AsusTEK asio.sys unsafe operation

[0x3d5157636b525761 iddqd <0x3d5157636b525761 () gmail com>]

Brief
====
AsusTEK asio.sys driver accepts IOCTLs that allow the user to freely
manipulate MSRs.

Disclosure timeline
================
March 4th, 2016: contacted AsusTEK via mail and online chat. AsusTEK blamed
it on Microsoft!
March 5th, 2016: contacted the Microsoft security response center.
March 10th, 2016: Microsoft acknowledged and asked AsusTEK to fix.
March 16th, 2016: AsusTEK refuse to admit their mistakes.
March 17th, 2016: public disclosure, assigned DWF-2016-91001.

Technical details
=============
IOCTL 0xA0406458 for reading MSR values - the MSR number is sent as a
single DWORD in the input buffer, and the output value is a single QWORD in
the output buffer.
IOCTL 0xA040645C for writing MSR values - the MSR number is the first DWORD
and the value is the following QWORD in the input buffer.

POC code and blog entry
=======================
http://securitygodmode.blogspot.co.il/2016/03/bloatware-considered-harmful.html

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