CVE-2023-42127
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code by tricking users into opening malicious PDF files in Kofax Power PDF. The flaw exists in PDF parsing where improper data validation enables out-of-bounds writes. 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 full control of the affected system, data theft, and lateral movement within the network.
Likely Case
Malware installation, data exfiltration, or ransomware deployment on individual user systems through malicious PDF documents.
If Mitigated
Limited impact with proper application sandboxing and user privilege restrictions, potentially resulting in application crash only.
🎯 Exploit Status
Exploitation requires user interaction but is technically straightforward once malicious PDF is opened. No authentication required for the exploit itself.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Latest version available from Kofax (check vendor advisory for specific version)
Vendor Advisory: https://docshield.kofax.com/PowerPDF/en_US/5.5.0-d3ps5g6v25/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 system after installation
🔧 Temporary Workarounds
Disable PDF file association
windowsPrevent Power PDF from automatically opening PDF files
Control Panel > Default Programs > Set Associations > Find .pdf > Change to alternative PDF reader
Application sandboxing
windowsRun Power PDF in restricted environment
🧯 If You Can't Patch
- Implement application whitelisting to block Power PDF execution
- Deploy network filtering to block PDF downloads from untrusted sources
🔍 How to Verify
Check if Vulnerable:
Check Power PDF version against vendor advisory. Vulnerable if using version prior to patched release.Check Version:
Open Power PDF > Help > About Power PDFVerify Fix Applied:
Verify Power PDF version matches or exceeds patched version specified in vendor advisory.📡 Detection & Monitoring
Log Indicators:
- Application crashes of Power PDF
- Unusual process creation from Power PDF executable
- Memory access violation errors in application logs
Network Indicators:
- PDF downloads from suspicious sources
- Unusual outbound connections from Power PDF process
SIEM Query:
Process Creation where Image contains 'PowerPDF' AND ParentImage contains 'explorer.exe' AND CommandLine contains '.pdf'