CVE-2019-20824 : Exploit Details and Defense Strategies

Foxit PhantomPDF prior to 8.3.11 is affected by a NULL pointer dereference vulnerability when processing Epub files.

Understanding CVE-2019-20824

This CVE identifies a specific security issue in Foxit PhantomPDF versions before 8.3.11.

What is CVE-2019-20824?

The vulnerability in Foxit PhantomPDF is due to a NULL pointer dereference triggered by the FXSYS_wcslen function when handling Epub files.

The Impact of CVE-2019-20824

The vulnerability could potentially lead to a denial of service (DoS) condition or arbitrary code execution by an attacker exploiting the issue.

Technical Details of CVE-2019-20824

Foxit PhantomPDF vulnerability details and affected systems.

Vulnerability Description

A NULL pointer dereference occurs in Foxit PhantomPDF versions prior to 8.3.11 when processing Epub files, specifically in the FXSYS_wcslen function.

Affected Systems and Versions

Product: Foxit PhantomPDF
Versions affected: Prior to 8.3.11

Exploitation Mechanism

The vulnerability can be exploited by crafting a malicious Epub file to trigger the NULL pointer dereference, potentially leading to DoS or code execution.

Mitigation and Prevention

Steps to mitigate and prevent exploitation of CVE-2019-20824.

Immediate Steps to Take

Update Foxit PhantomPDF to version 8.3.11 or later to patch the vulnerability.
Avoid opening Epub files from untrusted or unknown sources.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Implement network security measures to detect and block malicious Epub files.

Patching and Updates

Ensure timely installation of software updates and security patches to protect against known vulnerabilities.