We can’t guide you through it, but involved a lot of reading of Intel manuals and learning how the boot process works inside the BIOS and memory. What they had was na 500 KB file where they needed to identify the part responsible for checking the password and calculating the challenge-response scheme. Only a single byte was wrong in Sergiusz’s dump. It was repeated several dozens times to apply simple statistics to determine which bytes were right and which wrong.įirmware dumping ended on the very same day Michał finally decrypted the firmware update, so they were able to compare the results of their work. With a heat gun, custom made circuit board, a soldering iron and lots of cables he was able to start dumping the BIOS chipset.ĭumping process was far from perfect and generated lots of errors. While Michał was fighting with the updater, Sergiusz tried another approach. Fortunatelly Michał was able to find a newer 32-bit updater, reverse it and identify functions that decrypted the firmware. The updater turned out to be a 16-bit one. Unpacking it was quite easy, but the image itself looked encrypted. They did however locate a BIOS firmware update for this model on Toshiba’s website. Dumping from memory is not an option when you cannot run the OS. Geting the BIOS firmwareįirst they wanted to start with analysing BIOS firmware. He enlisted the help of his friend Michał “Redford” Kowalczyk and they started a 3-year long journey which ended with the ability to unlock any business Toshiba laptop made between 20. The owner soon gave up, but Sergiusz just couldn’t leave the old laptop alone. He did discover the service mode (Ctrl+Tab Ctrl+Enter) where a challenge is presented and a proper answer can unlock the machine when you lost the password, but he did not have the tool (most probably proprietary service tool made by Toshiba) to get the proper answer. Sergiusz tried all the clever tricks with batteries and jumpers, but none worked. It had a BIOS password set up, unknown to the current owner. Someone came to Sergiusz “q3k” Bazański asking for help in unlocking it. We’ll do our best to describe what we can, but there will be moments when we can’t even pretend to understand what was happening – please refer to the slides/Hackaday entry or try to decrypt the recorded presentation. There’s also a partial project log – in English as well. There are also slides – this time in English, from Recon 2017 – but no recording. There is a recording, published yesterday, but it’s encrypted in Polish. We had the pleasure to watch this talk live at Security PWNing conference in 2017 in Warsaw. There will be plenty of hardware hacking, reverse engineering and perseverance. Restart to enter the correct security password.” It's that laptop Identity that prospects us to the password, eventually.Luckily, Megabyte offers a pre-built answer for many (but not all) notebook bios hair.This is a great story about hacking a BIOS-level locked Toshiba laptop. Which 99% of us do not understand.After generally 3-5 attempts at the password, the laptop will react with something equivalent to “This laptop computer ABCD12345-ZYX is certainly locked. (Note to self: Perform not perform with bios whiIst drunk) All yóu need can be to know the protocol used to compute the password. SighAs is usually the situation with several electronic products, a locked bios will frequently offer an ID that - with plenty of clever reverse engineering - will disclose the complicated password that you came into then quickly did not remember. All you keep in mind is getting into a actually clever fresh security password at the time. It occurs more usually than you'm believe - access to the biós of your notebook is secured you've forgotten the damn password.
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