Photo by Karsten Winegeart on Unsplash

Secure Just by Being in a Cave?

Security of OSS — Fluid Attacks as a vivid example

By Felipe Ruiz | November 05, 2020

In two posts I published previously, I had already mentioned Open Source Software (OSS). In the first one, I remember quoting Dale Gardner, referring to the increasing use of OSS by development teams in charge of building applications. In the second one, which may serve as an introduction to the post you are currently reading, I addressed some generalities about OSS, its differentiation from proprietary software, and some of its benefits as a business strategy. For this post, we have decided to give more room to the security of OSS and briefly present our experience at Fluid Attacks.

About two months ago, Nivel4 reported that the source codes of three Mexican banks' mobile applications had been leaked and revealed on the web. Some people on the networks commented that the cause of the leak was a misconfiguration, and the banks immediately reported that there was no impact on the security of the systems and customers' sensitive data. Was it true? I believe that many people were suspicious of such security on the spot. By the way, if there was nothing to lose by showing the code, why did they keep it out of sight? These banks undoubtedly lost users' confidence and reputation among competitors.

The applications of the three banks inadvertently became OSS. We could say that their owners intended to maintain a security image by not making public the code. However, hidden or open, the code’s security will depend on how solid and qualified its elaboration has been. Vulnerabilities or flaws can be found in both open and proprietary software, but as Bruce Byfield shared some years ago, "proprietary software vendors are notorious for security by obscurity." They usually erroneously believe that keeping their systems in the dark caves will make them more secure. Therefore, in many cases, they perform a few security assessments and patch vulnerabilities relatively slowly.

One of the most mentioned business benefits of OSS is, contrary to many people’s intuition, security. When we talk about an OSS project widely recognized on the web, we can say that many eyes are scrutinizing it and many hands are testing it regularly. Consequently, the chances of overlooking cybersecurity risks are much lower than when the project is private. A large community with a wide variety of members can detect and fix flaws and vulnerabilities in the code much faster, before any attack, than a small group of developers belonging to a single company.

Nevertheless, I should note that many companies keep their code secret, some of them at the same time pretty well secured, for no other reason than to preserve as their own the idea that makes them unique against their competitors. That is comprehensible. However, some hide only their 'essential' portions of code and expose the rest on the web to benefit from working in open communities. That is what, according to Yevgeniy Brikman, for example, Google does with their "primary differentiator[:] their search architecture." Meanwhile, many companies that share ALL the code to the general public, generating confidence by the security they provide, can receive income through other means, including offering services related to their OSS. They have their "secret sauce" located elsewhere, and here is where Fluid Attacks comes in.

Fluid Attacks is safe, out of the cave

Karsten
Figure 1. Photo by Karsten Winegeart on Unsplash

Fluid Attacks was born directly in the free and open-source software, making use of it and keeping it in that condition. As Mauricio Gomez, co-founder of the company, said, they started working directly on Linux and were in charge of networking, based on OSS, before becoming a Red Team in 2008, which has not stopped sharing its code. Code that is not exclusively adhered to a pair of privileged minds on which it will always depend to exist and operate. Whenever someone leaves Fluid Attacks, someone else with similar skills and experience will take over because the raw material with which we work will never cease to be shared.

Apart from the collaboration that we can receive from smart people of our community and not legally affiliated with our company, almost all Fluid Attacks' members can and are encouraged to review the code to propose new ideas for its optimization (including security). Since Fluid Attacks’s inception, we have taken advantage of OSS as an organization, and we have also committed ourselves, on a reciprocal basis, to generate our contribution to the overall cybersecurity community.

Could then someone ask us, aren’t you giving away work that has cost you so much? Aren’t your competitors watching in detail, even copying, what you use to serve your customers? Couldn’t keeping an OSS mean giving away the necessary material to other groups of individuals to establish new companies and more competition for you? And, perhaps more importantly, aren’t you highly vulnerable to malicious hackers' attacks by exposing your code?

In response to these questions, we can say that what we have built so far has also been partly thanks to many people worldwide who have maintained the OSS movement. We can also say that we feel comfortable making knowledge public, gaining experience and reducing duplication of effort. Additionally, we rely on our primary differentiator —which is not in the code— to stand out from old and new competitors. (They cannot be depending on us to evolve.) As I said, our way of making profits is not focused on offering a code but services from human intelligence using that code. Finally, revealing our code does not make us highly vulnerable to attacks, as long as it has the necessary security controls and its vulnerabilities are reduced to a minimum.

It is imperative to note that the code we publicly display is not just the same code we use in our clients' security benefits. It is also the code that serves to carry out our systems' and products' security analyses on an ongoing basis (Continuous Hacking). We are not giving the community a batch of mediocre and half-baked lines of code. The material we develop and fervently update at an accelerated pace is our analysts' material day by day. At the same time, it is the stuff that can be used reliably by anyone in any corner of the planet to detect vulnerabilities in IT systems.

At Fluid Attacks, we understand that having a hidden code is not necessarily keeping it safe. We comprehend that security depends on the code’s strength and quality, which preferably should be reviewed by many people and continuously. So, we do not hide the code. There’s no mystery behind what it can do. What we keep hidden and safe is our company’s and clients' sensitive data, using complex encryption processes, for example. That is what we help many companies to achieve (discovering vulnerabilities and promoting better development practices) and what we give to you as a recommendation through this post.

Inside or outside the cave, your security will depend on your armor, weapons and skills. We can help you, and the community can help you improve your security. Leave the cave voluntarily (do not wait to be taken out like the banks). It will reflect confidence, strength and transparency to your followers, clients or stakeholders. Later, you’ll even be able to generate, facilitate contributions to the community. Just contact us!

P.S. Have a look at our code, gitlab.com/fluidattacks. Check it now!

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