CVE-2024-9251
📋 TL;DR
This CVE describes a use-after-free vulnerability in Foxit PDF Reader's annotation handling that allows information disclosure. Attackers can exploit it by tricking users into opening malicious PDF files, potentially leading to arbitrary 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
Full system compromise through arbitrary code execution leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Information disclosure and limited memory corruption that could be chained with other vulnerabilities for code execution.
If Mitigated
Information disclosure only, with no code execution due to security controls like ASLR, DEP, or sandboxing.
🎯 Exploit Status
Requires user interaction (opening malicious file). ZDI-CAN-24490 suggests proof-of-concept exists in controlled disclosure.
🛠️ 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 security bulletins page
2. Download latest version or security update
3. Install update
4. Restart system
🔧 Temporary Workarounds
Disable PDF Reader in Browser
allPrevent automatic PDF opening in web browsers
Browser-specific: Disable PDF viewer plugins/extensions
Use Alternative PDF Viewer
allTemporarily switch to different PDF software
🧯 If You Can't Patch
- Restrict PDF file opening to trusted sources only
- Implement application whitelisting to block Foxit Reader execution
🔍 How to Verify
Check if Vulnerable:
Check Foxit Reader version against vendor advisoryCheck Version:
Foxit Reader: Help → About (Windows) or Foxit Reader → About Foxit Reader (macOS)Verify Fix Applied:
Verify installed version matches or exceeds patched version from advisory📡 Detection & Monitoring
Log Indicators:
- Foxit Reader crash logs with memory access violations
- Unexpected annotation-related process behavior
Network Indicators:
- Downloads of PDF files from untrusted sources
- Unusual outbound connections after PDF opening
SIEM Query:
Process:foxitreader.exe AND (EventID:1000 OR ExceptionCode:c0000005)