CVE-2017-12847 : Vulnerability Insights and Analysis

Nagios Core before version 4.3.3 is susceptible to a vulnerability that could allow local users to terminate processes by exploiting the creation of a nagios.lock PID file. This CVE was published on August 23, 2017, by MITRE.

Understanding CVE-2017-12847

This CVE affects Nagios Core versions prior to 4.3.3 and poses a risk of unauthorized process termination by local users.

What is CVE-2017-12847?

Nagios Core generates a nagios.lock PID file after switching to a non-root account, potentially enabling local users to terminate processes by modifying the file before a root script executes a specific command.

The Impact of CVE-2017-12847

The vulnerability allows local users to kill arbitrary processes by leveraging access to the non-root account for nagios.lock modification before a root script executes a command.

Technical Details of CVE-2017-12847

Nagios Core's vulnerability can be further understood through its technical details.

Vulnerability Description

Before version 4.3.3, Nagios Core creates a nagios.lock PID file after dropping privileges to a non-root account, which could be exploited by local users.

Affected Systems and Versions

Product: Nagios Core
Vendor: N/A
Versions Affected: Prior to 4.3.3

Exploitation Mechanism

Local users can exploit access to the non-root account and modify the nagios.lock file before a root script executes a specific command, enabling them to terminate processes.

Mitigation and Prevention

Protecting systems from CVE-2017-12847 requires immediate steps and long-term security practices.

Immediate Steps to Take

Upgrade Nagios Core to version 4.3.3 or newer to mitigate the vulnerability.
Monitor and restrict access to the nagios.lock file to prevent unauthorized modifications.

Long-Term Security Practices

Implement the principle of least privilege to restrict user access and permissions.
Regularly review and update security configurations to address potential vulnerabilities.

Patching and Updates

Stay informed about security advisories and updates from Nagios Core.
Apply patches promptly to address known vulnerabilities and enhance system security.