CVE-2021-23518 : Security Advisory and Response

A detailed overview of the Prototype Pollution vulnerability in the cached-path-relative package.

Understanding CVE-2021-23518

This section will cover the description, impact, technical details, and mitigation strategies related to CVE-2021-23518.

What is CVE-2021-23518?

The package cached-path-relative before version 1.1.0 is vulnerable to Prototype Pollution due to the cache variable being set as {} instead of Object.create(null) in the cachedPathRelative function. This allows access to parent prototype properties, leading to an exploitable scenario.

The Impact of CVE-2021-23518

The vulnerability could result in an attacker accessing and modifying prototype properties, potentially leading to unauthorized actions or data manipulation within affected systems.

Technical Details of CVE-2021-23518

A deeper look into the vulnerability including description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

By manipulating the cache variable in the cached-path-relative package, attackers can compromise the integrity and availability of systems running vulnerable versions.

Affected Systems and Versions

The affected product is 'cached-path-relative' with versions prior to 1.1.0 being susceptible to the Prototype Pollution issue. Any system utilizing these versions is at risk.

Exploitation Mechanism

Exploiting the vulnerability involves using the cachedPathRelative function with a manipulated cache variable to gain unauthorized access to prototype properties and execute arbitrary code.

Mitigation and Prevention

Best practices to prevent and mitigate the impacts of CVE-2021-23518.

Immediate Steps to Take

Users are advised to update the 'cached-path-relative' package to version 1.1.0 or higher. Additionally, monitoring for any suspicious activities is crucial.

Long-Term Security Practices

Regularly audit third-party dependencies for known vulnerabilities and ensure timely updates and patches are applied to prevent such exploits.

Patching and Updates

Stay informed about security advisories related to 'cached-path-relative' package and apply patches promptly to secure systems against potential cyber threats.