The Log4j vulnerability got me thinking: Is there such a thing as too much open source?

Before anyone immediately fires off a flaming email, rage tweet or scathing blog post, hear me out for a moment. If you know me, you know that I am an open source fanatic. I’ve been asked many times, “Should we use open source software and, if so, how much?” My response was (and still is) that open source software is a massive source of innovation and I can promise you, whether or not you use it, know that your competitors certainly are!

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I could go on and on extolling the virtues of open source and how it enabled the cloud, reshaped software architectures, created new product categories and gave us valuable tools like telemetry and increased visibility into cloud-native apps, infrastructure and beyond.

When I first heard about the Log4j vulnerability on December 9, like many others, I quickly informed the tech leaders, engineers and SREs in my network about the serious potential risks such a zero-day vulnerability in the widely-used Log4j tool represented. In one way—probably the only way—the Log4j exploit shared a very important characteristic with the SolarWinds supply chain attack of late 2020: The widespread distribution and ubiquitous use of the software across applications, systems and organizations. Arguably, Log4j is used much more widely.

This similarity raised questions I hadn’t fully considered in the context of such widely used software. Can we use too much open source software? Is Log4j too prevalent in its use and, therefore, a single point of failure? How bad would the Log4j situation be if a fix wasn’t immediately available or if one wasn’t forthcoming?

The answer I kept coming back to is a resounding ‘no’. I still don’t think there’s such a thing as using too much (insert any open source project name) software. Log4j—and so many other open source software projects—are massively beneficial to us, and we virtually couldn’t function without these systems, tools and solutions in today’s age of ubiquitous software.

What the current Log4j vulnerability, recent software supply chain attacks and other cybersecurity incidents with widespread impact highlight is our need to quickly respond to security incidents and take remediation steps anywhere they are found in the software stack. And that includes open source software. High-impact security vulnerabilities can occur anywhere across the numerous software stacks and services we use, though they have even greater impact when they occur in widely-used infrastructure, reusable components and microservices.

In a world of infrastructure-as-code (IaC), it’s no longer a matter of patching a particular set of routers or servers. Unfortunately, much of the software stack is not containerized or built using smaller, easily replaceable containers and microservices—at least not yet. Our mindset and processes going forward from this incident must change, and we have to be prepared to respond to and remediate vulnerabilities both horizontally and vertically across the software stack. In certain circumstances, we have to do this on a large scale.

As is common with active open source projects, Log4j contributors responded quickly with a readily available fix. The real answer to my original question above is that few are as prepared to respond to an important security vulnerability as those incredible, hard-working, active and engaged open source software developers.