CVE-2023-39485 – This vulnerability allows remote attackers to e... (How to Fix)

Q: What is the severity of CVE-2023-39485?

CVE-2023-39485 has a CVSS score of 7.8 (HIGH). This vulnerability allows remote attackers to execute arbitrary code on systems running vulnerable versions of PDF-XChange Editor by tricking users into opening malicious JP2 files. The flaw exists in how the software handles JP2 file parsing, enabling buffer overflow attacks. Users of PDF-XChange Editor who open untrusted JP2 files are at risk.

📋 TL;DR

This vulnerability allows remote attackers to execute arbitrary code on systems running vulnerable versions of PDF-XChange Editor by tricking users into opening malicious JP2 files. The flaw exists in how the software handles JP2 file parsing, enabling buffer overflow attacks. Users of PDF-XChange Editor who open untrusted JP2 files are at risk.

💻 Affected Systems

Products:

PDF-XChange Editor

Versions: Versions prior to 10.1.1.380

Operating Systems: Windows

Default Config Vulnerable: ⚠️ Yes

Notes: All default installations are vulnerable. User interaction required (opening malicious file).

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete system compromise with attacker gaining full control of the affected system, data theft, ransomware deployment, and lateral movement within the network.

🟠

Likely Case

Local privilege escalation leading to data exfiltration, malware installation, or system disruption for the affected user account.

🟢

If Mitigated

Limited impact with proper application sandboxing and user privilege restrictions, potentially resulting in application crash only.

🌐 Internet-Facing: MEDIUM

🏢 Internal Only: HIGH

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires user interaction but is technically straightforward once malicious file is opened. ZDI has confirmed the vulnerability.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 10.1.1.380 and later

Vendor Advisory: https://www.tracker-software.com/support/security-bulletins.html

Restart Required: Yes

Instructions:

1. Download latest version from official PDF-XChange website
2. Run installer with administrative privileges
3. Restart system after installation completes

🔧 Temporary Workarounds

Disable JP2 file association

windows

Remove JP2 file type association with PDF-XChange Editor to prevent automatic opening

Control Panel > Default Programs > Associate a file type or protocol with a program > Change .jp2 association to different application

Application sandboxing

windows

Run PDF-XChange Editor in restricted environment

🧯 If You Can't Patch

Implement application whitelisting to block PDF-XChange Editor execution
Deploy network segmentation to isolate affected systems

🔍 How to Verify

Check if Vulnerable:

Check Help > About in PDF-XChange Editor for version number

Check Version:

Not applicable - check via GUI in Help > About

Verify Fix Applied:

Verify version is 10.1.1.380 or higher in Help > About

📡 Detection & Monitoring

Log Indicators:

Application crashes from PDF-XChange Editor
Unusual process creation from PDF-XChange Editor
Failed file parsing attempts

Network Indicators:

Downloads of JP2 files followed by PDF-XChange Editor execution

SIEM Query:

Process Creation where Image contains 'PDFXEdit.exe' AND Parent Process contains 'explorer.exe'

📊 Metadata

CVE ID: CVE-2023-39485

CVSS v3 Score: 7.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE: CWE-787

Published: May 3, 2024

Last Updated: May 20, 2025

🔗 References

https://www.zerodayinitiative.com/advisories/ZDI-23-1124/ Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-23-1124/ Third Party Advisory

📤 Share & Export

📄 Export Markdown 📋 Export JSON

🔗 Related Vulnerabilities

If you're affected by CVE-2023-39485, you might also want to check these: