CVE-2023-33621 Explained : Impact and Mitigation

A security vulnerability has been identified in GL.iNET GL-AR750S-Ext firmware v3.215, marked as CVE-2023-33621. This CVE points out a weakness that could potentially enable attackers to bypass authentication protocols via session replay attacks.

Understanding CVE-2023-33621

This section elaborates on the nature and potential risks associated with the CVE-2023-33621 vulnerability.

What is CVE-2023-33621?

The GL.iNET GL-AR750S-Ext firmware v3.215 is susceptible to a security flaw that inadvertently exposes the admin authentication token in a GET request during the download of the OpenVPN Server config file. The token could remain stored in browser history or access logs, paving the way for malicious actors to compromise security through session replay techniques.

The Impact of CVE-2023-33621

The impact of this vulnerability is significant as it compromises the confidentiality and integrity of user data by allowing unauthorized access to sensitive information. Attackers exploiting this vulnerability can bypass authentication barriers, leading to potential data breaches and unauthorized system access.

Technical Details of CVE-2023-33621

This section delves into the technical aspects of the CVE-2023-33621 vulnerability and how it can be leveraged by threat actors.

Vulnerability Description

The vulnerability stems from the flawed implementation of inserting the admin authentication token into a GET request, exposing it inadvertently and leaving it vulnerable to interception.

Affected Systems and Versions

The GL-AR750S-Ext firmware v3.215 is confirmed to be affected by this vulnerability, impacting systems that operate on this specific firmware version.

Exploitation Mechanism

Exploiting CVE-2023-33621 requires the interception of the admin authentication token from the GET request during the OpenVPN Server config file download. Attackers can then leverage this token for unauthorized access through session replay attacks.

Mitigation and Prevention

This section outlines the steps and practices to mitigate the risks posed by CVE-2023-33621 and prevent exploitation.

Immediate Steps to Take

Immediately cease using the affected firmware version and clear browser history to remove any stored authentication tokens. It is crucial to update to a patched version that addresses this vulnerability.

Long-Term Security Practices

In the long term, ensure regular security audits, stay updated on firmware patches, and implement strong authentication mechanisms to bolster overall system security.

Patching and Updates

Vendor-released patches and updates should be promptly applied to eliminate the vulnerability and enhance system security against potential threats.