CVE-2020-10902
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Foxit PhantomPDF installations by tricking users into opening malicious PDF files containing specially crafted U3D objects. The flaw exists due to improper validation of user-supplied data, leading to out-of-bounds memory reads that can be leveraged for code execution. All users of affected Foxit PhantomPDF versions are at risk.
💻 Affected Systems
- Foxit PhantomPDF
📦 What is this software?
Phantompdf by Foxitsoftware
Reader by Foxitsoftware
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through remote code execution with user privileges, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Malicious actors deliver weaponized PDFs via phishing campaigns to execute malware or establish footholds in target environments.
If Mitigated
Limited impact with proper application sandboxing, memory protection mechanisms, and user awareness preventing malicious file execution.
🎯 Exploit Status
Exploitation requires user interaction but no authentication. Weaponization likely due to PDF-based attack vectors being common in phishing campaigns.
🛠️ 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 support
windowsDisable U3D object processing in Foxit PhantomPDF settings
Navigate to Edit > Preferences > Security (Enhanced) > Disable U3D support
Use alternative PDF viewer
allTemporarily use different PDF software until patched
🧯 If You Can't Patch
- Implement application whitelisting to block unauthorized PDF execution
- Deploy email filtering to block PDF attachments and use network segmentation
🔍 How to Verify
Check if Vulnerable:
Check Foxit PhantomPDF version in Help > About. If version is 9.7.1.29511 or earlier, system is vulnerable.Check Version:
In Foxit PhantomPDF: Help > AboutVerify Fix Applied:
Verify version is 9.7.2 or higher in Help > About. Test opening known safe PDF files with U3D content.📡 Detection & Monitoring
Log Indicators:
- Application crashes in Foxit PhantomPDF
- Unexpected process creation from Foxit processes
- Memory access violation errors in application logs
Network Indicators:
- PDF file downloads from suspicious sources
- Outbound connections from Foxit processes to unknown IPs
SIEM Query:
source="*foxit*" AND (event_type="crash" OR process_name="*foxit*")