CVE-2021-28918 : Security Advisory and Response

An improper input validation vulnerability in the netmask npm package v1.0.6 and below allows unauthenticated remote attackers to execute SSRF, RFI, and LFI attacks on dependent packages. This CVE could lead to unauthorized access to critical hosts.

Understanding CVE-2021-28918

This section covers what CVE-2021-28918 entails, its impact, technical details, and mitigation strategies.

What is CVE-2021-28918?

The CVE-2021-28918 vulnerability arises from improper input validation of octal strings in the netmask npm package versions 1.0.6 and earlier. It enables unauthenticated remote attackers to launch SSRF, RFI, and LFI attacks on various dependent packages.

The Impact of CVE-2021-28918

A remote unauthenticated attacker exploiting CVE-2021-28918 can bypass IP filtering implemented by packages relying on netmask. This can lead to unauthorized access to critical LAN and VPN hosts, posing a significant security risk.

Technical Details of CVE-2021-28918

This section outlines the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability in netmask npm package v1.0.6 and below allows unauthenticated remote attackers to perform SSRF, RFI, and LFI attacks on dependent packages, compromising the security posture of the affected systems.

Affected Systems and Versions

The netmask npm package versions 1.0.6 and below are susceptible to CVE-2021-28918, potentially impacting a wide range of applications and environments.

Exploitation Mechanism

Unauthenticated remote attackers can exploit this vulnerability by manipulating octal strings within the netmask npm package, facilitating SSRF, RFI, and LFI attacks on dependent packages.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2021-28918 and prevent potential security breaches.

Immediate Steps to Take

To address CVE-2021-28918, immediately update the netmask npm package to a secure version and monitor network activities for any signs of exploitation.

Long-Term Security Practices

Implement robust input validation mechanisms, conduct regular security assessments, and stay informed about emerging vulnerabilities to enhance long-term security.

Patching and Updates

Regularly check for security advisories and updates related to the netmask npm package to ensure that your systems are protected against known vulnerabilities.