CVE-2023-51597
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code by tricking users into opening malicious U3D files in Kofax Power PDF. Attackers can exploit improper buffer validation during U3D file parsing to write beyond allocated memory boundaries and gain code execution. All users of affected Kofax Power PDF versions are at risk.
💻 Affected Systems
- Kofax Power PDF
📦 What is this software?
Power Pdf by Tungstenautomation
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining the same privileges as the PDF application user, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Local privilege escalation leading to malware installation, data exfiltration, or persistence mechanisms being established on the compromised system.
If Mitigated
Application crash or denial of service if exploit attempts are blocked by security controls, with no code execution achieved.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file) but no authentication. The vulnerability is in a file parsing component commonly targeted by attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Kofax security advisory for specific patched version
Vendor Advisory: https://docshield.kofax.com/PowerPDF/en_US/5.5.0-d3ps28gq5z/print/ReadMe.htm
Restart Required: Yes
Instructions:
1. Open Kofax Power PDF
2. Navigate to Help > Check for Updates
3. Follow prompts to download and install latest version
4. Restart the application and system if prompted
🔧 Temporary Workarounds
Disable U3D file handling
windowsRemove or modify file associations to prevent Power PDF from automatically opening U3D files
Control Panel > Default Programs > Associate a file type or protocol with a program
Find .u3d extension and change association to Notepad or another safe viewer
Application control policy
windowsUse Windows Defender Application Control or similar to restrict Power PDF from executing code
🧯 If You Can't Patch
- Implement strict email filtering to block U3D attachments
- Deploy endpoint detection and response (EDR) to monitor for suspicious PDF process behavior
🔍 How to Verify
Check if Vulnerable:
Check Power PDF version against Kofax security advisory. Vulnerable if using version prior to patched release.Check Version:
In Power PDF: Help > About Power PDFVerify Fix Applied:
Verify Power PDF version matches or exceeds patched version listed in Kofax advisory. Test with known safe U3D files to ensure proper parsing.📡 Detection & Monitoring
Log Indicators:
- Power PDF process crashes with memory access violations
- U3D file processing errors in application logs
- Unusual child processes spawned from Power PDF
Network Indicators:
- Power PDF making unexpected outbound connections after file open
- DNS requests to suspicious domains following U3D file processing
SIEM Query:
Process Creation where (Image contains 'powerpdf' OR ParentImage contains 'powerpdf') AND CommandLine contains '.u3d'