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Just about every Windows and Linux device vulnerable to new LogoFAIL firmware attack
(arstechnica.com)
this post was submitted on 07 Dec 2023
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If you have access to directly write to arbitrary disk locations you already have full control. Why bother with overwriting the logo file with a malicious payload if you can just overwrite the actual kernel...
Because this can persist beyond an OS rebuild or patch. You infect the BIOS and you're on the device until the BIOS is free reflashed. And who ever does that?
Or until you overwrite that malicious logo again?
No. The logo is loaded, runs in BIOS context and is able to modify the BIOS. Now it's embedded and the logo is irrelevant.
Due to Secure Boot (if it actually enabled since there are some bogous implementations) this can be prevented. If I understand it correctly, LogoFAIL bypasses this security measure and enables loading unsigned code.
This is what I'm wondering