Log4j Vulnerability- A Giant Security Threat
Tags: apache, security, webdev
Published: 2021-12-30 13:03:19

---
title: Log4j Vulnerability- A Giant Security Threat
published: true
date: 2021-12-30 11:12:17 UTC
tags: apache, security, webdev
canonical_url: https://www.syncfusion.com/blogs/post/log4j-vulnerability-a-giant-security-threat.aspx
cover_image: https://dev-to-uploads.s3.amazonaws.com/uploads/articles/8gsln4py8ix7dvni4nzj.png
---

“ **It takes 20 years to build a reputation and few minutes of cyber-incident to ruin it.** ”

**– Stéphane Nappo, Global Head of Information Security, Société Générale**

Recently, the Log4j vulnerability issue has hit the headlines of global journals. From tech giants to budding startups, all are suffering from this cyberattack. Security breaches have been noticed in cloud systems, smart devices, and even in cryptocurrency apps that use Log4j as the logging utility.

In this blog post, we will see in detail the Log4j vulnerability, how it happens, and some mitigation measures to fix this security issue.

## Log4j—An overview

Logging is the process of recording data. Logged data helps developers easily resolve issues in any application or system. We can use the data to keep track of software apps or web services.

Apache [Log4j](https://en.wikipedia.org/wiki/Log4j "Link to the Wikipedia page for Log4j") is a Java object log management system. It is the leading open-source object log management system on the market.

## Cyberattacks

Cyberattacks are constantly evolving, getting more sophisticated, and becoming more of a threat. Nowadays, information is wealth. The major aim of cyber attackers is to hack our websites and steal information. It’s not just about financial gain either; often, it’s about making our organization suffer the consequences.

### Remote code execution

[Remote code execution](https://en.wikipedia.org/wiki/Arbitrary_code_execution "Link to the Wikipedia page for Arbitrary code execution") is a type of code injection attack in which an attacker compromises a remote computer (or a server) and executes malicious code on a target host or network. This is accomplished by exploiting a bug in the program that allows an attacker to upload or alter malicious content that will then be executed by the vulnerable app.

## Log4j vulnerability

This December, a huge number of vulnerabilities have been detected in the Log4j library and computers that use it. Attackers performed remote code execution through the insecure [Java Naming and Directive Interface (JNDI)](https://en.wikipedia.org/wiki/Java_Naming_and_Directory_Interface "Link to the Wikipedia page for Java Naming and Directory Interface") and the vulnerable features in Log4j.

There are many vulnerabilities reported in the Log4j library. Let’s see some of the significant ones.

### CVE-2021-44228

This is also known as the **Log4shell** vulnerability. It affects the Log4j versions from 2.0-beta9 to 2.14.1. It allows remote code execution and data exploitation.

### CVE-2021-45046

This affects versions from 2.0-beta9 to 2.15.0. It excludes version 2.12.2. It causes [denial of service](https://en.wikipedia.org/wiki/Denial-of-service_attack "Link to the Wikipedia page for Denial of service attack") while running vulnerable substandard configurations. Also, it bypasses the mitigation measures for the Log4shell vulnerability, executes remote code, and exposes data.

### CVE-2021-45105

This affects versions from 2.0-beta9 to 2.16.0. It leads to denial of service, like in the CVE-2021-45046 vulnerability, while using substandard configuration.

## A global threat

Log management is an almost indispensable part of any organization, app development, and web service. We know that Log4j is the most preferred logging utility. Users who are aware that they are directly using Log4j as a dependency can find solutions to the issue. But most of the vulnerabilities have been reported in the [indirect (transitive) dependencies](https://en.wikipedia.org/wiki/Transitive_dependency "Link to the Wikipedia page for Transitive dependency"). Those transitive users might not be aware of the issue. This becomes worse when these vulnerabilities pass through the dependency chain. That’s why this issue has become a global threat.

## Mitigating measures

Don’t worry, every problem has its solution. Globally, many teams, developer communities, and organizations are working hard to resolve this cyberattack. Let’s discuss some of the mitigation measures that you can follow to solve this massive security threat:

- Update to the latest Log4j version or remove the old dependency versions of Log4j as a whole.
- You can use the [open source insights](https://deps.dev/ "Link to the Open Source Insights homepage") page to check the package dependencies (including transitive) and vulnerabilities. This will help us take quick action.
- Prevention is better than a cure. So, make use of the cyberattack early warning systems ([NCSC](https://www.earlywarning.service.ncsc.gov.uk/ "Link to the NCSC early warning page"), [OpSec](https://www.opsecsecurity.com/content-digital-presence/antifraud/early-warning-system/ "Link to the OpSec early warning system page"), etc.) to safeguard yourself.
- Regularly update all your smart devices and apps, including watches and speakers. This will help you access new features and security enhancements.
- Go for alternatives like [Centreon](https://fr.wikipedia.org/wiki/Centreon "Link to the Wikipedia page for Centreon"), [Dynatrace,](https://en.wikipedia.org/wiki/Dynatrace "Link to the Wikipedia page for Dynatrace") or [LogDNA](https://en.wikipedia.org/wiki/LogDNA "Link to the Wikipedia page for LogDNA"). For more details, refer to the [Top 10 Apache log4j Alternatives & Competitors ](https://www.g2.com/products/apache-log4j/competitors/alternatives "Link to Top 10 Apache log4j Alternatives & Competitors blog")blog.
- Install firewall rules and antivirus software for all the network devices in your organization.
- Make a strict access policy by frequently updating your employees’ roles and giving access permissions to only trusted people. This will help you to safeguard yourselves against former employees who left the organization.

## Reference

For more details, refer to the [Apache Log4j Security Vulnerabilities](https://logging.apache.org/log4j/2.x/security.html "Documentation link to Apache Log4j Security Vulnerabilities") documentation.

## Conclusion

Thanks for reading! If you have some other ideas to solve this disastrous Log4j vulnerability, then please share them in the comments section below. Let’s unite together to conquer the Log4j vulnerability!

At Syncfusion, we are not using Log4j as a dependency for any of our components. So, you don’t need to worry about it when using our suites.

You can otherwise contact us through our [support forums](https://www.syncfusion.com/forums "Link to the Syncfusion support forum"), [support portal](https://support.syncfusion.com/ "Link to the Syncfusion support portal"), or [feedback portal](https://www.syncfusion.com/feedback "Link to Syncfusion Feedback Portal"). We are always happy to assist you!

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- [Shield Your ASP.NET MVC Web Applications with Content Security Policy (CSP)](https://www.syncfusion.com/blogs/post/shield-your-asp-net-mvc-web-applications-with-content-security-policy-csp.aspx "Link to Shield Your ASP.NET MVC Web Applications with Content Security Policy (CSP) blog")
- [Top 5 Best Practices for Angular App Security](https://www.syncfusion.com/blogs/post/top-5-best-practices-angular-app-security.aspx "Link to Top 5 Best Practices for Angular App Security blog")
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- [10 Best Practices to Secure ASP.NET Core MVC Web Applications](https://www.syncfusion.com/blogs/post/10-practices-secure-asp-net-core-mvc-app.aspx "Link to 10 Best Practices to Secure ASP.NET Core MVC Web Applications blog")