CVE-2021-23364 : Exploit Details and Defense Strategies

A detailed overview of CVE-2021-23364 highlighting the vulnerability in the browserslist package, its impact, technical details, and mitigation strategies.

Understanding CVE-2021-23364

This section provides insight into the vulnerability identified as Regular Expression Denial of Service (ReDoS) in the browserslist package.

What is CVE-2021-23364?

The package browserslist versions 4.0.0 to 4.16.5 are susceptible to ReDoS during the parsing of queries.

The Impact of CVE-2021-23364

The vulnerability poses a Medium severity risk with a CVSS base score of 5.3. It can be exploited remotely with no privileges required, impacting availability.

Technical Details of CVE-2021-23364

Delving into the specifics of the vulnerability, affected systems, and the exploitation mechanism.

Vulnerability Description

Regular Expression Denial of Service (ReDoS) occurs during the parsing of queries in the browserslist package, leading to potential service disruption.

Affected Systems and Versions

The browserslist package versions from 4.0.0 to 4.16.5 are impacted by this vulnerability, making them susceptible to ReDoS attacks.

Exploitation Mechanism

The vulnerability can be exploited over a network without requiring any specific privileges, affecting the availability of the system.

Mitigation and Prevention

Guidelines for addressing CVE-2021-23364 to enhance system security and prevent potential exploitation.

Immediate Steps to Take

Users are recommended to update browserslist to a non-vulnerable version and monitor for any unusual activity that could indicate exploitation.

Long-Term Security Practices

Implement regular security audits, stay informed about updates and patches, and follow secure coding practices to mitigate future risks.

Patching and Updates

Stay informed about security patches released by browserslist, promptly apply updates to eliminate vulnerabilities and strengthen system security.