CVE-2020-28909 : Exploit Details and Defense Strategies

Nagios Fusion 4.1.8 and earlier versions have an Incorrect File Permissions vulnerability that allows for Privilege Escalation to root via script modification, enabling low-privilege users to alter files executable by sudo.

Understanding CVE-2020-28909

This CVE identifies a security issue in Nagios Fusion versions 4.1.8 and earlier.

What is CVE-2020-28909?

The vulnerability in Nagios Fusion 4.1.8 and earlier versions allows low-privilege users to escalate their privileges to root by modifying scripts, potentially leading to unauthorized access and control of the system.

The Impact of CVE-2020-28909

The vulnerability poses a significant risk as it enables unauthorized users to gain elevated privileges, potentially leading to unauthorized system access and control.

Technical Details of CVE-2020-28909

This section provides technical details of the vulnerability.

Vulnerability Description

The Incorrect File Permissions in Nagios Fusion 4.1.8 and earlier versions allow low-privilege users to modify scripts, leading to Privilege Escalation to root.

Affected Systems and Versions

Nagios Fusion 4.1.8 and earlier versions

Exploitation Mechanism

The vulnerability can be exploited by low-privilege users to modify executable files, which can be run with elevated privileges using sudo.

Mitigation and Prevention

Protecting systems from CVE-2020-28909 is crucial to maintaining security.

Immediate Steps to Take

Apply the latest security patches provided by Nagios to address the vulnerability.
Restrict access to sensitive files and directories to authorized users only.
Monitor system logs for any suspicious activities related to file modifications.

Long-Term Security Practices

Implement the principle of least privilege to restrict user access rights.
Regularly review and update file permissions to ensure proper access control.
Conduct security training for users to raise awareness about the risks of unauthorized file modifications.

Patching and Updates

Regularly check for security updates and patches released by Nagios Fusion to address vulnerabilities like CVE-2020-28909.