CVE-2020-21523 : Security Advisory and Response

A Server-Side Freemarker template injection vulnerability in halo CMS v1.1.3 allows arbitrary code execution.

Understanding CVE-2020-21523

This CVE describes a critical vulnerability in halo CMS version 1.1.3 that enables attackers to execute arbitrary code through a Freemarker template injection.

What is CVE-2020-21523?

Freemarker template injection vulnerability in halo CMS v1.1.3 allows malicious users to execute arbitrary code by manipulating the ftl files.

The Impact of CVE-2020-21523

The vulnerability can lead to unauthorized code execution, potentially compromising the entire system and data stored within it.

Technical Details of CVE-2020-21523

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The flaw exists in the Edit Theme File function of halo CMS v1.1.3, allowing attackers to edit ftl files and execute arbitrary code.

Affected Systems and Versions

Affected System: halo CMS v1.1.3
Affected Version: Not applicable

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious code into the Freemarker template file, leading to arbitrary code execution.

Mitigation and Prevention

Protecting systems from CVE-2020-21523 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable the Edit Theme File function if not essential for operations.
Implement input validation to prevent malicious code injection.
Monitor system logs for any suspicious activities.

Long-Term Security Practices

Regularly update halo CMS to the latest secure version.
Conduct security audits and penetration testing to identify vulnerabilities.
Educate developers and administrators on secure coding practices.

Patching and Updates

Apply patches and updates provided by halo CMS to address the vulnerability and enhance system security.