CVE-2023-42038
📋 TL;DR
A heap-based buffer overflow vulnerability in Kofax Power PDF allows remote attackers to execute arbitrary code when users open malicious PDF files. This affects all users of vulnerable versions of Kofax Power PDF software. Successful exploitation requires user interaction through opening a malicious file or visiting a malicious webpage.
💻 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, ransomware deployment, and lateral movement within the network.
Likely Case
Local privilege escalation leading to data exfiltration, installation of persistent malware, or use as initial access point for broader network attacks.
If Mitigated
Application crash or denial of service if exploit fails, with potential for limited data leakage from memory corruption.
🎯 Exploit Status
Exploitation requires user interaction but no authentication. The vulnerability is in PDF parsing which is a common attack vector with known exploitation patterns.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.0.0.4 and later
Vendor Advisory: https://docshield.kofax.com/PowerPDF/en_US/5.0.0.4/wwhelp/wwhimpl/js/html/wwhelp.htm#href=ReleaseNotes.05.00.html
Restart Required: Yes
Instructions:
1. Download the latest version from Kofax official website
2. Run the installer as administrator
3. Follow installation prompts
4. Restart the system after installation completes
🔧 Temporary Workarounds
Disable PDF file association
windowsPrevent Power PDF from automatically opening PDF files by changing default file associations
Control Panel > Default Programs > Set Default Programs > Choose another program for PDF files
Application Control Policy
windowsBlock execution of Power PDF using application whitelisting or endpoint protection
🧯 If You Can't Patch
- Implement network segmentation to isolate systems running Power PDF
- Deploy endpoint detection and response (EDR) with memory protection capabilities
- Educate users about the risks of opening untrusted PDF files
- Monitor for suspicious PDF file access and process creation events
🔍 How to Verify
Check if Vulnerable:
Check Power PDF version in Help > About. If version is earlier than 5.0.0.4, the system is vulnerable.Check Version:
wmic product where "name like 'Kofax Power PDF%'" get versionVerify Fix Applied:
Verify Power PDF version is 5.0.0.4 or later in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Power PDF process crashes with memory access violations
- Unusual child processes spawned from Power PDF
- Multiple failed PDF parsing attempts
Network Indicators:
- Downloads of PDF files from suspicious sources
- Outbound connections from Power PDF process to unknown IPs
SIEM Query:
process_name:"PowerPDF.exe" AND (event_id:1000 OR event_id:1001) OR process_parent_name:"PowerPDF.exe" AND process_name NOT IN ("explorer.exe", "svchost.exe")