AsusTEK asio.sys MSR Manipulation
Posted on 30 November -0001
<HTML><HEAD><TITLE>AsusTEK asio.sys MSR Manipulation</TITLE><META http-equiv="Content-Type" content="text/html; charset=utf-8"></HEAD><BODY>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 </BODY></HTML>
