CVE-2021-22970 : What You Need to Know

Concrete CMS (formerly concrete5) versions 8.5.6 and below and version 9.0.0 have a vulnerability that allows local IP importing, making the system vulnerable to SSRF attacks. This CVE can be exploited to read files from the local LAN and bypass SSRF Mitigation through DNS Rebinding.

Understanding CVE-2021-22970

This section provides detailed insights into the CVE-2021-22970 vulnerability.

What is CVE-2021-22970?

CVE-2021-22970 affects Concrete CMS versions below 8.5.6 and 9.0.0, enabling SSRF attacks on private LAN servers and allowing attackers to exploit local network applications.

The Impact of CVE-2021-22970

The vulnerability poses a risk of unauthorized access to files within the local LAN, potentially leading to data breaches and unauthorized network access.

Technical Details of CVE-2021-22970

In this section, we dive into the technical aspects of the CVE-2021-22970 vulnerability.

Vulnerability Description

Concrete CMS versions 8.5.6 and below and version 9.0.0 are susceptible to SSRF attacks, which can compromise the integrity and confidentiality of data stored within the local LAN.

Affected Systems and Versions

Affected versions include Concrete CMS versions below 8.5.6 and 9.0.0. Fixed versions are 9.0.1 and 8.5.7.

Exploitation Mechanism

Attackers exploit the vulnerability to read files from the local LAN and perform SSRF Mitigation Bypass through DNS Rebinding.

Mitigation and Prevention

Here are the steps to mitigate and prevent CVE-2021-22970.

Immediate Steps to Take

Users are advised to update their Concrete CMS installations to versions 9.0.1 and 8.5.7 to eliminate the vulnerability and enhance security.

Long-Term Security Practices

Regularly monitor for security updates and patches released by Concrete CMS to address vulnerabilities and enhance system security.

Patching and Updates

Concrete CMS is maintaining version 8.5.x until 1 May 2022 for security fixes. Stay updated with the latest security advisories and promptly apply patches.