CVE-2019-17139 : Exploit Details and Defense Strategies

Remote attackers can exploit a vulnerability in Foxit PhantomPDF 9.5.0.20723 to execute arbitrary code by visiting a malicious page or opening a malicious file. The flaw originates from the way Javascript is processed in the HTML2PDF plugin, allowing for code execution within the current process.

Understanding CVE-2019-17139

This CVE involves a high-severity vulnerability in Foxit PhantomPDF 9.5.0.20723 that can be exploited by remote attackers.

What is CVE-2019-17139?

The vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PhantomPDF 9.5.0.20723.
User interaction is required, where the target must visit a malicious page or open a malicious file.
The issue lies in the processing of Javascript in the HTML2PDF plugin, due to insufficient validation of user-supplied data.

The Impact of CVE-2019-17139

CVSS Score: 7.8 (High)
Attack Vector: Local
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Confidentiality, Integrity, and Availability Impact: High

Technical Details of CVE-2019-17139

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

Vulnerability Description

Identified as ZDI-CAN-8692
Type: Out-of-bounds Write (CWE-787)
Allows for code execution within the current process

Affected Systems and Versions

Product: Foxit PhantomPDF
Vendor: Foxit
Version: 9.5.0.20723

Exploitation Mechanism

Attackers can exploit the vulnerability by manipulating Javascript in the HTML2PDF plugin.
Insufficient validation of user-supplied data leads to a write beyond the allocated object.

Mitigation and Prevention

Protecting systems from CVE-2019-17139 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Foxit PhantomPDF to a patched version.
Avoid visiting suspicious or untrusted websites.
Be cautious when opening files from unknown sources.

Long-Term Security Practices

Regularly update software and security patches.
Implement robust cybersecurity measures to prevent code execution vulnerabilities.

Patching and Updates

Foxit may release patches to address the vulnerability.
Stay informed about security bulletins and advisories from Foxit and security organizations.