CVE-2023-36821 Explained : Impact and Mitigation

Uptime Kuma, a self-hosted monitoring tool, is vulnerable to an authenticated remote code execution via malicious plugin installation.

Understanding CVE-2023-36821

This CVE involves a security issue in Uptime Kuma that allows an attacker to execute remote code by installing a malicious plugin.

What is CVE-2023-36821?

Uptime Kuma, a self-hosted monitoring tool, allows an authenticated attacker to install a maliciously crafted plugin in versions prior to 1.22.1, leading to remote code execution. The vulnerability arises from the installation of plugins via API endpoints that are not properly validated against an official list.

The Impact of CVE-2023-36821

The impact of this vulnerability is high, with confidentiality, integrity, and availability all at risk. An attacker could potentially take control of the affected system remotely.

Technical Details of CVE-2023-36821

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability arises from the ability of authenticated users to install plugins from an official list using API endpoints, allowing for the installation of malicious plugins that can lead to remote code execution.

Affected Systems and Versions

Uptime Kuma versions prior to 1.22.1 are affected by this vulnerability. Users of these versions are at risk of exploitation.

Exploitation Mechanism

By installing a maliciously crafted plugin that takes advantage of npm scripts, an attacker can achieve remote code execution on the target system. The lack of validation against the official list of plugins or the use of

npm install --ignore-scripts

facilitates this exploit.

Mitigation and Prevention

To address CVE-2023-36821, it is crucial to follow mitigation strategies and implement preventive measures.

Immediate Steps to Take

Users should update Uptime Kuma to version 1.22.1 or newer as it contains a patch for this vulnerability. Additionally, exercise caution when installing plugins and ensure they are from trusted sources.

Long-Term Security Practices

Implement secure coding practices, regularly update software, and conduct security audits to prevent future vulnerabilities. Limit access to plugin installation features to trusted users only.

Patching and Updates

Regularly check for updates and security patches for Uptime Kuma to address any known vulnerabilities and enhance the security posture of the system.