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Deguard: turning a T480 into a coreboot laptop (10-min talk + live demo)

published on 2025-05-29 10:25:23 UTC by /u/3mdeb
Content:

Intel BootGuard has kept most Skylake/Kaby-Lake/Coffee-Lake laptops locked away from coreboot – until now.

At the end of 2024, Ubuntu developer Mate Kukri introduced deguard, a small utility that leverages CVE-2017-5705 inside ME 11.x to disable BootGuard fuses in SRAM. The result: previously “un-coreboot-able” machines – e.g. Lenovo T480/T480s and Dell OptiPlex 3050 – can boot unsigned firmware again. It has been presented and discussed at the Dasharo Developers vPub 0xE, you can watch the presentation and look through the slides below.

🔹 What deguard does

  • "Downgrades ME via SPI flash overwrite"
  • "Patches BootGuard fuses on-the-fly"
  • "Lets you sign nothing at all – coreboot just runs"

🔹 Why it matters

  • "Opens the door for community coreboot ports on 8th-gen Intel laptops"
  • "Gives Libreboot & vendors like NovaCustom a path to newer hardware"
  • "Great teaching example of how not to design a root-of-trust"

10-min talk + live demo video / slides (free):
https://cfp.3mdeb.com/developers-vpub-0xe-2025/talk/WVJFQD/

Slides direct PDF: https://dl.3mdeb.com/dasharo/dug/9/7.introduction-to-deguard.pdf

Happy to answer questions, share flashing notes, or compare against other BootGuard work-arounds.

submitted by /u/3mdeb
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Article: Deguard: turning a T480 into a coreboot laptop (10-min talk + live demo) - published 5 months ago.

https://www.reddit.com/r/netsec/comments/1ky7bng/deguard_turning_a_t480_into_a_coreboot_laptop/   
Published: 2025 05 29 10:25:23
Received: 2025 05 29 10:43:48
Feed: /r/netsec - Information Security News and Discussion
Source: /r/netsec - Information Security News and Discussion
Category: Cyber Security
Topic: Cyber Security
Views: 13

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