

An exploitable use-after-free vulnerability exists in the JavaScript engine of Foxit Reader and PhantomPDF before version 9.3.
A specially crafted PDF document can trigger the reuse of a freed object in memory, leading to arbitrary code execution.

Affected Systems and Versions

Foxit Reader versions prior to 9.3
PhantomPDF versions prior to 9.3

Exploitation Mechanism

Attackers manipulate PDF documents to exploit a previously deleted object in the computer's memory.
The vulnerability requires the user to open the malicious file for the exploit to occur.
Active browser plugin extensions can also be used to trigger the vulnerability.

Mitigation and Prevention

Protecting systems from CVE-2018-16293 involves immediate steps and long-term security practices.

Immediate Steps to Take

Update Foxit Reader and PhantomPDF to version 9.3 or later.
Avoid opening PDF files from untrusted or unknown sources.
Disable browser plugin extensions if not necessary.

Long-Term Security Practices

Regularly update software and applications to patch known vulnerabilities.
Educate users about the risks of opening files from unfamiliar sources.

Patching and Updates

Ensure that all software, including Foxit Reader and PhantomPDF, is regularly updated with the latest security patches.