CVE-2019-20149 : Exploit Details and Defense Strategies

In version 6.0.2 of the kind-of package, a vulnerability in the ctorName function allows external user input to override specific internal attributes, potentially leading to a type detection manipulation.

Understanding CVE-2019-20149

What is CVE-2019-20149?

CVE-2019-20149 is a vulnerability in the kind-of package version 6.0.2 that enables attackers to manipulate the type detection process by overriding internal attributes with external input.

The Impact of CVE-2019-20149

This vulnerability can be exploited by malicious actors to create payloads that alter the built-in attribute, affecting the outcome of type detection.

Technical Details of CVE-2019-20149

Vulnerability Description

The ctorName function in index.js of kind-of v6.0.2 allows external input to overwrite internal attributes, such as 'constructor': {'name':'Symbol'}, enabling manipulation of type detection results.

Affected Systems and Versions

Affected Version: 6.0.2

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting payloads that override specific internal attributes, impacting the type detection process.

Mitigation and Prevention

Immediate Steps to Take

Update to a patched version of the kind-of package to mitigate the vulnerability.
Avoid processing untrusted user input that could potentially exploit this issue.

Long-Term Security Practices

Implement input validation mechanisms to sanitize user input effectively.
Regularly monitor for security updates and apply patches promptly.

Patching and Updates

Stay informed about security advisories related to the kind-of package and apply patches as soon as they are available.