CVE-2023-50739
📋 TL;DR
A buffer overflow vulnerability in Lexmark devices' Internet Printing Protocol (IPP) allows attackers to execute arbitrary code remotely. This affects various Lexmark printer models running vulnerable firmware versions. Organizations using these devices are at risk of compromise.
💻 Affected Systems
- Various Lexmark printer models
⚠️ 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
Complete device takeover leading to network pivoting, data exfiltration, or ransomware deployment across connected systems.
Likely Case
Printer compromise enabling credential harvesting, network reconnaissance, or denial of service attacks.
If Mitigated
Limited impact with network segmentation and proper access controls preventing lateral movement.
🎯 Exploit Status
Requires network access to IPP service (typically port 631)
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware updates specified in Lexmark advisory
Vendor Advisory: https://www.lexmark.com/en_us/solutions/security/lexmark-security-advisories.html
Restart Required: Yes
Instructions:
1. Identify affected Lexmark models 2. Download latest firmware from Lexmark support portal 3. Apply firmware update following manufacturer instructions 4. Verify update completion
🔧 Temporary Workarounds
Network Segmentation
allIsolate printers from critical networks and restrict IPP access
IPP Service Disablement
allDisable Internet Printing Protocol if not required
🧯 If You Can't Patch
- Implement strict network access controls to printer IPP ports
- Monitor printer network traffic for anomalous IPP connections
🔍 How to Verify
Check if Vulnerable:
Check printer firmware version against Lexmark advisory listCheck Version:
Check printer web interface or use SNMP query for firmware versionVerify Fix Applied:
Confirm firmware version matches patched version in advisory📡 Detection & Monitoring
Log Indicators:
- Multiple failed IPP connections
- Unusual printer firmware activity
Network Indicators:
- Anomalous traffic to printer port 631
- Suspicious IPP payloads
SIEM Query:
destination_port:631 AND (protocol:ipp OR protocol:http) AND (anomalous_payload_size OR buffer_overflow_patterns)