CVE-2020-7799 : Exploit Details and Defense Strategies

An issue was discovered in FusionAuth before 1.11.0 where an authenticated user can execute commands on the underlying operating system by abusing Apache FreeMarker engine.

Understanding CVE-2020-7799

This CVE involves a vulnerability in FusionAuth that allows authenticated users to execute commands on the operating system.

What is CVE-2020-7799?

FusionAuth before version 1.11.0 is susceptible to a security flaw that enables authenticated users to run commands on the underlying OS by exploiting Apache FreeMarker engine.

The Impact of CVE-2020-7799

The vulnerability permits authenticated users to execute commands on the operating system, potentially leading to unauthorized access, data breaches, and system compromise.

Technical Details of CVE-2020-7799

This section provides detailed technical information about the CVE.

Vulnerability Description

The issue in FusionAuth allows authenticated users to execute commands on the underlying OS by misusing freemarker.template.utility.Execute in the Apache FreeMarker engine that processes custom templates.

Affected Systems and Versions

Affected Version: FusionAuth before 1.11.0
Systems: FusionAuth installations that have not been updated to version 1.11.0

Exploitation Mechanism

The vulnerability is exploited by authenticated users with permissions to edit e-mail templates or themes in FusionAuth, allowing them to execute commands on the OS.

Mitigation and Prevention

Protect your systems from CVE-2020-7799 by following these mitigation strategies.

Immediate Steps to Take

Update FusionAuth to version 1.11.0 to patch the vulnerability.
Restrict access to the affected functionalities for authenticated users.

Long-Term Security Practices

Regularly monitor and audit user activities within FusionAuth.
Educate users on secure practices to prevent unauthorized access.

Patching and Updates

Apply security patches and updates promptly to ensure the latest security measures are in place.