Download Detecting Peripheral-based Attacks on the Host Memory by Patrick Stewin PDF
By Patrick Stewin
This paintings addresses stealthy peripheral-based assaults on host desktops and provides a brand new method of detecting them. Peripherals might be considered as separate platforms that experience a committed processor and devoted runtime reminiscence to deal with their initiatives. The publication addresses the matter that peripherals regularly converse with the host through the host’s major reminiscence, storing cryptographic keys, passwords, opened documents and different delicate info within the technique – a side attackers are quickly to exploit.
Here, stealthy malicious software program in line with remoted micro-controllers is applied to behavior an assault research, the result of which offer the root for constructing a unique runtime detector. The detector unearths stealthy peripheral-based assaults at the host’s major reminiscence by means of exploiting sure houses, whereas an enduring and resource-efficient size procedure guarantees that the detector can also be in a position to detecting temporary assaults, that may differently be successful whilst the utilized procedure simply measures intermittently. Attackers take advantage of this technique by way of attacking the method in among measurements and erasing all lines of the assault earlier than the approach is measured again.
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Additional resources for Detecting Peripheral-based Attacks on the Host Memory
A serial port is emulated to implement text console redirection [see 79, Chap. 5]. Text output that is sent to this port is forwarded to a remote console via the network. With this capability an administrator can remotely control the BIOS. To implement disk redirection a local disk is emulated by the ME environment [see 79, Chap. 5]. , a CDROM with an operating system installer to recover the operating system of the AMT enabled platform) via the locally emulated disk. During the platform power-on procedure the ME firmware image is loaded into ME RAM.
The authors mention that they can copy the screen content, strings, and key material using DMA reads. Furthermore, with DMA writes, the authors can change the screen content, conduct a privilege escalation attack, and inject code into the runtime memory of the host. Boileau  also covered a FireWire-based DMA attack. The author was able to attack a Windows XP based laptop computer. In 2007, Piegdon and Pimenidis  published another FireWire related DMA attack paper. They described how to steal private SSH keys as well as to inject arbitrary code.
2 Devices Firmly Established Inside the Platform Chassis In this work we have a clear focus on stealthiness. The attacker must not need physical access to the target machine to increase the probability of stealthy infiltration. Hence, the attack devices presented in Sect. 1 are not considered by our trust and adversary model, see Sect. 7. We focus on attacks that originate from platform peripherals. This section considers DMA attacks that originate from platform peripherals such as special management controller, network interface cards, and video cards.