Tuesday, April 16, 2024

Critical “Netmask” npm Package Flaw Affects Hundreds of Thousands of Applications

Cybersecurity researchers Victor Viale, Sick Codes, Nick Sahler, Kelly Kaoudis, and John Jackson have recently detected a severe networking vulnerability in the Netmask npm package. In general, the apps use the Netmask to parse IPv4 addresses, and the CIDR relates them.

Apart from this, the component has procured more than 238 million downloads till now in its lifetime, and near about 278,000 GitHub repositories are also dependent on the netmask.

Due to the presence of the bug in the library, the netmask attends a distinct IP while parsing an IP address with zero in the lead, and this occurs due to the incorrect validations in place.

Leading Zero Alters the IP address

The security flaw that is being detected by the security experts is identified as “CVE-2021-28918,” and this flaw affects the working method and chain of the netmask.

The IPv4 addresses are generally expressed in decimal format, but the fact is that an IP address can be expressed in several formats.

Let’s make it a bit more clear, suppose your system’s IPv4 address interpreted in decimal format (, but due to the bug, the same IP could be displayed as 0780.0034.0014.0214, in octal format.

Suppose we give you an IP in a decimal format which is broadly conceived as the local loopback address or localhost, “” What if here we ask you to put a 0 before it? Will it parse 0127.0.0.1 as or something else?

While I tried this on the address bar of my Chrome web browser, it parsed me to this IP “,” as this is how the apps are made to handle these type of obscure IPs.

SSRF bypass to Remote File Inclusion

Initially, this bug may seem harmless, but, in reality, this flaw can lead an attacker to influence the IP address input and accelerate the inflation of various other security flaws from Server-Side Request Forgery (SSRF) bypass to RFI (Remote File Inclusion).

Moreover, the threat actors can easily exploit this flaw for Remote File Inclusion (RFI) with an IP address that seems private to the netmask.

There are many projects that use the netmask for IP parsing, and that’s why this security vulnerability is concerning security analysts.

Security fixes

The cybersecurity analysts who have discovered and reported the “CVE-2021-28918” flaw has pushed out a series of fixes. And with the netmask version 2.0.0, the researchers have fixed the “CVE-2021-28918” security flaw.

So, currently, the security analysts have strongly recommended the users upgrade their outdated netmask version to the fixed version 2.0.0. And to spread this awareness, they have also published their findings on different platforms.

You can follow us on LinkedinTwitterFacebook for daily Cybersecurity, and hacking news updates.


Latest articles

Hacker Customize LockBit 3.0 Ransomware to Attack Orgs Worldwide

Cybersecurity researchers at Kaspersky have uncovered evidence that cybercriminal groups are customizing the virulent...

Microsoft .NET, .NET Framework, & Visual Studio Vulnerable To RCE Attacks

A new remote code execution vulnerability has been identified to be affecting multiple Microsoft...

LightSpy Hackers Indian Apple Device Users to Steal Sensitive Data

The revival of the LightSpy malware campaign has been observed, focusing on Indian Apple...

LightSpy Malware Attacking Android and iOS Users

A new malware known as LightSpy has been targeting Android and iOS users.This sophisticated...

This Startup Aims To Simplify End-to-End Cybersecurity, So Anyone Can Do It

The Web3 movement is going from strength to strength with every day that passes....

Alert! Palo Alto RCE Zero-day Vulnerability Actively Exploited in the Wild

In a recent security bulletin, Palo Alto Networks disclosed a critical vulnerability in its...

6-year-old Lighttpd Flaw Impacts Intel And Lenovo Servers

The software supply chain is filled with various challenges, such as untracked security vulnerabilities...
Guru baran
Guru baranhttps://gbhackers.com
Gurubaran is a co-founder of Cyber Security News and GBHackers On Security. He has 10+ years of experience as a Security Consultant, Editor, and Analyst in cybersecurity, technology, and communications.

Top 3 SME Attack Vectors

Securing the Top 3 SME Attack Vectors

Cybercriminals are laying siege to small-to-medium enterprises (SMEs) across sectors. 73% of SMEs know they were breached in 2023. The real rate could be closer to 100%.

  • Stolen credentials
  • Phishing
  • Exploitation of vulnerabilities

Related Articles