![]() Peripherals with DMA Remapping-incompatible drivers will be blocked from starting if the peripheral was plugged in before an authorized user logs in, or while the screen is locked.Peripherals with DMA Remapping-compatible device drivers will be automatically enumerated and started.IT administrators can modify the default behavior applied to devices with DMA Remapping incompatible drivers using MDM or group policies. Peripherals with DMA Remapping compatible drivers will be automatically enumerated, started, and allowed to perform DMA to their assigned memory regions.īy default, peripherals with DMA Remapping incompatible drivers will be blocked from starting and performing DMA until an authorized user signs into the system or unlocks the screen. Windows uses the system Input/Output Memory Management Unit (IOMMU) to block external peripherals from starting and performing DMA, unless the drivers for these peripherals support memory isolation (such as DMA-remapping). How Windows protects against DMA drive-by attacks Kernel DMA Protection feature doesn't protect against DMA attacks via 1394/FireWire, PCMCIA, CardBus, or ExpressCard. For example, attackers can plug in a USB-like device while the device owner is on a break, and walk away with all the secrets on the machine, or inject a malware that allows them to have full control over the device remotely while bypassing the lock screen. This capability is the reason behind the exceptional performance of PCI devices, but it also makes them susceptible to drive-by DMA attacks.ĭrive-by DMA attacks are attacks that occur while the owner of the system isn't present and usually take just a few minutes, with simple-to-moderate attacking tools (affordable, off-the-shelf hardware and software), that don't require the disassembly of the device. These devices are DMA-capable, and can access system memory and perform read and write operations without the need for the system processor's involvement. PCIe hot plug devices such as Thunderbolt, USB4, and CFexpress allow users to attach classes of external peripherals, including graphics cards, to their devices with the plug-and-play ease of USB. Kernel Direct Memory Access (DMA) Protection is a Windows security feature that protects against external peripherals from gaining unauthorized access to memory.
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