CVE-2023-51560
📋 TL;DR
This vulnerability in Foxit PDF Reader allows remote attackers to execute arbitrary code by tricking users into opening malicious PDF files. The flaw exists in how the software handles annotation objects, enabling type confusion that can lead to remote code execution. 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 with attacker gaining full control of the victim's computer, data theft, ransomware deployment, and lateral movement within the network.
Likely Case
Malware installation, credential theft, and data exfiltration from the compromised system.
If Mitigated
Limited impact with potential application crash but no code execution if proper sandboxing or security controls are in place.
🎯 Exploit Status
Exploitation requires user interaction but no authentication. The vulnerability has been publicly disclosed with technical details, making weaponization likely.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2024.1 and later
Vendor Advisory: https://www.foxit.com/support/security-bulletins.html
Restart Required: Yes
Instructions:
1. Open Foxit PDF Reader
2. Go to Help > Check for Updates
3. Follow prompts to install version 2024.1 or later
4. Restart the application
🔧 Temporary Workarounds
Disable JavaScript in Foxit Reader
windowsPrevents JavaScript-based exploitation vectors
1. Open Foxit Reader
2. Go to File > Preferences
3. Select Trust Manager
4. Uncheck 'Enable JavaScript'
Use Protected View
windowsOpens PDFs in sandboxed mode to limit potential damage
1. Open Foxit Reader
2. Go to File > Preferences
3. Select Trust Manager
4. Enable 'Safe Reading Mode'
🧯 If You Can't Patch
- Block PDF files from untrusted sources at network perimeter
- Use alternative PDF readers that are not vulnerable
🔍 How to Verify
Check if Vulnerable:
Check Foxit Reader version in Help > About. If version is below 2024.1, the system is vulnerable.Check Version:
wmic product where name="Foxit Reader" get versionVerify Fix Applied:
Verify version is 2024.1 or higher in Help > About dialog.📡 Detection & Monitoring
Log Indicators:
- Unexpected Foxit Reader crashes
- Multiple PDF file openings from suspicious sources
- Process creation from Foxit Reader with unusual parameters
Network Indicators:
- Downloads of PDF files from suspicious domains
- Outbound connections from Foxit Reader process to unknown IPs
SIEM Query:
process_name:"FoxitReader.exe" AND (event_type:crash OR parent_process:explorer.exe AND cmdline:*pdf*)