CVE-2021-20125 : What You Need to Know

This article provides an in-depth look at CVE-2021-20125, outlining the vulnerability, its impact, technical details, and mitigation steps.

Understanding CVE-2021-20125

CVE-2021-20125 is an arbitrary file upload and directory traversal vulnerability found in Draytek VigorConnect 1.6.0-B3, allowing unauthenticated attackers to upload files to any location on the target OS with root privileges.

What is CVE-2021-20125?

This vulnerability enables attackers to upload files and traverse directories in Draytek VigorConnect 1.6.0-B3 without authentication, potentially leading to unauthorized access and data manipulation.

The Impact of CVE-2021-20125

The arbitrary file upload and directory traversal vulnerability in Draytek VigorConnect 1.6.0-B3 can be exploited by malicious actors to gain unauthorized root access on the target system, posing a significant security risk.

Technical Details of CVE-2021-20125

The following technical aspects shed light on the vulnerability's description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

The flaw exists in the file upload functionality of DownloadFileServlet in Draytek VigorConnect 1.6.0-B3, allowing attackers to upload files to any OS location with root privileges.

Affected Systems and Versions

Draytek VigorConnect 1.6.0-B3 is specifically impacted by this vulnerability, potentially affecting systems with this version installed.

Exploitation Mechanism

Unauthenticated attackers can exploit this vulnerability by leveraging the file upload functionality to upload malicious files and traverse directories, gaining root access.

Mitigation and Prevention

To prevent exploitation of CVE-2021-20125, immediate steps, long-term security practices, and the importance of patching and updates are crucial.

Immediate Steps to Take

Organizations should restrict access to vulnerable services, apply security patches promptly, and monitor for any suspicious activities or file uploads.

Long-Term Security Practices

Implementing proper access controls, conducting regular security audits, and providing security awareness training can enhance overall cybersecurity posture.

Patching and Updates

Regularly updating Draytek VigorConnect to secure versions, applying vendor-recommended security patches, and monitoring security advisories are essential to mitigate the risk associated with CVE-2021-20125.