CVE-2022-24363
📋 TL;DR
CVE-2022-24363 is a use-after-free vulnerability in Foxit PDF Reader that allows remote attackers to execute arbitrary code when users open malicious PDF files or visit malicious web pages. This affects users of Foxit PDF Reader version 11.1.0.52543 who open untrusted PDF documents.
💻 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 PDF Reader process, potentially leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Malware installation or data exfiltration when users open malicious PDFs from phishing emails or compromised websites.
If Mitigated
Limited impact if PDF Reader runs with restricted privileges and users avoid opening untrusted documents.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious PDF) but the vulnerability is well-documented and weaponization is likely given the high CVSS score and public details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 11.1.1 or 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 latest version. 4. Restart computer after installation.
🔧 Temporary Workarounds
Disable JavaScript in PDF Reader
allPrevents exploitation via malicious JavaScript in PDF files
In Foxit Reader: File > Preferences > JavaScript > Uncheck 'Enable JavaScript'
Use Protected View
allOpen PDFs in sandboxed mode to limit potential damage
In Foxit Reader: File > Preferences > Trust Manager > Check 'Enable Safe Reading Mode'
🧯 If You Can't Patch
- Uninstall Foxit PDF Reader 11.1.0.52543 and use alternative PDF viewers
- Implement application whitelisting to block execution of vulnerable Foxit Reader version
🔍 How to Verify
Check if Vulnerable:
Check Foxit Reader version: Open Foxit Reader > Help > About Foxit Reader. If version is 11.1.0.52543, system is vulnerable.Check Version:
On Windows: wmic product where name="Foxit Reader" get versionVerify Fix Applied:
Verify version is 11.1.1 or later in Help > About Foxit Reader.📡 Detection & Monitoring
Log Indicators:
- Application crashes of Foxit Reader
- Unusual process creation from Foxit Reader
- Memory access violations in application logs
Network Indicators:
- Outbound connections from Foxit Reader to suspicious domains
- Downloads of PDF files from untrusted sources
SIEM Query:
EventID=1000 OR EventID=1001 AND ProcessName="FoxitReader.exe" AND Version="11.1.0.52543"