CVE-2023-26068
📋 TL;DR
This CVE describes an input validation vulnerability in Lexmark device embedded web servers that allows remote code execution. Attackers can exploit this flaw to execute arbitrary code on affected Lexmark printers and multi-function devices. Organizations using vulnerable Lexmark devices are affected.
💻 Affected Systems
- Lexmark printers
- Lexmark multi-function devices
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent malware, steal sensitive documents, pivot to internal networks, or use devices as part of botnets.
Likely Case
Remote code execution leading to data exfiltration, device disruption, or lateral movement within the network.
If Mitigated
Limited impact if devices are properly segmented, have network access controls, and are monitored for suspicious activity.
🎯 Exploit Status
Packet Storm references indicate public exploit details available. CVSS 9.8 suggests trivial exploitation with high impact.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 2023-02-19
Vendor Advisory: https://publications.lexmark.com/publications/security-alerts/CVE-2023-26068.pdf
Restart Required: Yes
Instructions:
1. Check Lexmark support site for firmware updates. 2. Download latest firmware for your device model. 3. Apply firmware update via device web interface or management tools. 4. Reboot device after update.
🔧 Temporary Workarounds
Disable Embedded Web Server
allTurn off the vulnerable web server component if not required for operations.
Network Segmentation
allIsolate Lexmark devices to separate VLAN with strict access controls.
🧯 If You Can't Patch
- Implement strict network access controls allowing only necessary traffic to device IPs
- Monitor device logs for unusual web requests or authentication attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface (typically http://device-ip) and compare to Lexmark advisory.Check Version:
curl -s http://device-ip/ | grep -i version or check via device web interfaceVerify Fix Applied:
Confirm firmware version is newer than 2023-02-19 and test web interface functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to device web interface
- Multiple failed authentication attempts
- Unexpected process execution on device
Network Indicators:
- Suspicious HTTP traffic to printer ports (typically 80/443)
- Unexpected outbound connections from printer IPs
SIEM Query:
source="lexmark-device" AND (http_method="POST" AND uri_contains("vulnerable_endpoint") OR status_code=500)🔗 References
- http://packetstormsecurity.com/files/174763/Lexmark-Device-Embedded-Web-Server-Remote-Code-Execution.html
- https://publications.lexmark.com/publications/security-alerts/CVE-2023-26068.pdf
- https://support.lexmark.com/alerts/
- http://packetstormsecurity.com/files/174763/Lexmark-Device-Embedded-Web-Server-Remote-Code-Execution.html
- https://publications.lexmark.com/publications/security-alerts/CVE-2023-26068.pdf
- https://support.lexmark.com/alerts/
