this post was submitted on 30 Mar 2024
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100%.
In many ways, distributed open source software gives more social attack surfaces, because the system itself is designed to be distributed where a lot of people each handle a different responsibility. Almost every open source license includes an explicit disclaimer of a warranty, with some language that says something like this:
Well, bring together enough dependencies, and you'll see that certain widely distributed software packages depend on the trust of dozens, if not hundreds, of independent maintainers.
This particular xz vulnerability seems to have affected systemd and sshd, using what was a socially engineered attack on a weak point in the entire dependency chain. And this particular type of social engineering (maintainer burnout, looking for a volunteer to take over) seems to fit more directly into open source culture than closed source/corporate development culture.
In the closed source world, there might be fewer places to probe for a weak link (socially or technically), which makes certain types of attacks more difficult. In other words, it might truly be the case that closed source software is less vulnerable to certain types of attacks, even if detection/audit/mitigation of those types of attacks is harder for closed source.
It's a tradeoff, not a free lunch. I still generally trust open source stuff more, but let's not pretend it's literally better in every way.
There are two big problems with the point that you're trying to make:
There are many open source projects being run by organizations with as much (often stronger) governance over commit access as a private corporation would have over its closed source code base. The most widely used projects tend to fall under this category, like Linux, React, Angular, Go, JavaScript, and innumerable others. Governance models for a project are a very reasonable thing to consider when deciding whether to use a dependency for your application or library. There's a fair argument to be made that the governance model of this xz project should have been flagged sooner, and hopefully this incident will help stir broader awareness for that. But unlike a closed source code base, you can actually know the governance model and commit access model of open source software. When it comes to closed source software you don't know anything about the company's hiring practices, background checks, what access they might provide to outsourced agents from other countries who may be compromised, etc.
You're assuming that 100% of the source code used in a closed source project was developed by that company and according to the company's governance model, which you assume is a good one. In reality BSD/MIT licensed (and illegally GPL licensed) open source software is being shoved into closed source code bases all the time. The difference with closed source software is that you have no way of knowing that this is the case. For all you know some intern already shoved a compromised xz into some closed source software that you're using, and since that intern is gone now it will be years before anyone in the company notices that their software has a well known backdoor sitting in it.