Microsemi, manufacturer of the ProASIC3 field-programmable gate array (FPGA) that researchers Sergei Skorobogatov and Christopher Woods claim has a highly hackable backdoor, has issued a statement (PDF) about the attack. The statement also casts doubt on the experimental method used to detect the backdoor, as it says the company …
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It's not Microsemi's fault
From the response PDF, it seems that Microsemi's customers can explicitly dis-able the test feature, or leave the feature working, secured by some who-knows-how-secure-it-really-is method.
If the company incorporating the ASIC into their product chooses to trust the who-knows-how-secure-it-is method of protecting access to the test feature (e.g. leaves the test feature active, but passcode-'protected'), then the fault lies with that product-maker, and not with Microsemi.