CVE-2021-20127 : Vulnerability Insights and Analysis

A file deletion vulnerability has been discovered in Draytek VigorConnect 1.6.0-B3, allowing authenticated users to delete files with root privileges.

Understanding CVE-2021-20127

This CVE involves an arbitrary file deletion issue in a specific version of Draytek VigorConnect.

What is CVE-2021-20127?

CVE-2021-20127 refers to an improper access control vulnerability in the Html5Servlet endpoint of Draytek VigorConnect 1.6.0-B3. This flaw enables authenticated users to delete files across the target OS.

The Impact of CVE-2021-20127

The vulnerability can be exploited by malicious actors with existing access to potentially delete critical files, impacting the integrity and security of the system.

Technical Details of CVE-2021-20127

This section outlines the specifics of the vulnerability.

Vulnerability Description

The issue lies in the file deletion functionality of the Html5Servlet endpoint, allowing users to delete files on the target system with root privileges.

Affected Systems and Versions

Draytek VigorConnect version 1.6.0-B3 is affected by this vulnerability.

Exploitation Mechanism

An authenticated user can exploit this flaw to delete files arbitrarily on the target operating system, posing a significant security risk.

Mitigation and Prevention

Protecting systems from CVE-2021-20127 involves taking appropriate security measures.

Immediate Steps to Take

Users should update Draytek VigorConnect to a patched version to prevent exploitation of this vulnerability.

Long-Term Security Practices

Implement strict access controls and regularly monitor file deletions and system activities for any suspicious behavior.

Patching and Updates

Regularly check for security updates from the vendor and apply patches promptly to address known vulnerabilities.