CVE-2020-7926 Explained : Impact and Mitigation

A user authorized to perform database queries may cause denial of service by issuing a specially crafted query in MongoDB Server version 4.4 prior to 4.4.1.

Understanding CVE-2020-7926

This CVE involves a specific query that can lead to a Denial of Service (DoS) attack against MongoDB Server.

What is CVE-2020-7926?

CVE-2020-7926 is a vulnerability in MongoDB Server version 4.4 that allows a user with query authorization to trigger a DoS by executing a specially crafted query.

The Impact of CVE-2020-7926

The impact of this vulnerability is rated as MEDIUM with a CVSS base score of 6.5. It can result in a denial of service condition due to a violation of an invariant in the server selection subsystem.

Technical Details of CVE-2020-7926

This section provides more technical insights into the CVE.

Vulnerability Description

A user with query authorization can exploit the vulnerability by issuing a specific query that disrupts the server selection subsystem.

Affected Systems and Versions

MongoDB Server version 4.4 (custom version) is affected.
Versions before 4.4.1 are not impacted by this vulnerability.

Exploitation Mechanism

The vulnerability can be exploited by sending a specially crafted query that violates an invariant in the server selection subsystem.

Mitigation and Prevention

Protecting systems from CVE-2020-7926 requires immediate actions and long-term security practices.

Immediate Steps to Take

Upgrade MongoDB Server to version 4.4.1 or later to mitigate the vulnerability.
Restrict query authorization to trusted users only.

Long-Term Security Practices

Regularly monitor and audit query activities to detect any suspicious behavior.
Implement network security measures to prevent unauthorized access to MongoDB Server.

Patching and Updates

Stay informed about security updates from MongoDB Inc. and apply patches promptly to address known vulnerabilities.