CVE-2023-0853 : Security Advisory and Response

This CVE record, assigned by Canon, details a buffer overflow vulnerability in mDNS NSEC record registering process of Canon Office/Small Office Multifunction Printers and Laser Printers. Exploiting this vulnerability could allow an attacker on the network segment to render the affected product unresponsive or execute arbitrary code. The impacted product versions include various firmware versions sold in different regions.

Understanding CVE-2023-0853

This section will cover the key aspects of CVE-2023-0853, including what the vulnerability is and its potential impact.

What is CVE-2023-0853?

CVE-2023-0853 is a buffer overflow vulnerability found in the mDNS NSEC record registering process of Canon Office/Small Office Multifunction Printers and Laser Printers. This flaw could be exploited by an attacker on the same network segment to cause the affected device to become unresponsive or run arbitrary code.

The Impact of CVE-2023-0853

The impact of this vulnerability is severe, with a CVSS base score of 9.8 out of 10, categorizing it as a critical issue. The confidentiality, integrity, and availability of the affected devices are all at high risk, making it a significant security concern.

Technical Details of CVE-2023-0853

In this section, we will delve into the technical details of CVE-2023-0853, including vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability is classified as a stack-based buffer overflow (CWE-121) in the mDNS NSEC record registering process of specific Canon printer models. This allows an attacker to manipulate the device's memory, potentially leading to unauthorized code execution.

Affected Systems and Versions

The Canon Office/Small Office Multifunction Printers and Laser Printers firmware versions impacted by this vulnerability vary based on the region of sale. It includes models sold in Japan, US, and Europe with specific firmware versions mentioned in the description.

Exploitation Mechanism

To exploit CVE-2023-0853, an attacker needs to be on the same network segment as the vulnerable Canon printers. By sending specially crafted mDNS NSEC record requests, the attacker can trigger the buffer overflow condition and execute malicious code on the target device.

Mitigation and Prevention

Mitigating CVE-2023-0853 requires immediate action to secure the affected Canon printers and prevent potential exploitation. Here are the recommended steps for mitigation and long-term security practices.

Immediate Steps to Take

Implement network segmentation to restrict access to the vulnerable printers from untrusted sources.
Monitor network traffic for any suspicious mDNS NSEC record requests.
Apply security updates provided by Canon to patch the vulnerability.

Long-Term Security Practices

Regularly update and patch firmware on Canon printers to address known security vulnerabilities.
Conduct security training for network administrators to raise awareness about potential threats and best practices for network security.
Employ intrusion detection systems to identify and respond to anomalous network behavior promptly.

Patching and Updates

Canon has released security advisories and patches to address the CVE-2023-0853 vulnerability. It is crucial for organizations using the affected printer models to apply these updates promptly to secure their devices against potential exploitation.