1.5 KiB
Executable File
ShofEL2 (and its sister exploit Fusée Gelée) is an unpatchable hardware vulnerability found in the NVIDIA Tegra X1's USB Recovery Mode (RCM). Because the flaw exists in the Read-Only Memory (Boot ROM) of the SoC, it cannot be fixed via software or firmware updates by Nintendo or NVIDIA.
The exploit allows for Unsigned Code Execution at the highest privilege level (EL3) before the operating system even begins to load.
How It Works (The Vulnerability)
The exploit leverages a heap overflow in the Tegra X1’s USB RCM stack.
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RCM Mode: The Tegra X1 enters a recovery mode designed to receive factory images via USB.
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Control Request: The attacker sends a massive
USB Control Request(Get Status) with an invalid length field. -
Buffer Overflow: The Boot ROM fails to properly validate the length of the data being requested. It copies more data than the internal buffer can hold, overflowing into the execution stack.
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Arbitrary Execution: By carefully crafting the overflow (a technique known as "smashing the stack"), the attacker overwrites the return address to point to their own payload loaded in the SoC's Internal RAM (IRAM).
[!IMPORTANT] Since the Boot ROM is "burned" into the silicon at the factory, the only way to "patch" this was for NVIDIA to release a new hardware revision (the "Mariko" / T210B01 chip found in V2 and OLED Switches).
Warning
The Above explanations is AI Generated, Learn more at : https://github.com/erdzan12/switch-fusee