CVE-2022-4873 : Security Advisory and Response

A stack-based buffer overflow vulnerability has been discovered in Netcomm router models NF20MESH, NF20, and NL1902. This vulnerability allows an attacker to overwrite the instruction pointer on the stack, leading to a crash in the application.

Understanding CVE-2022-4873

This section will provide detailed insights into the CVE-2022-4873 vulnerability affecting Netcomm router models NF20MESH, NF20, and NL1902.

What is CVE-2022-4873?

The CVE-2022-4873 vulnerability is a stack-based buffer overflow that impacts the sessionKey parameter in Netcomm router models NF20MESH, NF20, and NL1902. By providing a specific number of bytes, an attacker can overwrite the instruction pointer on the stack, causing the application to crash at a known location.

The Impact of CVE-2022-4873

This vulnerability could be exploited by remote attackers to execute arbitrary code, compromise the router, or disrupt network operations, posing a significant risk to the affected devices and networks.

Technical Details of CVE-2022-4873

In this section, we will delve into the technical aspects of the CVE-2022-4873 vulnerability, including its description, affected systems, and exploitation mechanism.

Vulnerability Description

The CVE-2022-4873 vulnerability arises due to a lack of proper input validation on the sessionKey parameter, allowing an attacker to send a specially crafted request to trigger a stack-based buffer overflow.

Affected Systems and Versions

Netcomm router models NF20MESH (version R6B025), NF20 (version R6B025), and NL1902 (version R6B025) are confirmed to be affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending a malicious request containing a specific number of bytes to the sessionKey parameter, enabling them to overwrite the instruction pointer on the stack and achieve remote code execution.

Mitigation and Prevention

This section outlines various steps to mitigate the risks associated with CVE-2022-4873 and prevent potential exploitation.

Immediate Steps to Take

Immediately applying security patches released by Netcomm for the affected router models is crucial to address the CVE-2022-4873 vulnerability and prevent exploitation by malicious actors.

Long-Term Security Practices

Incorporating robust security measures such as network segmentation, access control policies, and regular security audits can enhance the overall security posture of the network and devices, reducing the likelihood of successful attacks.

Patching and Updates

Regularly monitoring for security updates and patches from Netcomm, and promptly applying them to the affected router models, is essential to safeguard against known vulnerabilities like CVE-2022-4873 and ensure the security of network infrastructure.