November 2017
Intermediate to advanced
452 pages
11h 46m
English
Content preview from IoT Penetration Testing Cookbook
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How to do it...
- The glitch that we will look at here is called NAND glitching, where we will short one of the I/O pins of our device's NAND flash to a GND pin. Note that this shorting has to be performed at the very moment when the bootloader has booted and the kernel is about to boot up.
Consequently, if the shorting works, the kernel will fail to boot, thus causing you to drop to the default bootloader prompt, enabling you to change the bootloader parameters.
- To give an example of what you can do with bootloader access, adding single to the boot up args will enable you to log in to the single user mode, thus bypassing the requirements of authentication on some systems. This is also shown in the following screenshot:
Image source: http://console-cowboys.blogspot.com/2013/01/swann-song-dvr-insecurity.html ...
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