CVE-2020-21474 : Exploit Details and Defense Strategies

This CVE record pertains to a File Upload vulnerability in NucleusCMS v.3.71 that allows a remote attacker to execute arbitrary code.

Understanding CVE-2020-21474

This CVE identifies a critical security issue in NucleusCMS v.3.71 that can be exploited by malicious actors to run unauthorized code on the affected system.

What is CVE-2020-21474?

The vulnerability in NucleusCMS v.3.71 enables attackers to execute arbitrary code through a specific parameter, posing a significant risk to the security of the system.

The Impact of CVE-2020-21474

Exploitation of this vulnerability can lead to unauthorized code execution, potentially resulting in data breaches, system compromise, and other malicious activities.

Technical Details of CVE-2020-21474

This section provides detailed technical information about the CVE.

Vulnerability Description

The vulnerability exists in the file upload functionality of NucleusCMS v.3.71, specifically through the /nucleus/plugins/skinfiles/?dir=rsd parameter, allowing attackers to upload and execute malicious code.

Affected Systems and Versions

Vendor: NucleusCMS
Product: NucleusCMS v.3.71
Affected Version: All versions of NucleusCMS v.3.71

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating the /nucleus/plugins/skinfiles/?dir=rsd parameter to upload malicious files, which can then be executed on the target system.

Mitigation and Prevention

Protecting systems from CVE-2020-21474 requires immediate action and long-term security measures.

Immediate Steps to Take

Disable file uploads in NucleusCMS v.3.71 to prevent exploitation of the vulnerability.
Implement strict input validation to block malicious file uploads.

Long-Term Security Practices

Regularly update NucleusCMS to the latest version to patch known vulnerabilities.
Conduct security audits and penetration testing to identify and address potential weaknesses.

Patching and Updates

Apply patches released by NucleusCMS promptly to address the vulnerability and enhance system security.