Another TXT Attack

Today we present a totally different attack that allows an attacker to trick the SENTER instruction into misconfiguring the VT-d engine, so that it doesn?t protect the newly loaded hypervisor or kernel. This attack exploits an implementation flaw in a SINIT AC module. This new attack also allows for full TXT circumvention, using a software-only attack. This attack doesn’t require any SMM bugs to succeed and is totally independent from the previous one.

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