CVE-2023-41257
📋 TL;DR
A type confusion vulnerability in Foxit Reader 12.1.2.15356 allows arbitrary code execution when processing malicious PDF files containing JavaScript. Attackers can exploit this by tricking users into opening malicious PDFs or visiting malicious websites with the browser plugin enabled. This affects all users running the vulnerable version of Foxit Reader.
💻 Affected Systems
- Foxit Reader
📦 What is this software?
Foxit Reader by Foxitsoftware
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the victim's machine, enabling data theft, ransomware deployment, or lateral movement.
Likely Case
Malware installation leading to data exfiltration, credential theft, or system disruption.
If Mitigated
Limited impact with proper security controls, potentially just application crash or denial of service.
🎯 Exploit Status
Exploitation requires user interaction (opening PDF or visiting malicious site). No public exploit code available at time of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 12.1.3 or later
Vendor Advisory: https://www.foxit.com/support/security-bulletins.html
Restart Required: Yes
Instructions:
1. Download latest Foxit Reader from official website. 2. Run installer. 3. Restart system. 4. Verify version is 12.1.3 or higher.
🔧 Temporary Workarounds
Disable JavaScript in Foxit Reader
allPrevents JavaScript execution in PDFs, blocking the exploitation vector.
Open Foxit Reader > File > Preferences > JavaScript > Uncheck 'Enable JavaScript'
Disable Browser Plugin
allPrevents web-based exploitation via malicious websites.
Browser settings > Extensions/Add-ons > Disable Foxit Reader plugin
🧯 If You Can't Patch
- Use alternative PDF readers that are not vulnerable
- Implement application whitelisting to block Foxit Reader execution
🔍 How to Verify
Check if Vulnerable:
Check Foxit Reader version in Help > About. If version is 12.1.2.15356, system is vulnerable.Check Version:
On Windows: wmic product where name='Foxit Reader' get versionVerify Fix Applied:
Verify version is 12.1.3 or higher in Help > About.📡 Detection & Monitoring
Log Indicators:
- Foxit Reader crash logs
- Unexpected JavaScript execution in PDF files
- Process creation from Foxit Reader
Network Indicators:
- Downloads of PDF files from suspicious sources
- Outbound connections from Foxit Reader process
SIEM Query:
process_name='FoxitReader.exe' AND (event_id=1000 OR parent_process contains 'browser')