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How does the xz incident impacts the average user ? #xz
(sh.itjust.works)
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this post was submitted on 31 Mar 2024
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Quick summary:
liblzma is a library for the lzma compression format. Loosely, this means it's used by various other pieces of software that need this type of compression, rather than being an application itself.
It is very widely used. It comes installed on most major Linux distributions and is used by software like openssh, one of the standard remote connection packages.
However, since it was only in the tarball, you wouldn't see it widely until debian, fedora, et al release a new version that includes the latest liblzma updates. This version hadn't been added to any of the stable release channels yet, so the typical user wouldn't have gotten it yet.
I believe this would have gone out in debian 12.6 next week, and the attacker was actively petitioning fedora maintainers to get it added to fedora 40 & 41
The interesting thing about this situation was how much effort the attacker put in to gain trust just to get to the point where they could do this, and how targeted the vulnerability seems to have been. They tried very hard to reduce the likelihood of being caught by only hitting a limited set of configurations
I'm still confused exactly what the circumstances would be where this worked as the attacker intended. Would simply having the infected liblzma version on the system create the vulnerability or does something have to happen to invoke it and then what? What's he chain of events that would have happened had this worked perfectly and gone undetected? I tried to read some of the more detailed analysis but the stuff went way over my head.
Also, what about Mac OS? Can the package create any vulnerability there if installed via homebrew as it's reported to have done in some cases? Or is that environment also not right for it to work?
Here's how it was intended to work:
This would not impact MacOS because you couldnt install the infected package, since it is only ever built for debian or RPM-based systems running systemd, using glibc and the gnu linker, and for x86-64. Unless I'm misunderstanding something, there is no way to get the compiled binaries that are infected to work on a MacOS system
Additionally, I should note that I'm not exactly an expert on this stuff; I'm just in the security space and have been reading about this as it happens, so it's possible there are errors in my understanding. But that should at least give you the gist of the attack
Thank you! I believe this is what the OP was asking, and it's definitely what I wanted to know :)
Do we know what the payload is?
Arbitrary. It could be whatever they wanted at any time. This was a full on remote code execution (RCE) exploit. And baking it into an RSA key is pretty novel
And you're welcome :)