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CVE-2024-6387: RCE in OpenSSH's server, on glibc-based Linux systems (seclists.org)
submitted 2 months ago by 0x0@programming.dev to c/security@programming.dev
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Regression in signal handler.

This vulnerability is exploitable remotely on glibc-based Linux systems, where syslog() itself calls async-signal-unsafe functions (for example, malloc() and free()): an unauthenticated remote code execution as root, because it affects sshd's privileged code, which is not sandboxed and runs with full privileges.

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[-] refalo@programming.dev -1 points 2 months ago

I don't get it... wouldn't everything < 9.8p1 already include <= 8.5p1? So why is it even necessary to mention?

[-] rushaction@programming.dev 4 points 2 months ago

Because this is a regression and this particular issue was introduced in 8.5p1. So it only affects versions newer than that, up until when it was fixed in 9.8p1.

[-] towerful@programming.dev 1 points 2 months ago

For an integer, 4 < x < 6 x has to be 5. It's the only value that satisfies all sides of the equation.
You are deriving a set of values for open ssh that satisfies all sides of the equation.

I think it's more of a mathematical representation than programming representation (I mean, I don't know of a language that would accept that syntax).
Certainly psuedocode would have quick statements like this

[-] refalo@programming.dev 2 points 2 months ago

seems to work fine in C and I can find quite a bit of examples of it being used actually

[-] towerful@programming.dev 1 points 2 months ago

Oh, I can't find any examples. What are you searching for?
The closest I can find is an old hlsl offhand comment showing the syntax in isolation, but no example.
https://stackoverflow.com/a/29689866

this post was submitted on 01 Jul 2024
31 points (97.0% liked)

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