CVE-2021-4242 : Vulnerability Insights and Analysis

A critical vulnerability was discovered in Sapido BR270n, BRC76n, GR297, and RB1732 routers, affecting the file ip/syscmd.htm. This vulnerability allows for OS command injection, potentially exploitable remotely. Here's what you need to know about CVE-2021-4242.

Understanding CVE-2021-4242

This section provides insights into what CVE-2021-4242 entails.

What is CVE-2021-4242?

CVE-2021-4242 is a critical vulnerability in Sapido routers that enables an attacker to perform OS command injection through the file ip/syscmd.htm. The exploitation of this vulnerability can be carried out remotely.

The Impact of CVE-2021-4242

The impact of CVE-2021-4242 is significant as it allows threat actors to execute arbitrary OS commands on affected routers, potentially leading to unauthorized access and control.

Technical Details of CVE-2021-4242

In this section, we delve into the technical aspects of CVE-2021-4242.

Vulnerability Description

The vulnerability arises from improper neutralization, specifically injection leading to OS command execution, posing a risk of unauthorized command execution.

Affected Systems and Versions

The following Sapido router models are affected: BR270n, BRC76n, GR297, and RB1732. All versions of these models are susceptible to the OS command injection vulnerability.

Exploitation Mechanism

Attackers can exploit CVE-2021-4242 remotely by inserting malicious commands through the affected file, enabling them to execute unauthorized actions on the routers.

Mitigation and Prevention

This section outlines steps to mitigate and prevent the exploitation of CVE-2021-4242.

Immediate Steps to Take

Users are advised to restrict remote access to the routers, apply security updates promptly, and monitor network traffic for any suspicious activities.

Long-Term Security Practices

Implementing network segmentation, strong access controls, and regular security assessments can enhance the overall security posture against such vulnerabilities.

Patching and Updates

It is crucial for users to install security patches provided by Sapido to address the CVE-2021-4242 vulnerability and enhance the security of the affected routers.