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Culture War Roundup for the week of April 1, 2024

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Very much appreciate the additional takeaways.

Rolling out your own compression is much less evil: there is certainly some potential for arbitrary code execution vulnerabilities, but not more than with handling any other file parsing.

Yeah, that's fair. There are some esoteric failure modes -- how do you handle large files, what level of recoverability do you want to handle, how do you avoid being the next zlib -- but for good-enough lossless compression you can get away with some surprisingly naive approaches, without the cryptography-specific failure mode where it can look where it's working fine but be vulnerable in ways you can't even imagine.

Data point: As some casual linux user, I recognize the xz file extension.

Huh, I stand corrected. I've seen it occasionally, but more often for Docker than anything else -- a lot of environments still use .gz almost everywhere.

On the plus side, the fact that the attackers stayed in userspace instead of having /usr/bin/sshd load some kernel model seems to indicate that a stealthy compromise of the kernel is hard? Yay for NSA's SELinux?

There is that on the plus side. I'm not hugely optimistic people would be as easily able to discover those sort of attacks, but then again, there's a lot more eyes on the kernel and a lot more emphasis on finding weird or unexpected behaviors in it.

I for one do not want to scream at them because I consider them to be a sock puppet of some unknown agency. I am kind of gleeful that some agency burned through this identity they put a lot of work into propping up.

Yeah, that's probably the more Correct response.