CVE-2019-2389 : Exploit Details and Defense Strategies

A vulnerability in MongoDB Server allows users with write access to the PID file to manipulate the PIDs that will be killed when the root user stops the MongoDB process via SysV init.

Understanding CVE-2019-2389

This CVE involves a security issue in MongoDB Server that enables unauthorized users to interfere with the termination process of the MongoDB service.

What is CVE-2019-2389?

The vulnerability in MongoDB Server's packaged SysV init scripts permits users with PID file write access to insert arbitrary PIDs for termination when the MongoDB process is stopped by the root user.

The Impact of CVE-2019-2389

The vulnerability poses a medium severity risk with a CVSS base score of 5.3. It requires low privileges but has a high availability impact, affecting MongoDB Server versions prior to 4.0.11, 3.6.14, and 3.4.22.

Technical Details of CVE-2019-2389

This section delves into the specifics of the vulnerability.

Vulnerability Description

The incorrect scoping of kill operations in MongoDB Server's SysV init scripts allows unauthorized users to manipulate the PIDs targeted for termination.

Affected Systems and Versions

MongoDB Server v4.0 versions prior to 4.0.11
MongoDB Server v3.6 versions prior to 3.6.14
MongoDB Server v3.4 versions prior to 3.4.22

Exploitation Mechanism

Unauthorized users with write access to the PID file can insert arbitrary PIDs to be terminated when the MongoDB process is stopped.

Mitigation and Prevention

Protecting systems from this vulnerability requires immediate actions and long-term security practices.

Immediate Steps to Take

Update MongoDB Server to versions 4.0.11, 3.6.14, or 3.4.22 to mitigate the vulnerability.
Restrict access to the PID file to authorized users only.

Long-Term Security Practices

Regularly review and update access control policies for critical system files.
Monitor and audit PID file modifications for suspicious activities.

Patching and Updates

Apply patches provided by MongoDB Inc. promptly to address the vulnerability and enhance system security.