> CVE-2021-37107: Huawei Peripheral DMA Memory Access Permission Bypass

Summary Last year we published research at Black Hat in which we disclosed multiple vulnerabilities in Huawei Kirin SoC’s DDR Controller (DMSS) Access Permission system which allowed some SoC cores or DMA-capable peripherals to directly access secure world memory and completely compromise the entire memory of the SoC. This advisory focuses on a new access permission vulnerability in the same DMSS. The vulnerability can be used to entirely compromise the Trusted Execution Environment from the Baseband. The vulnerability was fixed in February 2022. Vulnerability Details The peripheral DMA lives up to its name, as it is mainly used to interact between multiple communication peripherals (e.