CVE-2023-50738
📋 TL;DR
This vulnerability allows attackers to bypass firmware downgrade protection on affected Lexmark printers, potentially enabling them to install older, vulnerable firmware versions. It affects Lexmark products that recently received the downgrade protection feature. Attackers with physical or network access to the printer could exploit this.
💻 Affected Systems
- Specific Lexmark printer models with the new downgrade protection feature
⚠️ 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
Attackers could downgrade to firmware with known critical vulnerabilities, then chain exploits to gain full device control, intercept print jobs, or use the printer as a network pivot point.
Likely Case
Malicious actors could downgrade firmware to versions with known vulnerabilities, then exploit those vulnerabilities to compromise the printer's functionality or access sensitive documents.
If Mitigated
With proper network segmentation and access controls, the impact is limited to potential printer compromise without broader network access.
🎯 Exploit Status
Exploitation likely requires some level of access to the printer's management interface or physical access to the device.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Lexmark security advisory for specific patched firmware versions
Vendor Advisory: https://www.lexmark.com/en_us/solutions/security/lexmark-security-advisories.html
Restart Required: Yes
Instructions:
1. Visit Lexmark security advisory page. 2. Identify affected printer models. 3. Download latest firmware from Lexmark support portal. 4. Upload firmware to printer via web interface or management tool. 5. Reboot printer to apply update.
🔧 Temporary Workarounds
Network segmentation
allIsolate printers on separate VLAN with restricted access
Access control hardening
allRestrict printer management interface access to authorized administrators only
🧯 If You Can't Patch
- Segment printers on isolated network segments with strict firewall rules
- Implement physical security controls to prevent unauthorized physical access to printers
🔍 How to Verify
Check if Vulnerable:
Check printer firmware version via web interface (Settings > Device > About) and compare against Lexmark's advisoryCheck Version:
N/A - Use printer web interface or management softwareVerify Fix Applied:
Verify firmware version has been updated to patched version listed in Lexmark advisory📡 Detection & Monitoring
Log Indicators:
- Firmware downgrade attempts in printer logs
- Unauthorized firmware upload events
Network Indicators:
- Unexpected firmware upload traffic to printers
- HTTP POST requests to firmware update endpoints
SIEM Query:
source="printer_logs" AND ("firmware downgrade" OR "unauthorized firmware")