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Addressing Critical Vulnerabilities in Canon Small Office Printers

Canon recently addressed seven critical buffer-overflow bugs affecting its small office multifunction printers and laser printers. Tracked as CVE-2023-6229 through CVE-2023-6234 (plus CVE-2024-0244), these vulnerabilities can allow unauthenticated attackers to remotely perform denial of service (DoS) or arbitrary code execution against affected printers connected directly to the Internet.

The company assigned a "critical" rating of 9.8 out of 10 on the Common Vulnerability Scoring System (CVSS) scale to all the identified vulnerabilities. While no exploitations have been observed in the wild as of yet, owners are advised to scan for indicators of compromise, given that the bugs were publicly known but unpatched for months.


In light of these vulnerabilities, it is crucial for organizations to implement best practices for securing their network printers. Some recommended measures include:

  • Firmware Updates: Regularly update printer firmware to patch known security holes and add new or improved security features
  • Network Segmentation: Properly segment different areas of networks to prevent a compromised printer from affecting other sensitive devices
  • Access Controls: Deploy stricter user access controls and disable unnecessary services to minimize the attack surface
  • Wireless and Cloud Printing: Consider disabling wireless and cloud printing features to reduce potential entry points for unauthorized users.

By following these best practices, organizations can significantly enhance the security posture of their network printers and mitigate the risk of potential cyber threats.

SOURCES:

  • https://www.loffler.com/blog/printer-security-the-importance-of-patching-and-firmware-upgrades-in-the-face-of-printer-threats https://security.berkeley.edu/education-awareness/network-printer-security-best-practices
  • https://carbidesecure.com/resources/best-practices-for-printer-security/
  • https://www.osibeyond.com/blog/printer-cyber-security-risks-101/

About William Elward

Founder of Castle Ink, William Elward has 20 years experience in the printer industry. He's been featured on CNN Money, Yahoo, PC World, Computer World, and other top publications and frequently blogs about printers and ink cartridges. He's an expert at diagnosing printer issues and has published guides to fixing common printer issues across the internet. A graduate of Bryant University and Columbia's Sulzberger Executive Leadership Program, he's held various leadership positions at The College Board, Bankrate, Zocdoc, and Everyday Health. Follow him on Twitter at William Elward's Twitter Profile