CVE-2021-23436 Explained : Impact and Mitigation

This CVE-2021-23436 article provides an in-depth understanding of the Prototype Pollution vulnerability affecting the immer package before version 9.0.6.

Understanding CVE-2021-23436

In this section, we will delve into the details of CVE-2021-23436, also known as the Prototype Pollution vulnerability.

What is CVE-2021-23436?

CVE-2021-23436 involves a type confusion vulnerability in the immer package before version 9.0.6. This vulnerability allows for a bypass of CVE-2020-28477 when user-provided keys used in the path parameter are arrays.

The Impact of CVE-2021-23436

The impact of CVE-2021-23436 is considered to be of medium severity. The vulnerability could result in a compromised system integrity with a CVSS base score of 5.6.

Technical Details of CVE-2021-23436

Let's explore the technical aspects of CVE-2021-23436 including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability in the immer package before version 9.0.6 arises due to a type confusion issue that can be exploited when user-provided keys used in the path parameter are arrays.

Affected Systems and Versions

The vulnerability affects the immer package before version 9.0.6. Users with versions less than 9.0.6 are at risk of exploitation.

Exploitation Mechanism

The exploitation of CVE-2021-23436 occurs via a type confusion vulnerability that allows threat actors to bypass certain conditions, potentially leading to security breaches.

Mitigation and Prevention

This section covers the essential steps to mitigate and prevent the CVE-2021-23436 vulnerability, ensuring enhanced security measures.

Immediate Steps to Take

Users are advised to update the immer package to version 9.0.6 or above to mitigate the risk of exploitation. It is crucial to apply official patches promptly.

Long-Term Security Practices

Implement secure coding practices, regularly update dependencies, and conduct security audits to prevent similar vulnerabilities in the future.

Patching and Updates

Stay informed about security patches and updates released by the immer package maintainers to address potential vulnerabilities promptly.