CVE-2020-10897
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code by tricking users into opening malicious PDF files containing specially crafted U3D objects. It affects Foxit PhantomPDF users running version 9.7.1.29511, enabling attackers to gain control of the victim's system through a memory corruption flaw.
💻 Affected Systems
- Foxit PhantomPDF
📦 What is this software?
Phantompdf by Foxitsoftware
Reader by Foxitsoftware
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the victim's machine, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Local privilege escalation leading to data exfiltration, installation of persistent malware, or credential harvesting from the compromised system.
If Mitigated
Limited impact with proper application sandboxing and memory protection mechanisms preventing successful exploitation.
🎯 Exploit Status
Exploitation requires social engineering to deliver malicious PDF but no authentication needed once file is opened.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.7.2 or later
Vendor Advisory: https://www.foxitsoftware.com/support/security-bulletins.php
Restart Required: Yes
Instructions:
1. Download latest version from Foxit website. 2. Run installer. 3. Restart system. 4. Verify version is 9.7.2 or higher.
🔧 Temporary Workarounds
Disable U3D object processing
windowsConfigure Foxit PhantomPDF to disable U3D object rendering in PDF files
Edit registry: HKEY_CURRENT_USER\Software\Foxit Software\PhantomPDF\Preferences\Security\EnableU3D = 0
Use alternative PDF viewer
allTemporarily use a different PDF reader that is not vulnerable
🧯 If You Can't Patch
- Implement application whitelisting to block execution of Foxit PhantomPDF
- Deploy email/web filtering to block PDF files and implement user awareness training about opening suspicious attachments
🔍 How to Verify
Check if Vulnerable:
Check Help > About in Foxit PhantomPDF for version number. If version is 9.7.1.29511, system is vulnerable.Check Version:
wmic product where name="Foxit PhantomPDF" get versionVerify Fix Applied:
Verify version is 9.7.2 or higher in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Application crashes of Foxit PhantomPDF
- Unusual process creation from Foxit processes
- Memory access violation events in Windows Event Logs
Network Indicators:
- Outbound connections from Foxit processes to unknown IPs
- DNS requests for suspicious domains following PDF file opening
SIEM Query:
source="Windows Security" EventCode=4688 NewProcessName="*foxit*" | stats count by host