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.

Origine de l’article :
http://theinvisiblethings.blogspot.com/2009/12/another-txt-attack.html