CVE-2021-40099 : Exploit Details and Defense Strategies

Concrete CMS through 8.5.5 allows remote code execution by fetching the update JSON scheme over HTTP.

Understanding CVE-2021-40099

Concrete CMS through version 8.5.5 is vulnerable to remote code execution when handling update JSON scheme over HTTP.

What is CVE-2021-40099?

CVE-2021-40099 is a vulnerability found in Concrete CMS, allowing an attacker to execute remote code by manipulating the HTTP fetching of update JSON scheme.

The Impact of CVE-2021-40099

This vulnerability can lead to remote code execution, enabling attackers to take control of the affected system and potentially compromise data and security.

Technical Details of CVE-2021-40099

Concrete CMS through version 8.5.5 is affected by the following technical details:

Vulnerability Description

An issue in Concrete CMS through version 8.5.5 allows attackers to achieve remote code execution by fetching the update JSON scheme over HTTP.

Affected Systems and Versions

Affected Product: Concrete CMS
Affected Version: up to 8.5.5

Exploitation Mechanism

Attackers exploit this vulnerability by manipulating the fetching of update JSON scheme over HTTP to execute remote code.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-40099, consider the following steps:

Immediate Steps to Take

Avoid fetching update JSON scheme over insecure HTTP connections.
Apply security patches or updates from the vendor.

Long-Term Security Practices

Implement HTTPS for secure communication.
Regularly monitor and update the CMS to the latest version.
Conduct security audits and penetration testing to identify vulnerabilities.

Patching and Updates

Ensure timely installation of security patches and updates provided by Concrete CMS to address the CVE-2021-40099 vulnerability.