CVE-2024-11346
📋 TL;DR
A type confusion vulnerability in Lexmark printer PostScript interpreters allows attackers to inject resources and potentially execute arbitrary code. This affects Lexmark CX, XC, CS series printers and potentially other models with vulnerable PostScript modules. Attackers could exploit this to compromise printer functionality or use printers as network footholds.
💻 Affected Systems
- Lexmark CX series
- Lexmark XC series
- Lexmark CS series
- Other Lexmark models with PostScript interpreter modules
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete printer compromise, data exfiltration, lateral movement to connected networks, and persistent backdoor installation.
Likely Case
Printer denial of service, unauthorized access to print jobs and printer settings, and potential credential harvesting from printer memory.
If Mitigated
Limited impact to printer functionality with network segmentation and proper access controls preventing lateral movement.
🎯 Exploit Status
Exploitation requires understanding of PostScript interpreter internals and type confusion techniques. No public exploits available as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions beyond affected ranges listed in advisory
Vendor Advisory: https://www.lexmark.com/en_us/solutions/security/lexmark-security-advisories.html
Restart Required: Yes
Instructions:
1. Check current firmware version via printer web interface or display panel. 2. Visit Lexmark support site for your printer model. 3. Download latest firmware update. 4. Apply update following vendor instructions. 5. Verify update completed successfully.
🔧 Temporary Workarounds
Disable PostScript interpreter
allDisable PostScript processing if not required for your printing needs
Access printer web interface > Settings > Print Languages > Disable PostScript
Network segmentation
allIsolate printers to separate VLAN with restricted access
🧯 If You Can't Patch
- Implement strict network access controls allowing only trusted hosts to communicate with printers on port 9100/TCP and other printing ports
- Disable all unnecessary printer services and features, particularly network sharing and remote management options
🔍 How to Verify
Check if Vulnerable:
Check firmware version via printer web interface (Settings > Device Information) or physical display panel (Menu > Reports > Configuration Report)Check Version:
No CLI command - use web interface at http://<printer-ip>/settings or check physical displayVerify Fix Applied:
Confirm firmware version is outside affected ranges listed in advisory after update📡 Detection & Monitoring
Log Indicators:
- Unusual PostScript job submissions
- Multiple failed PostScript parsing attempts
- Printer firmware crash/restart logs
Network Indicators:
- Unusual traffic to printer port 9100/TCP from unexpected sources
- Malformed PostScript data in network captures
SIEM Query:
source="printer_logs" AND ("PostScript error" OR "interpreter fault" OR "firmware restart")