CVE-2021-35973 : Security Advisory and Response

NETGEAR WAC104 devices before version 1.0.4.15 are impacted by an authentication bypass vulnerability, allowing unauthenticated attackers to manipulate actions and change passwords. This article provides an overview of CVE-2021-35973 and its implications.

Understanding CVE-2021-35973

This section delves into the details of the CVE-2021-35973 vulnerability affecting NETGEAR WAC104 devices.

What is CVE-2021-35973?

NETGEAR WAC104 devices with firmware versions prior to 1.0.4.15 are vulnerable to an authentication bypass flaw in /usr/sbin/mini_httpd. Exploiting this vulnerability enables unauthenticated attackers to alter the web UI password and potentially gain shell access on the device.

The Impact of CVE-2021-35973

The vulnerability poses a critical threat with a CVSS base score of 9.8, allowing attackers to escalate privileges and execute unauthorized actions on affected devices.

Technical Details of CVE-2021-35973

This section provides technical insights into the CVE-2021-35973 vulnerability.

Vulnerability Description

The vulnerability in /usr/sbin/mini_httpd enables unauthenticated attackers to trigger actions by adding specific substrings to the HTTP query, leading to unauthorized password changes and potential shell access.

Affected Systems and Versions

NETGEAR WAC104 devices running firmware versions below 1.0.4.15 are susceptible to this authentication bypass vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by appending the &currentsetting.htm substring to the HTTP query, enabling them to manipulate device settings and gain unauthorized access.

Mitigation and Prevention

This section outlines steps to mitigate the impact of CVE-2021-35973 and prevent similar vulnerabilities.

Immediate Steps to Take

Users of NETGEAR WAC104 devices should update their firmware to version 1.0.4.15 or newer to mitigate the authentication bypass vulnerability. Additionally, changing default passwords and restricting network access can enhance security.

Long-Term Security Practices

Implementing network segmentation, regular security audits, and ensuring timely security patch installations can bolster the overall security posture against such vulnerabilities.

Patching and Updates

Regularly monitoring for security advisories from NETGEAR and promptly applying patches for known vulnerabilities is crucial to maintaining a secure device environment.