CVE-2021-23490 : What You Need to Know

This CVE-2021-23490 article provides insights into the Regular Expression Denial of Service (ReDoS) vulnerability in the package parse-link-header before version 2.0.0.

Understanding CVE-2021-23490

CVE-2021-23490 involves a ReDoS vulnerability in the checkHeader function of parse-link-header before version 2.0.0.

What is CVE-2021-23490?

The package parse-link-header before version 2.0.0 is susceptible to Regular Expression Denial of Service (ReDoS) through the checkHeader function.

The Impact of CVE-2021-23490

With a CVSS base score of 7.5, this vulnerability has a high availability impact, posing a significant threat to affected systems.

Technical Details of CVE-2021-23490

This section delves into the technical aspects of CVE-2021-23490.

Vulnerability Description

The vulnerability arises from inadequate input validation in the checkHeader function, allowing malicious actors to exploit it for ReDoS attacks.

Affected Systems and Versions

The parse-link-header package versions prior to 2.0.0 are affected by this vulnerability.

Exploitation Mechanism

By crafting specific inputs that trigger excessive backtracking due to regex inefficiencies, attackers can cause denial of service.

Mitigation and Prevention

Learn about best practices to mitigate and prevent the exploitation of CVE-2021-23490.

Immediate Steps to Take

It is recommended to update to a version higher than 2.0.0 to mitigate the vulnerability. Additionally, input validation enhancements can help prevent ReDoS attacks.

Long-Term Security Practices

Regularly update software packages, perform security audits, and implement robust input validation mechanisms to enhance system security.

Patching and Updates

Stay informed about security patches and updates for the parse-link-header package to address vulnerabilities promptly.