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What Is Log4j? How you can be secure from it?

Log4j is a Java package for recording error messages in applications that are already used by many systems. However, a vulnerability recently reported by Apache might allow hackers to have unrestricted access to machines all across the world.

Cybercriminals are already trying to exploit this flaw, putting all kinds of online apps, open-source software, cloud platforms, and email services in danger.

What Is Log4j?

Inserting log lines into code is a reliable way for debugging software during its development lifetime. Log4j is a Java logging package that is both dependable and configurable.

Log4j is actually an open-source database that operates on all main platforms, with Windows, Apple’s macOS, and Linux. It was created and is maintained by the Apache Software Foundation.

How Is Log4j Used?

Logging is essential in software development since it shows the system’s status during runtime. Having access to system activity records at all times may be quite beneficial in spotting potential issues.

Developers, of course, utilize Log4j at various stages of the development process. Online gaming, corporate applications, and cloud data centers all use it.

Log4j is made up of three fundamental components: loggers, appenders, and layouts. They all work together to fulfill the objective of logging in a methodical manner.

What Is the Log4j Vulnerability?

Because of the vulnerability, systems that use it are vulnerable to outside intrusions, making it easier for threat actors to sneak inside and get privileged access.


This vulnerability had always existed and had gone unnoticed until it was identified in 2020. However, when a LunaSec researcher discovered the vulnerability in Microsoft’s Minecraft, Apache has now formally revealed it in the Log4j library.

Since then, other attackers have inevitably begun to exploit it, quickly turning this previously overlooked (or so it appears) weakness into something more dangerous.

Which Systems and Devices Are at Risk?

The Log4j library is used by every major Java-based corporate program and server. Many services are vulnerable to this attack due to their extensive use across software programs and web services.

It can harm any device connected to the internet that runs Apache Log4j versions 2.0 to 2.14.1. Apple’s iCloud, Microsoft’s Minecraft, Twitter, Steam, Tencent, Google, Amazon, CloudFare, NetEase, Webex, and LinkedIn are just a few of the services that use Log4j.

It has a lot of ramifications because it’s a zero-day vulnerability. If left unpatched, it can open a can of worms, with attackers being able to hack into computers, steal passwords and logins, and infect networks with malicious malware.

How to Defend Yourself From the Exposure?

Patching and Updates

Your company should identify internet-facing Log4j devices as soon as possible and upgrade them to version 2.15.0.

You should also install all manufacturer and vendor updates and security fixes as soon as they become available. Minecraft, for example, has already recommended users upgrade the game to avoid issues. Other open-source programs, such as Paper, are also publishing patches to address the issue.

Set Rules

Installing a Web Application Firewall is currently the greatest method of defense against Log4j (WAF). If your company already has a WAF, it’s a good idea to add Log4j-specific rules.

You can protect your apps against Log4j by identifying and blocking the harmful character strings on upstream devices such as a WAF.

Threat Hunting and Alerts

Setting up notifications for probes or attacks on machines running Log4j is recommended by the National Cybersecurity Centre (NCSC).

Request that your organization’s security operations continue to look for abnormalities on a regular basis and take action on any alerts issued by Log4j.


Log4j has taken the globe by storm, and it appears to be here to stay. It will keep the IT community busy for months to come since there is no one-size-fits-all solution for a vulnerability of this magnitude.

As things stand, security experts, defense teams, and white hat hackers are all rushing to figure out how widespread this flaw is and what it means in terms of long-term consequences.

While the situation appears to be dire at the time, end-users should still make it a priority to minimize this vulnerability by following the aforementioned suggestions and cybersecurity experts’ recommendations.

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