Liftoff!

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A mobile client for Lemmy running on iOS and Android

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Is Liftoff safe regarding the libwebp exploit? (self.liftoff)

submitted 1 year ago by MeatAndSarcasmGuy to c/liftoff

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I recently saw an article (https://stackdiary.com/heap-buffer-overflow-in-libwebp-cve-2023-5129/) that said WEBP images could be a huge security hole right now and I know Lemmy uses a lot of WEBP images.

I'm not sure how long this has been known, so maybe the Liftoff devs already took care of it. Does anyone know if Liftoff has already made the necessary patches?

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[–] [email protected] 19 points 1 year ago (1 children)

The vulnerability is fixed within pict-rs, which is part of lemmy instance default setup. It's such a coincidence that I've just updated it on mine.

TL;DR - it is not up to liftoff to fix it.

[–] MeatAndSarcasmGuy 6 points 1 year ago

Oh that's interesting. I thought it would be through the app, since the article mentioned being patched in browsers; so that's definitely good to know.

[–] [email protected] 4 points 1 year ago (1 children)

https://blog.isosceles.com/the-webp-0day

tldr: libwebp has been patched and will eventually make its way to everyone. This is not an easy exploit and unless you're at the level of a nation state target, don't worry about it.

[–] [email protected] 1 points 1 year ago* (last edited 1 year ago)

I must disagree. The information is public and there are many sources that describe how to construct such a file that can trigger the heap buffer overflow. You don't need to understand all the theory to cause the overflow.

I don't think it's that complicated. I'm sure it will be used as an N-day for a long time.

The key to effective exploitation is learning to understand deeply only those parts that require deep understanding.