Although AMT vulnerabilities are not new, the researchers say this issue is particularly severe because it affects most Intel laptops, could enable an attacker to gain remote access for later exploitation, and is particularly easy to exploit.
The AMT attack requires physical access to the machine, but the speed at which it can be carried out makes it easily exploitable if the laptop is left unattended. It warned that "millions" of laptops may now be vulnerable to exploitation.
Intel AMT gives users remote monitoring and maintenance of laptops.
F-Secure has notified all relevant OEMs and Intel about the issue.
To mitigate this issue, organizations can adjust their settings and use a strong AMT password or disable it altogether.
Sintonen recommends that companies configure an AMT password so attackers wouldn't be able to boot via MEBx and compromise the system.
F-Secure has notified Intel, all relevant device manufacturers and the CERT-Coordination Center in the USA about the security issue.
How does the attack work?
In a usual scenario, the BIOS password prevents unauthorized users from accessing the low-level components of a device.
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At this point a hacker would be able to gain remote access to the system as long as they're able to insert themselves onto the same network segment as the victim. Alternately, disable AMT on the device. IT should also go through all now deployed machines, and organize the same procedure for them. While inspection, if a PC's AMT password is found to be already set to an unknown value, it should be treated with suspicion and appropriate steps should be taken.
Although solid operations security is the first step (don't ever leave your laptop unwatched in an insecure location!), there are some basic safeguards all IT departments should implement. It is unrelated to the recently disclosed Spectre and Meltdown vulnerabilities.
"We reached out to Intel last summer".
"We discovered the issue this summer, and since discovering it, we have found it in thousands of laptops", F-Secure told El Reg.
Intel has now made those fixes, she says.
Intel recommends that vendors require the BIOS password to provision Intel AMT.
However, as this feature comes enabled by default even on consumer devices, it has anxious privacy activists that it can be used as a backdoor or to allow attackers remote access to victims' machines. Even if you think the chance of system penetration via inappropriate local access is minimal, the solution to this problem is to not allow access to the AMT until the proper BIOS password is entered.
Sintonen stumbled upon the issue in July 2017, and notes that researcher Parth Shukla also mentioned it in a more recent talk. Shukla couldn't be immediately reached for comment on F-Secure's research and Intel's mitigation advice. A similar vulnerability has also been previously pointed out by CERT-Bund but with regards to USB provisioning, Sintonen said.
"Intel has provided recommendations to system manufacturers in September 2015 to protect the Intel MEBx with the system BIOS password", it says.
These are not the first AMT security problems to have been discovered. This is probably due to the level of access Intel AMT possesses.
AMT is no stranger to security weaknesses, with many other researchers finding multiple flaws within the system, but Sintonen's discovery surprised even him. It said the flaws were present in many PCs, servers and internet of things platforms with Intel CPUs, including all generations of Intel Core Processors, as well as some Xeon, Atom, Pentium and Celeron CPUs, amongst others.
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