CVE-2023-38107
📋 TL;DR
This is a use-after-free vulnerability in Foxit PDF Reader's annotation handling that allows remote attackers to execute arbitrary code when a user opens a malicious PDF file. Attackers can gain control of the current process, potentially leading to full system compromise. All users of affected Foxit PDF Reader versions are at risk.
💻 Affected Systems
- Foxit PDF Reader
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining the same privileges as the user running Foxit PDF Reader, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Malicious actor executes code with user privileges, potentially installing malware, stealing sensitive documents, or establishing persistence on the system.
If Mitigated
If proper controls like application sandboxing, least privilege, and network segmentation are in place, impact may be limited to the user's session without lateral movement.
🎯 Exploit Status
User interaction required (opening malicious PDF). The vulnerability is well-documented and was disclosed through ZDI, making weaponization likely.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 12.1.3 and later
Vendor Advisory: https://www.foxit.com/support/security-bulletins.html
Restart Required: Yes
Instructions:
1. Download Foxit PDF Reader 12.1.3 or later from official Foxit website. 2. Run the installer. 3. Follow installation prompts. 4. Restart system if prompted.
🔧 Temporary Workarounds
Disable JavaScript in Foxit PDF Reader
windowsDisabling JavaScript may prevent exploitation as many PDF-based attacks rely on JavaScript execution.
Open Foxit PDF Reader > File > Preferences > JavaScript > Uncheck 'Enable JavaScript'
Use alternative PDF reader
allTemporarily use a different PDF reader that is not affected by this vulnerability.
🧯 If You Can't Patch
- Implement application whitelisting to block execution of unauthorized PDF files
- Deploy network segmentation to limit lateral movement if exploitation occurs
🔍 How to Verify
Check if Vulnerable:
Check Foxit PDF Reader version: Open Foxit > Help > About Foxit Reader. If version is below 12.1.3, you are vulnerable.Check Version:
wmic product where name="Foxit Reader" get versionVerify Fix Applied:
Verify version is 12.1.3 or higher in Help > About Foxit Reader.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from Foxit Reader
- Multiple failed annotation operations in application logs
- Unexpected network connections from Foxit process
Network Indicators:
- Outbound connections from Foxit Reader to unknown IPs
- DNS requests for suspicious domains from Foxit process
SIEM Query:
process_name:"FoxitReader.exe" AND (process_parent:!="explorer.exe" OR network_connection:*)