CVE-2021-20124 : Exploit Details and Defense Strategies

A local file inclusion vulnerability exists in Draytek VigorConnect 1.6.0-B3 allowing unauthenticated attackers to download arbitrary files from the operating system with root privileges.

Understanding CVE-2021-20124

This vulnerability affects Draytek VigorConnect version 1.6.0-B3, enabling unauthorized users to exploit a security flaw in the file download feature of the WebServlet endpoint.

What is CVE-2021-20124?

CVE-2021-20124 is a local file inclusion vulnerability in Draytek VigorConnect 1.6.0-B3. Attackers can leverage this flaw to access and download files from the underlying operating system without authentication.

The Impact of CVE-2021-20124

The exploitation of this vulnerability could result in unauthorized access to sensitive files and data stored on the system, potentially leading to further compromise or data leakage.

Technical Details of CVE-2021-20124

Below are the key technical details associated with CVE-2021-20124:

Vulnerability Description

The vulnerability resides in the file download functionality of the WebServlet endpoint in Draytek VigorConnect 1.6.0-B3, allowing for unauthorized file access.

Affected Systems and Versions

The issue impacts Draytek VigorConnect version 1.6.0-B3. Users with this specific version are at risk of exploitation if not mitigated promptly.

Exploitation Mechanism

An unauthenticated attacker can exploit this vulnerability by manipulating file download requests, leading to the unauthorized retrieval of sensitive files.

Mitigation and Prevention

To safeguard your system from CVE-2021-20124, follow these security recommendations:

Immediate Steps to Take

Disable or restrict access to the WebServlet endpoint in Draytek VigorConnect.
Implement proper access controls to limit unauthorized downloads.

Long-Term Security Practices

Regularly update Draytek VigorConnect to the latest version to patch known vulnerabilities.
Conduct regular security audits and assessments to identify and remediate potential weaknesses.

Patching and Updates

Stay informed about security advisories from Draytek and apply relevant patches promptly to protect your system from emerging threats.