CVE-2020-24908 : Security Advisory and Response

Checkmk before 1.6.0p17 allows local users to obtain SYSTEM privileges via a Trojan horse shell script in the %PROGRAMDATA%\checkmk\agent\local directory.

Understanding CVE-2020-24908

Checkmk before version 1.6.0p17 has a vulnerability that enables local users to escalate privileges to SYSTEM level.

What is CVE-2020-24908?

This CVE refers to a security flaw in Checkmk that allows unauthorized local users to gain elevated privileges by placing a malicious shell script in a specific directory.

The Impact of CVE-2020-24908

The vulnerability can be exploited by local users to execute arbitrary commands with elevated privileges, potentially leading to unauthorized access and control of the system.

Technical Details of CVE-2020-24908

Checkmk before version 1.6.0p17 is susceptible to a local privilege escalation vulnerability.

Vulnerability Description

A local user can place a Trojan horse shell script in the %PROGRAMDATA%\checkmk\agent\local directory to gain SYSTEM privileges.

Affected Systems and Versions

Product: Checkmk
Versions affected: Before 1.6.0p17

Exploitation Mechanism

The exploit involves placing a malicious shell script in a specific directory to escalate privileges to SYSTEM level.

Mitigation and Prevention

It is crucial to take immediate steps to mitigate the risks posed by CVE-2020-24908.

Immediate Steps to Take

Update Checkmk to version 1.6.0p17 or later to patch the vulnerability.
Regularly monitor and restrict access to critical directories to prevent unauthorized modifications.

Long-Term Security Practices

Implement the principle of least privilege to restrict user access rights.
Conduct regular security audits and vulnerability assessments to identify and address potential risks.
Educate users on safe computing practices and the importance of not executing unknown scripts.

Patching and Updates

Apply security patches and updates promptly to ensure that known vulnerabilities are addressed and system security is maintained.