CVE-2021-23440 : What You Need to Know

A detailed overview of CVE-2021-23440 affecting the package set-value before version <2.0.1 and >=3.0.0 <4.0.1, leading to a type confusion vulnerability with significant impact.

Understanding CVE-2021-23440

This CVE, titled 'Prototype Pollution', was made public on September 12, 2021, affecting the set-value package.

What is CVE-2021-23440?

The impact of CVE-2021-23440 is a type confusion vulnerability within set-value that may allow attackers to bypass certain security measures.

The Impact of CVE-2021-23440

With a CVSS v3.1 base score of 7.3 and a severity rating of HIGH, this vulnerability has a low attack complexity and impacts confidentiality, integrity, and availability.

Technical Details of CVE-2021-23440

This section dives into the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

An issue in versions <2.0.1 and >=3.0.0 <4.0.1 allows an attacker to exploit type confusion by using user-provided keys in the path parameter as arrays.

Affected Systems and Versions

The vulnerability affects versions <2.0.1 and >=3.0.0 <4.0.1 of the set-value package.

Exploitation Mechanism

By leveraging the type confusion vulnerability, attackers can manipulate user-provided keys to bypass security controls.

Mitigation and Prevention

Learn how to secure your systems and prevent exploitation of CVE-2021-23440.

Immediate Steps to Take

Update the set-value package to versions above 4.0.1 to mitigate this vulnerability. Implement input validation to prevent type confusion attacks.

Long-Term Security Practices

Regularly update dependencies and stay informed about security alerts to address vulnerabilities promptly.

Patching and Updates

Stay informed about security patches from the vendor and apply them promptly to ensure the security of your systems.