CVE-2021-39173 : Security Advisory and Response

Cachet is an open-source status page system that is affected by a vulnerability known as Forced Reinstall.

Understanding CVE-2021-39173

This CVE details a security issue in the Cachet system that allows authenticated users to perform a forced reinstall, potentially leading to arbitrary code execution on the server.

What is CVE-2021-39173?

The CVE-2021-39173 vulnerability in Cachet allows authenticated users, regardless of their privileges, to trick the system and install the instance again, potentially enabling arbitrary code execution.

The Impact of CVE-2021-39173

The impact of this vulnerability is rated as HIGH, with a base score of 8.8 according to the CVSS v3.1 metrics. It affects confidentiality, integrity, and availability of the system.

Technical Details of CVE-2021-39173

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability arises from a flaw in the Cachet system, where authenticated users can force a reinstall, leading to potential code execution on the server.

Affected Systems and Versions

Product: Cachet
Vendor: fiveai
Affected Version: < 2.5.1

Exploitation Mechanism

The vulnerability can be exploited by authenticated users, irrespective of their privileges, by manipulating the instance installation process.

Mitigation and Prevention

It is crucial to take immediate action to mitigate the risks posed by CVE-2021-39173.

Immediate Steps to Take

Upgrade Cachet to version 2.5.1 to eliminate the vulnerability.
Restrict access to the administration dashboard to trusted IP addresses.

Long-Term Security Practices

Regularly monitor and apply security patches to Cachet.
Implement network security controls to prevent unauthorized access.

Patching and Updates

Update to Cachet version 2.5.1, which addresses the vulnerability and enhances security measures.