CVE-2021-37770 : What You Need to Know

Nucleus CMS v3.71 is impacted by a serious file upload vulnerability that can be exploited by attackers to execute arbitrary commands on the target system. This could lead to severe consequences such as taking down website resources.

Understanding CVE-2021-37770

This section provides insights into the nature and impact of the CVE-2021-37770 vulnerability.

What is CVE-2021-37770?

CVE-2021-37770 is a file upload vulnerability affecting Nucleus CMS v3.71. Attackers can manipulate the upload path to bypass security restrictions and upload malicious files.

The Impact of CVE-2021-37770

The vulnerability allows attackers to upload a PHP file disguised as an image. By executing arbitrary commands through the uploaded file, attackers can compromise the integrity and availability of website resources.

Technical Details of CVE-2021-37770

In this section, we delve into the specific technical aspects of CVE-2021-37770.

Vulnerability Description

The vulnerability in Nucleus CMS v3.71 enables attackers to upload an Htaccess file with malicious contents, leading to execution of commands on the server.

Affected Systems and Versions

Nucleus CMS v3.71 is the specific version affected by this vulnerability. Users of this version are at risk of exploitation if proper mitigation measures are not implemented.

Exploitation Mechanism

By uploading a PHP file disguised as an image using the manipulated upload path, attackers can trick the server into executing the malicious code contained within the file.

Mitigation and Prevention

This section focuses on the steps that can be taken to mitigate the risks associated with CVE-2021-37770.

Immediate Steps to Take

Users of Nucleus CMS v3.71 are advised to restrict file upload permissions and sanitize all uploaded files to prevent unauthorized execution.

Long-Term Security Practices

Implementing regular security audits, keeping software up to date, and educating users on safe upload practices are crucial for long-term prevention of similar vulnerabilities.

Patching and Updates

Developers should release a patch addressing the file upload vulnerability in Nucleus CMS v3.71. Users must promptly apply the patch to secure their systems.