CVE-2019-20390 : What You Need to Know

A security flaw known as a Cross-Site Request Forgery (CSRF) vulnerability has been identified in Subrion CMS 4.2.1, allowing a remote attacker to delete server files without the victim's awareness.

Understanding CVE-2019-20390

This CVE involves a CSRF vulnerability in Subrion CMS 4.2.1 that can be exploited by a remote attacker to manipulate a GET request and delete server files.

What is CVE-2019-20390?

The vulnerability in Subrion CMS 4.2.1 enables an attacker to trick an authenticated user into visiting a malicious webpage, leading to the unauthorized deletion of server files.

The Impact of CVE-2019-20390

The CSRF flaw allows attackers to bypass CSRF token validation, potentially resulting in severe data loss or unauthorized file deletions on the server.

Technical Details of CVE-2019-20390

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises from the application's failure to validate the CSRF token for a specific GET request, enabling attackers to craft URLs to delete server files.

Affected Systems and Versions

Subrion CMS 4.2.1

Exploitation Mechanism

Attackers can manipulate the panel/uploads/read.json?cmd=rm URL to exclude the CSRF token, tricking authenticated users into unknowingly deleting server files.

Mitigation and Prevention

Protecting systems from this vulnerability requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Subrion CMS to the latest version that includes a patch for the CSRF vulnerability.
Educate users about the risks of clicking on suspicious links or visiting untrusted websites.

Long-Term Security Practices

Implement strict CSRF token validation mechanisms in web applications.
Regularly monitor and audit server files and activities to detect unauthorized changes.

Patching and Updates

Ensure timely installation of security patches and updates provided by Subrion CMS to address the CSRF vulnerability.