CVE-2024-30351
📋 TL;DR
This is a use-after-free vulnerability in Foxit PDF Reader's AcroForm handling that allows remote attackers to execute arbitrary code when a user opens a malicious PDF file. Attackers can exploit this to run code with the same privileges as the PDF Reader process. All users running vulnerable versions of Foxit PDF Reader are affected.
💻 Affected Systems
- Foxit PDF Reader
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via remote code execution leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Malware installation, credential theft, or lateral movement within the network from the compromised user's context.
If Mitigated
Limited impact due to sandboxing or application hardening, potentially only application crash or denial of service.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious PDF). The vulnerability is in a widely used component (AcroForms) making exploitation likely once details become public.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Foxit security bulletin for specific patched version
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 patched version for your product. 3. Download and install the update. 4. Restart the application and system if prompted.
🔧 Temporary Workarounds
Disable JavaScript in Foxit PDF Reader
allDisabling JavaScript may prevent exploitation as many PDF-based attacks rely on JavaScript execution
Open Foxit Reader > File > Preferences > JavaScript > Uncheck 'Enable JavaScript'
Use Protected View
allEnable Protected View to open PDFs in a restricted mode
Open Foxit Reader > File > Preferences > Trust Manager > Check 'Enable Protected View'
🧯 If You Can't Patch
- Block PDF files from untrusted sources at network perimeter
- Implement application whitelisting to prevent unauthorized executables from running
🔍 How to Verify
Check if Vulnerable:
Check Foxit PDF Reader version in Help > About. Compare with patched version in Foxit security advisory.Check Version:
On Windows: Check Help > About in Foxit Reader GUI. No universal command-line method available.Verify Fix Applied:
Verify installed version matches or exceeds the patched version listed in Foxit's security bulletin.📡 Detection & Monitoring
Log Indicators:
- Application crashes of Foxit Reader
- Unusual process creation from Foxit Reader
- Suspicious file downloads followed by PDF opening
Network Indicators:
- Downloads of PDF files from suspicious sources
- Beaconing traffic from Foxit Reader process
SIEM Query:
Process Creation where Parent Process contains 'FoxitReader.exe' AND Command Line contains unusual parameters