From The Register, May 16:
Intel ME and AMD PSP: The silicon layer nobody certifies
FEATURE Can digital sovereignty exist on American silicon?
Europe is pouring more than €2 billion into sovereign cloud initiatives designed to reduce exposure to US legal reach. The EU's IPCEI-CIS program funds infrastructure development. France qualifies operators under SecNumCloud, a framework with nearly 1,200 technical requirements promising "immunity from extraterritorial laws."
But most datacenters and qualified cloud operators still rely heavily on Intel or AMD processors. And inside those processors sits a computer beneath the computer: management engines operating at Ring -3, below the operating system, outside the control of host security software, persistent even when the machine appears powered off. Under the US Reforming Intelligence and Securing America Act (RISAA) 2024, hardware manufacturers count as "electronic communications service providers" subject to secret government orders.
Europe's frameworks certify the clouds. They don't assess the silicon.
The computer your OS can't see
That computer beneath the computer has a name. On Intel processors, it is the Management Engine (ME), or more precisely the Converged Security and Management Engine (CSME). On AMD, it is the Platform Security Processor (PSP). Both run at what security researchers call Ring -3, below the operating system, below the hypervisor, in a privilege level the host cannot see or log.
"It's a computer inside your computer," explains John Goodacre, Professor of Computer Architectures and former director of the UK's £200 million Digital Security by Design program. He is clear about what that means in practice. The ME has its own memory, its own clock, and its own network stack, and because it can share the host's MAC and IP addresses, any traffic it generates is indistinguishable from the host's own traffic to the firewall.
The architecture is not theoretical. Embedded in the Platform Controller Hub, the CSME is a separate microcontroller that operates independently of the host, with direct memory, device access, and network connectivity the host operating system cannot monitor. AMD's PSP works the same way.
Intel's Active Management Technology (AMT), the remote management feature the ME enables, exposes at least TCP ports 16992, 16993, 16994, and 16995 on provisioned devices. Goodacre notes that an attack surface exists on unprovisioned hardware too. These ports deliver keyboard-video-mouse redirection, storage redirection, Serial-over-LAN, and power control to administrators managing fleets of devices remotely. The capability has legitimate uses. It also provides a channel that operates at a level below what European sovereignty frameworks can attest.
Microsoft documented in 2017 that the PLATINUM nation state actor used Intel's Serial-over-LAN (SOL) as a covert exfiltration channel. SOL traffic transits the Management Engine and the NIC sideband path, delivered to the ME before the host TCP/IP stack runs. The host firewall and endpoint detection saw nothing, and any security tooling running on the compromised machine itself was equally blind. PLATINUM did not exploit a vulnerability. It exploited a feature, requiring only that AMT be enabled and credentials obtained. In documented cases, those credentials were the factory default: admin, with no password set.
Goodacre catalogues this and related scenarios in a 37-page risk assessment prepared for CISOs evaluating Intel vPro hardware connected to corporate networks. Its conclusion is blunt: connecting an untouched-ME device to corporate resources "exposes the organization to a class of compromise that defeats the host security stack in its entirety."
The ME does not stop when the machine appears to. Users recognize the symptom: a laptop powered off and stored for weeks is found, on next boot, to have a depleted battery. On modern thin and light platforms, what Microsoft documents as Modern Standby means "off" does not correspond to "all subsystems unpowered." The system-on-chip components the Management Engine runs on remain in low-power states, drawing enough to drain a 55 Wh battery over weeks, on the order of 100-200 mW continuous draw.
The implication is documented in Goodacre's risk assessment: "Whether the radio is in a Wake-on-Wireless-LAN listening state is firmware policy. On a device whose firmware has been tampered with during transit through the supply chain, the answer cannot be inferred from the visible power state." A laptop that appears off, in a bag, can associate with a hostile network the user has no knowledge of.
Professor Aurélien Francillon, a security researcher at French engineering school EURECOM, has spent years studying exactly this class of problem. Working with colleagues, he built a fully functional backdoor in hard disk drive firmware [PDF], a proof of concept demonstrating how storage devices could silently exfiltrate data through covert channels. Three months after presenting it at an academic conference, the Snowden disclosures revealed the NSA's ANT catalogue, which documented an identical capability already deployed in the field.
"The NSA were already doing it," Francillon says flatly. "Quite amazing." That background informs his assessment of the ME. "Yes, it can probably be used as a backdoor, like many other things, including BMC [baseboard management controller] and many other firmwares," he says. The question, he argues, is not whether the backdoor exists but whether operational controls make it unreachable in practice....
....MUCH MORE
Interesting in its own right and also related to the sovereign AI challenge raised by Mistral's head honcho:
FrenchTech: "Mistral AI's CEO says Europe has 2 years to stop becoming America's AI 'vassal state'"
