COMMON WEAKNESS ENUMERATIONDraft

CWE-1190

DMA Device Enabled Too Early in Boot Phase

The product enables a Direct Memory Access (DMA) capable device before the security configuration settings are established, which allows an attacker to extract data from or gain privileges on the product.

Soyutlama

Base

Yapı

Simple

Sömürü İhtimali

Medium

Problemi anla

Problem nedir?

The product enables a Direct Memory Access (DMA) capable device before the security configuration settings are established, which allows an attacker to extract data from or gain privileges on the product.

Genişletilmiş açıklama

DMA is included in a number of devices because it allows data transfer between the computer and the connected device, using direct hardware access to read or write directly to main memory without any OS interaction. An attacker could exploit this to access secrets. Several virtualization-based mitigations have been introduced to thwart DMA attacks. These are usually configured/setup during boot time. However, certain IPs that are powered up before boot is complete (known as early boot IPs) may be DMA capable. Such IPs, if not trusted, could launch DMA attacks and gain access to assets that should otherwise be protected.

Kök neden

Problem nasıl ve ne zaman oluşur?

Yaşam döngüsü evresi

Architecture and Design

Risk

Başarılı sömürü neye yol açar?

Bypass Protection MechanismModify Memory

Etkilenen güvenlik alanları: Access Control

DMA devices have direct write access to main memory and due to time of attack will be able to bypass OS or Bootloader access control.

Savunma

Nasıl önlenir ve çözülür?

Architecture and Design

Mimari ve tasarım yaklaşımı

Detay
Utilize an IOMMU to orchestrate IO access from the start of the boot process.