CVE-2021-27405 : What You Need to Know

A ReDoS (regular expression denial of service) vulnerability has been identified in the @progfay/scrapbox-parser package prior to version 6.0.3 for Node.js. This vulnerability has been assigned the CVE ID CVE-2021-27405 and was published on February 19, 2021, with the last update on March 26, 2021.

Understanding CVE-2021-27405

This section will provide an overview of the identified vulnerability and its potential impact.

What is CVE-2021-27405?

CVE-2021-27405 is a ReDoS (regular expression denial of service) flaw found in the @progfay/scrapbox-parser package before version 6.0.3 for Node.js. This vulnerability could be exploited by an attacker to launch denial of service attacks.

The Impact of CVE-2021-27405

The impact of this vulnerability includes the potential for an attacker to execute denial of service attacks, disrupting the normal operation of systems relying on the vulnerable package.

Technical Details of CVE-2021-27405

In this section, we will delve into the technical aspects of the CVE, including the vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability arises due to the lack of proper input validation in the @progfay/scrapbox-parser package, allowing malicious actors to create specially crafted inputs, leading to excessive CPU consumption and denial of service.

Affected Systems and Versions

The @progfay/scrapbox-parser package versions prior to 6.0.3 for Node.js are affected by CVE-2021-27405. Users of these versions are urged to update to the latest secure versions.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending malicious input to the affected package, triggering the inefficient regular expression matching process and causing a denial of service condition.

Mitigation and Prevention

This section will provide guidance on mitigating the risks associated with CVE-2021-27405 and preventing potential exploitation.

Immediate Steps to Take

It is recommended to update the @progfay/scrapbox-parser package to version 6.0.3 or later to mitigate the vulnerability. Additionally, monitoring system resource usage for any signs of abnormal activity is advised.

Long-Term Security Practices

Implementing secure coding practices, conducting regular security audits, and staying informed about the latest vulnerabilities are essential for maintaining long-term security.

Patching and Updates

Stay informed about security updates and patches released by the package maintainer. Promptly applying these updates can help protect systems from known vulnerabilities.