CVE-2021-20862 : Vulnerability Insights and Analysis

This CVE-2021-20862 involves an improper access control vulnerability found in ELECOM routers. The affected versions include various firmware versions of several ELECOM router models, allowing an unauthenticated attacker to bypass access restrictions.

Understanding CVE-2021-20862

This section will delve into the details of the vulnerability and its implications.

What is CVE-2021-20862?

The vulnerability in CVE-2021-20862 pertains to an improper access control issue in ELECOM routers that enables an unauthenticated attacker located adjacent to the network to bypass access restrictions. This flaw allows the attacker to acquire anti-CSRF tokens and manipulate the product's configurations through unspecified vectors.

The Impact of CVE-2021-20862

The impact of this vulnerability is significant as it can be exploited by an attacker without prior authentication, potentially leading to unauthorized access and alteration of the router's settings, compromising the security and integrity of the network.

Technical Details of CVE-2021-20862

In this section, we will explore the technical aspects of the CVE-2021-20862 vulnerability.

Vulnerability Description

The vulnerability arises due to improper access control mechanisms in the affected ELECOM router models, which fail to adequately restrict unauthorized users from manipulating device settings and obtaining anti-CSRF tokens.

Affected Systems and Versions

ELECOM routers impacted by this vulnerability include WRC-1167GST2, WRC-2533GS2, WRC-1750GS, WRC-1900GST, and others with specific firmware versions as mentioned in the descriptions.

Exploitation Mechanism

Attackers can exploit this vulnerability by leveraging the lack of proper access controls to gain unauthorized access, acquire anti-CSRF tokens, and modify the router's configurations via unspecified attack vectors.

Mitigation and Prevention

This section outlines the necessary steps to mitigate the risks associated with CVE-2021-20862 and prevent potential exploitation.

Immediate Steps to Take

Users are advised to implement network segmentation, firewall rules, and regularly monitor router settings for any unauthorized changes. Applying security patches and updates from ELECOM is crucial to address this vulnerability.

Long-Term Security Practices

To enhance long-term security, users should follow security best practices such as changing default credentials, restricting network access, and conducting regular security audits to identify and mitigate vulnerabilities.

Patching and Updates

ELECOM router users should stay informed about security advisories from the vendor and promptly apply patches and firmware updates to remediate CVE-2021-20862 and other known vulnerabilities.