CVE-2024-30336
📋 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 gain control of the current process, potentially leading to full system compromise. 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 takeover 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 code execution in the context of the current user, allowing data exfiltration, installation of additional malware, or credential theft.
If Mitigated
Limited impact with proper application sandboxing and least privilege principles, potentially contained to the PDF reader process.
🎯 Exploit Status
Exploitation requires user interaction (opening a malicious PDF) but no authentication. The vulnerability is in a widely used component and follows typical use-after-free exploitation patterns.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2024.1 and later
Vendor Advisory: https://www.foxit.com/support/security-bulletins.html
Restart Required: No
Instructions:
1. Open Foxit PDF Reader. 2. Go to Help > Check for Updates. 3. Follow prompts to install version 2024.1 or later. 4. Alternatively, download and install the latest version from Foxit's official website.
🔧 Temporary Workarounds
Disable JavaScript in Foxit PDF Reader
allPrevents JavaScript-based exploitation vectors that might be used to trigger this vulnerability
Open Foxit PDF Reader > File > Preferences > JavaScript > Uncheck 'Enable JavaScript'
Use Protected View
allOpens PDFs in a restricted mode that may prevent exploitation
Open Foxit PDF Reader > File > Preferences > Trust Manager > Check 'Enable Safe Reading Mode'
🧯 If You Can't Patch
- Use alternative PDF readers that are not vulnerable to this specific CVE
- Implement application whitelisting to block execution of Foxit PDF Reader
🔍 How to Verify
Check if Vulnerable:
Check Foxit PDF Reader version: Open Foxit > Help > About Foxit PDF Reader. If version is below 2024.1, the system is vulnerable.Check Version:
On Windows: wmic product where name="Foxit PDF Reader" get versionVerify Fix Applied:
Verify version is 2024.1 or later in Help > About Foxit PDF Reader. Test opening known safe PDF files to ensure functionality.📡 Detection & Monitoring
Log Indicators:
- Unexpected Foxit PDF Reader process crashes
- Multiple PDF file openings from unusual sources
- Process creation from Foxit PDF Reader to suspicious locations
Network Indicators:
- Outbound connections from Foxit PDF Reader process to unknown IPs
- DNS requests for suspicious domains following PDF opening
SIEM Query:
process_name:"FoxitPDFReader.exe" AND (event_id:1000 OR event_id:1001) | where process_version < "2024.1"