CVE-2020-7928 : Security Advisory and Response

A user authorized to perform database queries may trigger a read overrun and access arbitrary memory by issuing specially crafted queries in MongoDB Server versions prior to 4.4.1, 4.2.9, 4.0.20, and 3.6.20.

Understanding CVE-2020-7928

This CVE involves improper neutralization of null byte leading to a read overrun vulnerability in MongoDB Server.

What is CVE-2020-7928?

CVE-2020-7928 is a vulnerability in MongoDB Server that allows an authorized user to exploit specially crafted queries to trigger a read overrun, potentially accessing arbitrary memory.

The Impact of CVE-2020-7928

The impact of this vulnerability is rated as MEDIUM severity with a CVSS base score of 6.5. It poses a high confidentiality impact but no integrity or availability impact.

Technical Details of CVE-2020-7928

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability arises from improper neutralization of null bytes, enabling a user to perform a read overrun in MongoDB Server.

Affected Systems and Versions

MongoDB Server v4.4 versions prior to 4.4.1
MongoDB Server v4.2 versions prior to 4.2.9
MongoDB Server v4.0 versions prior to 4.0.20
MongoDB Server v3.6 versions prior to 3.6.20

Exploitation Mechanism

The vulnerability can be exploited by an authorized user through specially crafted queries that trigger a read overrun, potentially allowing access to arbitrary memory.

Mitigation and Prevention

Protect your systems from CVE-2020-7928 with the following steps:

Immediate Steps to Take

Update MongoDB Server to versions 4.4.1, 4.2.9, 4.0.20, or 3.6.20 to mitigate the vulnerability.
Monitor and restrict database query permissions to authorized users only.

Long-Term Security Practices

Regularly review and update database security configurations.
Conduct security training for database administrators on secure coding practices.

Patching and Updates

Stay informed about security updates and patches released by MongoDB Inc.
Implement a robust patch management process to promptly apply security fixes.