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Security | DMA | Hacking

Wednesday, January 11, 2017. Attacking UEFI Runtime Services and Linux. 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. 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. The EF...

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Wednesday, January 11, 2017. Attacking UEFI Runtime Services and Linux. 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. 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. The EF...

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Security | DMA | Hacking | blog.frizk.net Reviews

https://blog.frizk.net

Wednesday, January 11, 2017. Attacking UEFI Runtime Services and Linux. 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. 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. The EF...

INTERNAL PAGES

blog.frizk.net

1

Security | DMA | Hacking: Disable Virtualization Based Security (VBS) on auto-booting systems

http://blog.frizk.net/2016/11/disable-virtualization-based-security.html

Monday, November 14, 2016. Disable Virtualization Based Security (VBS) on auto-booting systems. I this post I will show how it's possible to disable Windows 10 Virtualization Based Security (VBS), Credential and Device Guard, by corrupting in-memory structures prior to operating system boot. Intel NUC Skull Canyon with a Skylake i7 CPU. 32GB RAM. M.2 SSD. Windows 10 Enterprise version 1607. The second option is to use one of the M.2 slots inside the NUC. M.2 is pretty much just another from f...Windows 1...

2

Security | DMA | Hacking: November 2016

http://blog.frizk.net/2016_11_01_archive.html

Wednesday, November 23, 2016. Windows 10 KASLR Recovery with TSX. It is possible to break Kernel Address Space Layout Randomization (KASLR) on modern operating systems running on modern x86 CPU's. It has been known since at least 2014 that timing attacks against KASLR, using TSX, is possible. This was discussed by Rafal Wojtczuk from Bromium Labs in the blog post TSX improves timing attacks against KASLR. Is found on the Black Hat site. Example code for Linux. Was published on Github after the talk.

3

Security | DMA | Hacking: January 2017

http://blog.frizk.net/2017_01_01_archive.html

Wednesday, January 11, 2017. Attacking UEFI Runtime Services and Linux. 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. 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. The EF...

4

Security | DMA | Hacking: Windows 10 KASLR Recovery with TSX

http://blog.frizk.net/2016/11/windows-10-kaslr-recovery-with-tsx.html

Wednesday, November 23, 2016. Windows 10 KASLR Recovery with TSX. It is possible to break Kernel Address Space Layout Randomization (KASLR) on modern operating systems running on modern x86 CPU's. It has been known since at least 2014 that timing attacks against KASLR, using TSX, is possible. This was discussed by Rafal Wojtczuk from Bromium Labs in the blog post TSX improves timing attacks against KASLR. Is found on the Black Hat site. Example code for Linux. Was published on Github after the talk.

5

Security | DMA | Hacking: macOS FileVault2 Password Retrieval

http://blog.frizk.net/2016/12/filevault-password-retrieval.html

Thursday, December 15, 2016. 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. Check out the demo video below:. How is this possible? At the very core of this issue there are two separate issues. The second issue is that the ...

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Security | DMA | Hacking

Wednesday, January 11, 2017. Attacking UEFI Runtime Services and Linux. 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. 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. The EF...

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