Today, this is no longer the case with hot plug PCIe ports (for example, Thunderbolt™ and CFexpress). These devices have historically existed only inside the PC chassis, either connected as a card or soldered on the motherboard.Īccess to these devices required the user to turn off power to the system and disassemble the chassis. The DMA capability is what makes PCI devices the highest performing devices available today. PCI devices are DMA-capable, which allows them to read and write to system memory at will, without having to engage the system processor in these operations. This feature doesn't protect against DMA attacks via 1394/FireWire, PCMCIA, CardBus, ExpressCard, and so on. In Windows 10 version 1903, Microsoft expanded the Kernel DMA Protection support to cover internal PCIe ports (for example, M.2 slots)ĭrive-by DMA attacks can lead to disclosure of sensitive information residing on a PC, or even injection of malware that allows attackers to bypass the lock screen or control PCs remotely. In Windows 10 version 1803, Microsoft introduced a new feature called Kernel DMA Protection to protect PCs against drive-by Direct Memory Access (DMA) attacks using PCI hot plug devices connected to externally accessible PCIe ports (for example, Thunderbolt™ 3 ports and CFexpress).
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