CVE-2020-7921 Explained : Impact and Mitigation

A vulnerability in MongoDB Server allows a user with valid credentials to bypass IP whitelisting protection mechanisms following administrative action.

Understanding CVE-2020-7921

This CVE involves improper serialization of internal state in MongoDB Server's authorization subsystem, impacting various versions of MongoDB Server.

What is CVE-2020-7921?

This vulnerability enables a user to circumvent IP whitelisting protections after specific administrative actions in MongoDB Server.

The Impact of CVE-2020-7921

The vulnerability poses a medium severity risk with a CVSS base score of 4.6. It requires low privileges and user interaction, affecting confidentiality and integrity.

Technical Details of CVE-2020-7921

This section delves into the specifics of the vulnerability.

Vulnerability Description

Improper serialization in MongoDB Server's authorization subsystem allows users to bypass IP whitelisting protections post-administrative actions.

Affected Systems and Versions

MongoDB Server 4.2 versions prior to 4.2.3
MongoDB Server 4.0 versions prior to 4.0.15
MongoDB Server 4.3 versions prior to 4.3.3
MongoDB Server 3.6 versions prior to 3.6.18

Exploitation Mechanism

The vulnerability permits users with valid credentials to bypass IP whitelisting protections after specific administrative actions.

Mitigation and Prevention

Protect your systems from CVE-2020-7921 with the following steps:

Immediate Steps to Take

Update MongoDB Server to versions 4.2.3, 4.0.15, 4.3.3, or 3.6.18 to mitigate the vulnerability.
Monitor and restrict administrative actions that could trigger the bypass.

Long-Term Security Practices

Regularly review and update access control policies.
Conduct security training to educate users on best practices.

Patching and Updates

Stay informed about MongoDB Server security updates and apply patches promptly.