CVE-2023-26067
📋 TL;DR
CVE-2023-26067 is an input validation vulnerability in Lexmark device embedded web servers that allows remote code execution. Attackers can exploit this to execute arbitrary code on affected Lexmark printers and multi-function devices. Organizations using Lexmark devices with vulnerable firmware versions are affected.
💻 Affected Systems
- Lexmark printers
- Lexmark multi-function devices
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attackers to install persistent malware, steal sensitive data, pivot to internal networks, and disrupt printing operations.
Likely Case
Remote code execution leading to device takeover, data exfiltration, and potential lateral movement within the network.
If Mitigated
Limited impact with proper network segmentation and access controls preventing exploitation attempts.
🎯 Exploit Status
Public exploit details available on Packet Storm. Exploitation appears straightforward based on available information.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware versions after 2023-02-19
Vendor Advisory: https://publications.lexmark.com/publications/security-alerts/CVE-2023-26067.pdf
Restart Required: Yes
Instructions:
1. Check current firmware version on Lexmark devices. 2. Download latest firmware from Lexmark support portal. 3. Apply firmware update following manufacturer instructions. 4. Reboot devices after update completion.
🔧 Temporary Workarounds
Disable Embedded Web Server
allTemporarily disable the embedded web server interface to prevent exploitation
Configure via device web interface: Settings > Network/Ports > Embedded Web Server > Disable
Network Segmentation
allIsolate Lexmark devices to separate VLAN with restricted access
🧯 If You Can't Patch
- Implement strict network access controls allowing only necessary traffic to Lexmark devices
- Monitor device logs for suspicious web server activity and exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface: http://[device-ip]/settings or via device control panelCheck Version:
curl -s http://[device-ip]/settings | grep -i firmwareVerify Fix Applied:
Verify firmware version is newer than 2023-02-19 and test web server functionality📡 Detection & Monitoring
Log Indicators:
- Unusual web server requests
- Multiple failed authentication attempts
- Suspicious file uploads to device
Network Indicators:
- Unexpected outbound connections from printers
- Exploit pattern traffic to device web ports
SIEM Query:
source="lexmark-device" AND (url="*cgi*" OR method="POST" AND uri="*upload*")🔗 References
- http://packetstormsecurity.com/files/174763/Lexmark-Device-Embedded-Web-Server-Remote-Code-Execution.html
- https://publications.lexmark.com/publications/security-alerts/CVE-2023-26067.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-2023-26067.pdf
- https://support.lexmark.com/alerts/
