An anonymous reader quotes a report from Ars Technica: A newly published "exploit chain" for Nvidia Tegra X1-based systems seems to describe an apparently unpatchable method for running arbitrary code on all currently available Nintendo Switch consoles. Hardware hacker Katherine Temkin and the hacking team at ReSwitched released an extensive outline of what they're calling the Fusee Gelee coldboot vulnerability earlier today, alongside a proof-of-concept payload that can be used on the Switch. "Fusee Gelee isn't a perfect, 'holy grail' Exploit -- though in some cases it can be pretty damned close," Temkin writes in an accompanying FAQ. The exploit, as outlined, makes use of a vulnerability inherent in the Tegra X1's USB recovery mode, circumventing the lock-out operations that would usually protect the chip's crucial bootROM. By sending a bad "length" argument to an improperly coded USB control procedure at the right point, the user can force the system to "request up to 65,535 bytes per control request." That data easily overflows a crucial direct memory access (DMA) buffer in the bootROM, in turn allowing data to be copied into the protected application stack and giving the attacker the ability to run arbitrary code. The exploit can't be fixed via a downloadable patch because the flawed bootROM can't be modified once the Tegra chip leaves the factory. As Temkin writes, "unfortunately, access to the fuses needed to configure the device's ipatches was blocked when the ODM_PRODUCTION fuse was burned, so no bootROM update is possible. It is suggested that consumers be made aware of the situation so they can move to other devices, where possible." Ars notes that Nintendo may however be able to detect "hacked" systems when they sign on to Nintendo's servers. "The company could then ban those systems from using the Switch's online functions."
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