CVE-2021-29442 : Vulnerability Insights and Analysis

Nacos is a platform designed for dynamic service discovery and configuration. However, a vulnerability in versions < 1.4.1 allows unauthenticated users to access sensitive endpoints, potentially leading to unauthorized database operations.

Understanding CVE-2021-29442

This CVE highlights an authentication bypass issue in Nacos versions prior to 1.4.1.

What is CVE-2021-29442?

In Nacos before version 1.4.1, unauthenticated users can access the /derby endpoint, which should be protected. This allows unauthorized access to crucial database operations.

The Impact of CVE-2021-29442

This vulnerability has a CVSS base score of 8.6, indicating a high severity level. It poses a risk of exposing confidential data without requiring privileges or user interaction.

Technical Details of CVE-2021-29442

The following provides more insight into the vulnerability:

Vulnerability Description

The ConfigOpsController in Nacos allows unauthenticated users to access the /derby endpoint, leading to potential unauthorized database operations.

Affected Systems and Versions

Nacos versions prior to 1.4.1 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this issue by accessing the unprotected /derby endpoint, enabling unauthorized database interactions.

Mitigation and Prevention

To address CVE-2021-29442, consider the following steps:

Immediate Steps to Take

Upgrade Nacos to version 1.4.1 or above to mitigate the vulnerability.
Restrict network access to the vulnerable endpoints.

Long-Term Security Practices

Implement strong authentication mechanisms to prevent unauthorized access.
Regularly monitor and audit access to sensitive endpoints.

Patching and Updates

Stay informed about security advisories and promptly apply patches released by Nacos.