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backdoor in upstream xz/liblzma leading to ssh server compromise
(www.openwall.com)
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this post was submitted on 29 Mar 2024
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You're right, there's more parts to it, especially social engineering. Maybe there's other ways to hide a payload, but there aren't many avenues. You have to hide the payload in a binary artefact, which are pretty suspicious when you don't do it in a (well scrutinized) cryptography lib, or a compression lib.
Then that payload has to be executed for some reason, which means you need a really good reason to embed it (e.g. something like widevine), or have to modify the build script.