CVE-2024-30334
📋 TL;DR
This is a use-after-free vulnerability in Foxit PDF Reader's handling of Doc objects that allows remote attackers to execute arbitrary code when users open malicious PDF files or visit malicious web pages. It affects Foxit PDF Reader installations where users interact with untrusted PDF content.
💻 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 current user, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Malware installation or data exfiltration from the compromised system, with attackers leveraging the foothold for further exploitation.
If Mitigated
Limited impact if systems are patched, users have limited privileges, and security controls prevent execution of malicious payloads.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file), but the vulnerability itself can be triggered without authentication. ZDI has confirmed the vulnerability exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Foxit security bulletins for specific patched versions
Vendor Advisory: https://www.foxit.com/support/security-bulletins.html
Restart Required: Yes
Instructions:
1. Visit Foxit's security bulletins page
2. Identify the latest version that addresses CVE-2024-30334
3. Download and install the updated version
4. Restart the system to ensure complete patch application
🔧 Temporary Workarounds
Disable JavaScript in Foxit PDF Reader
allPrevents exploitation vectors that rely on JavaScript execution within PDF files
Open Foxit PDF Reader > File > Preferences > Security > Uncheck 'Enable JavaScript'
Use Protected View
allOpen PDF files in protected/sandboxed mode to limit potential damage
Ensure 'Protected View' is enabled in Foxit security settings
🧯 If You Can't Patch
- Restrict user privileges to prevent system-wide compromise if exploited
- Implement application whitelisting to block unauthorized executables
🔍 How to Verify
Check if Vulnerable:
Check Foxit PDF Reader version against patched versions listed in Foxit security bulletinsCheck Version:
Open Foxit PDF Reader > Help > About Foxit ReaderVerify Fix Applied:
Verify installed version is equal to or greater than the patched version specified in Foxit's advisory📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from Foxit Reader
- Memory access violations or crash reports from Foxit processes
- Unexpected network connections originating from Foxit Reader
Network Indicators:
- Outbound connections to suspicious IPs/domains following PDF file opening
- DNS requests for known malicious domains after PDF interaction
SIEM Query:
Process creation where parent_process contains 'foxit' AND (process contains 'cmd.exe' OR process contains 'powershell.exe' OR process contains suspicious executable names)