So, does this affect dual boot systems, if e.g. Windows is compromised, now that malware in the efi partition can compromise the Linux system next time it boots? Yikes!
I suppose in principle malware from one OS can attack the other anyway, even if the other is fully encrypted and/or the first OS doesn’t have drivers for the second’s filesystems: because malware can install said drivers and attack at least the bootloader - though that night have been protected by secure boot if it weren’t for this new exploit?
Yes, it can execute code regardless of OS installed because it persists on the Mainboard and loads before any OS, making it possible to inject code into any OS.
Is this potentially useful to me? Since it is persistent, can I use it on this motherboard I have over here that insists on using UEFI even if I do not want to?
So I don’t get it, I have my entire boot image in a signed EFI binary, the logo is in there as well. I don’t think I’m susceptible to this, right? I don’t think systemd-boot or the kernel reads an unsigned logo file anywhere. (Using secure boot)
Depending on how the UEFI is configured, a simple copy/paste command, executed either by the malicious image or with physical access, is in many cases all that’s required to place the malicious image into what’s known as the ESP, short for EFI System Partition, a region of the hard drive that stores boot loaders, kernel images, and any device drivers, system utilities, or other data files needed before the main OS loads.
Right, I know EFI images are stored in the EFI partition, but with secure boot, only signed images can be executed, so they’d need to steal someone’s signing key to do this.
I actually am in the market for a new mobo and cpu.
Are there any mobo’s nowdays that don’t use UEFI? I just want an old traditional style BIOS with a jumper to restore it from a ROM chip if I get any malware, so I can actually trust my hardware.
I did force myself to deal with UEFI for the sake of windows, but gaming has gotten good enough on Linux, I don’t actually need to dual boot windows anymore.
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