CVE-2023-51606
📋 TL;DR
This vulnerability in Kofax Power PDF allows remote attackers to execute arbitrary code by tricking users into opening malicious U3D files. The flaw exists in U3D file parsing where improper data validation leads to out-of-bounds reads. Users of affected Kofax Power PDF versions are at risk when processing untrusted U3D files.
💻 Affected Systems
- Kofax Power PDF
📦 What is this software?
Power Pdf by Tungstenautomation
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining the same privileges as the PDF application user, potentially leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Remote code execution in the context of the PDF application, allowing file system access, credential harvesting, and malware installation.
If Mitigated
Limited impact with application sandboxing or restricted user privileges, potentially resulting in application crash or denial of service.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file) and knowledge of U3D file format manipulation; no public exploit code identified in provided references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Kofax security advisory for specific patched version
Vendor Advisory: https://docshield.kofax.com/PowerPDF/en_US/4.0.0-4n1h8d3v3y/print/ReadMe.htm
Restart Required: Yes
Instructions:
1. Check current Power PDF version
2. Visit Kofax support portal for latest security updates
3. Download and install the security patch
4. Restart system to complete installation
🔧 Temporary Workarounds
Disable U3D file processing
windowsConfigure Power PDF to block or not process U3D file format
Check Power PDF security settings for file type restrictions
Use application sandboxing
windowsRun Power PDF in restricted environment with limited privileges
Configure Windows Sandbox or similar isolation technology
🧯 If You Can't Patch
- Implement strict email filtering to block U3D attachments
- Educate users to never open U3D files from untrusted sources
🔍 How to Verify
Check if Vulnerable:
Check Power PDF version against vendor's patched version list; if using unpatched version and U3D processing is enabled, system is vulnerable.Check Version:
In Power PDF: Help → About Power PDFVerify Fix Applied:
Verify Power PDF version matches or exceeds patched version from vendor advisory; test with known safe U3D files to ensure functionality.📡 Detection & Monitoring
Log Indicators:
- Power PDF crash logs with memory access violations
- Unexpected process creation from Power PDF executable
- File access to suspicious U3D files
Network Indicators:
- Downloads of U3D files from untrusted sources
- Outbound connections initiated by Power PDF process
SIEM Query:
Process Creation where Image contains 'PowerPDF' AND ParentImage contains 'explorer.exe' AND CommandLine contains '.u3d'