CVE-2021-40343 : Security Advisory and Response

Nagios XI 5.8.5 has been found to have insecure file permissions, allowing the nagios user to escalate privileges to root.

Understanding CVE-2021-40343

This CVE identifies a security issue in Nagios XI 5.8.5.

What is CVE-2021-40343?

The vulnerability in Nagios XI 5.8.5 arises from insecure file permissions on the nagios_unbundler.py file, enabling the nagios user to gain root user privileges.

The Impact of CVE-2021-40343

The vulnerability could be exploited by an unauthorized user to elevate their privileges within the system, posing a significant security risk.

Technical Details of CVE-2021-40343

Explore the specifics of this CVE.

Vulnerability Description

The flaw in Nagios XI 5.8.5 stems from inadequate file permission settings on the nagios_unbundler.py file, facilitating privilege escalation for the nagios user to acquire root privileges.

Affected Systems and Versions

Affected Product: Nagios XI 5.8.5
Affected Version: n/a

Exploitation Mechanism

The vulnerability allows a malicious user with access to execute arbitrary commands through the nagios user account, leading to unauthorized elevation of privileges.

Mitigation and Prevention

Learn how to address and prevent this vulnerability.

Immediate Steps to Take

Immediately restrict access to the vulnerable file, limiting permissions.
Regularly monitor system logs for any unusual activity or privilege escalation attempts.

Long-Term Security Practices

Implement the principle of least privilege to restrict user capabilities.
Conduct regular security audits and penetration testing to identify and remediate vulnerabilities.

Patching and Updates

Apply the latest patches and updates provided by Nagios to address this vulnerability promptly.