CVE-2024-30361
📋 TL;DR
A use-after-free vulnerability in Foxit PDF Reader's AcroForm handling allows remote attackers to execute arbitrary code when a user opens a malicious PDF file or visits a malicious webpage. This affects users of vulnerable Foxit PDF Reader versions, potentially leading to complete system compromise.
💻 Affected Systems
- Foxit PDF Reader
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining the same privileges as the current user, potentially leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Malware installation, credential theft, or data exfiltration from the compromised system.
If Mitigated
Limited impact if application runs with minimal privileges, sandboxed, or network segmentation prevents lateral movement.
🎯 Exploit Status
Exploitation requires user interaction but no authentication. Use-after-free vulnerabilities are commonly weaponized in PDF reader attacks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Foxit security bulletins for specific patched version
Vendor Advisory: https://www.foxit.com/support/security-bulletins.html
Restart Required: Yes
Instructions:
1. Visit Foxit security bulletins page
2. Identify latest patched version for your product
3. Download and install update
4. Restart system
🔧 Temporary Workarounds
Disable JavaScript in PDF Reader
allPrevents JavaScript-based exploitation vectors in PDF files
In Foxit Reader: Edit > Preferences > JavaScript > Uncheck 'Enable JavaScript'
Use Protected View
allOpen PDFs in sandboxed protected view mode
In Foxit Reader: File > Preferences > Trust Manager > Enable 'Safe Reading Mode'
🧯 If You Can't Patch
- Restrict PDF file handling to alternative PDF readers without this vulnerability
- Implement application whitelisting to block Foxit Reader execution
🔍 How to Verify
Check if Vulnerable:
Check Foxit Reader version against vulnerable versions listed in Foxit security bulletinsCheck Version:
In Foxit Reader: Help > About Foxit ReaderVerify Fix Applied:
Verify installed version matches or exceeds patched version from Foxit advisory📡 Detection & Monitoring
Log Indicators:
- Unexpected Foxit Reader crashes
- Suspicious child processes spawned from Foxit Reader
- Unusual network connections from Foxit Reader process
Network Indicators:
- Outbound connections to suspicious domains/IPs from PDF reader process
- Unusual DNS queries following PDF file opening
SIEM Query:
process_name:"FoxitReader.exe" AND (event_id:1 OR parent_process_name:"FoxitReader.exe")