Over two months ago, Bloomberg made quite a splash with a piece about a supply chain hack against Supermicro. According to the article, Chinese spies managed to infect Supermicro's motherboard supply chain with a tiny microchip. So far, Bloomberg sticks to the story, but not a single company or security researcher has been able to verify the existence of this spy chip.
The server motherboard maker contracted an outside investigations firm to analyze current and older-model Supermicro motherboards. In a letter to customers, Supermicro explains the review found no evidence of any malicious hardware on or in the boards:
Computer hardware maker Super Micro Computer Inc told customers on Tuesday that an outside investigations firm had found no evidence of any malicious hardware in its current or older-model motherboards.
In a letter to customers, the San Jose, California, company said it was not surprised by the result of the review it commissioned in October after a Bloomberg article reported that spies for the Chinese government had tainted Super Micro equipment to eavesdrop on its clients.
Full details at Reuters. The company that performed the review wasn't mentioned by Supermicro, but Reuters was able to dig up that it was Nardello & Co.