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Dmytro on Apple PCI-E Thunderbolt

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Dmytro on PCI-E/SMM vulnerability

Dmytro has an interesting 6-part twitter post on PCI-e security:

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PCILeech 2.0 released

https://github.com/ufrisk/pcileech

 

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PCIleech progress continues…

 

https://github.com/ufrisk/pcileech

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Attacking UEFI Runtime Services

Ulf has an informative new article (and video) about attacking UEFI Runtime Services on Linux-based systems using PCILeech:

Attackers with physical access are able to attack the firmware on many fully patched computers with DMA – Direct Memory Access. Once code execution is gained in UEFI/EFI Runtime Services it is possible to use this foothold to take control of a running Linux system. The Linux 4.8 kernel fully randomizes the physical memory location of the kernel. There is a high likelyhood that the kernel will be randomized above 4GB on computers with sufficient memory. This means that DMA attack hardware only capable of 32-bit addressing (4GB), such as PCILeech, cannot reach the Linux kernel directly. Since the EFI Runtime Services are usually located below 4GB they offer a way into Linux on high memory EFI booting systems. Please see the video below for an example of how an attack may look like. […]

Full post:

http://blog.frizk.net/2017/01/attacking-uefi-and-linux.html

 

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PCIleech -vs- Apple Mac OS X

It appears Mac OS X 10.12.2 has some firmware-related security updates, with some defense against PCILeech:

http://blog.frizk.net/2016/12/filevault-password-retrieval.html
https://github.com/ufrisk/pcileech

 macOS FileVault2 Password Retrieval

“macOS FileVault2 let attackers with physical access retrieve the password in clear text by plugging in a $300 Thunderbolt device into a locked or sleeping mac. The password may be used to unlock the mac to access everything on it. To secure your mac just update it with the December 2016 patches. Anyone including, but not limited to, your colleagues, the police, the evil maid and the thief will have full access to your data as long as they can gain physical access – unless the mac is completely shut down. If the mac is sleeping it is still vulnerable. Just stroll up to a locked mac, plug in the Thunderbolt device, force a reboot (ctrl+cmd+power) and wait for the password to be displayed in less than 30 seconds!
[…]
Recovering the password is just one of the things that are possible unless the security update is applied. Since EFI memory can be overwritten it is possible to do more evil …
[…]
December 13th: Apple released macOS 10.12.2 which contains the security update. At least for some hardware – like my MacBook Air.
[…]”

Look at recent Tweets from Xeno Kovah, he has multiple posts with information about the 10.12.2 update:

https://twitter.com/XenoKovah/

Firmware passwords:
https://support.apple.com/en-us/HT202796
https://support.apple.com/en-us/HT204455
https://support.apple.com/en-us/HT203409

I’ll admit, I didn’t find any firmwaer information in their release:
https://support.apple.com/en-us/HT207423

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