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Apple iMac EFI To accompany the Apple iMac EFI talk, we are also releasing a technical paper that goes into greater detail covering the data we collected during our analysis. This blog post summarizes some of the main areas of the research and interesting things we found during our analysis and acts as an accessible introduction to the technical paper which can be downloaded from the link below.

SOLVED: EFI ROM corruption on - iMac Intel 24" EMC - iFixit

Over the last few months, Duo Labs has been working on a project researching Apple iMac EFI difference in security support provided by vendors to the firmware in their systems as compared to the software. The term firmware covers a wide range of things in a modern system, so for the sake of Apple iMac EFI study, we focused on looking at the security support given to EFI firmware.

EFI is the pre-boot environment that Apple iMac EFI, by and large, replaced the Apple iMac EFI BIOS environment that had been common since the mid to late s. In a modern system, the EFI environment holds particular fascination for security researchers and attackers due to the level of privilege it affords if compromise is successful.

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Apple iMac EFI is often talked about as operating at privilege level ring -2 a great quick explanation of protection rings below 0 is herewhich indicates it is operating at a lower level than both the OS ring 0 and hypervisors ring In a nutshell, this means that attacking at the EFI layer means that you exert control of a system at a level that allows you to circumvent security controls put in place at higher levels, including the security mechanisms of the OS and applications. Our research focused on the Apple Mac ecosystem as Apple is in a somewhat unique position of controlling the full stack from hardware, through firmware, OS, and all the Apple iMac EFI up to application software and can be considered widely deployed.

This single stakeholder ecosystem made the job of gathering and analyzing relevant data for our research quite a bit simpler, however, we are of the belief that the main issues we have discovered are generally relevant across all vendors tasked with securing EFI firmware and are not solely Apple.

What Did We Analyze? Our analysis is based upon the comparison of two Apple iMac EFI built during the first stage of the research work. Hardware and firmware components that must be supported to run an operating system on Apple-Intel hardware include the Extensible Firmware Interface.

Booting[ edit ] To Mac operating systems[ edit ] Intel Macs can boot in two ways: For multibootingholding down "Option" gives a choice of bootable devices, while the rEFInd bootloader is commonly used for added configurability. To non-Mac operating systems[ edit ] Main article: Improve the reliability of Back to My Mac Resolve an issue when transferring files to certain SMB servers Address various minor Mac App Store bugs Address minor FaceTime Apple iMac EFI issues Address issues with graphics stability and 3D performance Improve external display compatibility Improve Thunderbolt device support Apple iMac EFI, be sure to install this update before you apply the EFI firmware update for these iMac systems.

As always, be sure to back up your Apple iMac EFI before applying these updates, and for the EFI updates, be sure to follow the onscreen instructions. The EFI updates will download to your system and require a restart, where you will see a gray progress bar while the update is being applied.

The system may reboot a couple of times during this process, so be sure to allow it to fully complete and load the operating system. While it is being updated, be sure to have the system plugged into a working power source Apple iMac EFI all times do not rely on the battery power during this update. The software updates non-EFI will just require a single restart and will not show a progress bar when being applied.


iMac EFI Firmware Update iMac EFI Firmware Update iMac EFI Firmware Update iMac EFI Firmware Update inch iMac EFI FW Update iMac EFI Firmware Update Email Download Link. This update fixes several issues to improve the stability of iMac (Mid ) computers.

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