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Rooter ,

Lol, Tom's hardware is allowed on lemmy? It's like the fox news of the tech world.

Clickbait as usual.

VampyreOfNazareth ,

Them government backdoors. Mkay trust us mkay

Overgrowngoblin ,

Hi this is BitLockPickingLawyer here and today we'll see how secure . . .

neutron ,

A click out of one... two is binding...

chairman ,

Question: if I have an bitlocker encrypted SSD in a modern computer with embedded TPM, can I move this SSD to an old computer with external TPM to sniff the cod this way? Be gentle. I am dumb. Thanks.

jmfwnsfw ,

Not unless you entered your recovery code to unlock it on the old computer with the external tpm.

Bitflip ,

Nope. As soon as you move the disk to your second system/TPM, you lose any ability to decrypt it at all.

baseless_discourse ,

unless you have the key?

Bitflip ,

The key is inside the TPM.

baseless_discourse ,

For LUKS user set the key; for bitlocker, I believe the key is automatically uploaded to either your Microsoft account or you system admin's account.

Bitflip ,

Sure LUKS will do what you tell it. Bitlocker will do what it wants and just use the TPM unless you jump through a bunch of group policy edits and such. But you are correct, I had forgotten it does give you the option to backup the key to a txt file during the installation or initial encryption process :)

SleepingTower ,

"Sniff the cod" This is a typo right? I don't know any better, but I had a good laugh.

chairman ,

What about the salmon and the halibut? :-D

Neon ,

The Key is stored on the Internal TPM. Only it can unlock the SSD.

fmstrat ,

Say it with me now: LUUUUUKS

HelloHotel ,

I wondered why LUUUUUKS didnt use the TPM, why do i have to put my password in... this is absolutely why.

Edit: fixed spelling of LUUUUUKS

cooopsspace ,

Also yes you can, I wouldn't recommend it though. Maybe in addition to your password though.

Wait until you see Dracut and Tang.

mlaga97 ,

What exactly is the point of full disk encryption if the system auto-unlocks on boot?

rambling_lunatic ,

Protection against tampering, maybe?

Bad excuse, but that is the logic I've heard.

baseless_discourse , (edited )

LUKS is still vulnerable to this attack if you enable autodecrypt using TPM. This attack is based on the vulnerability that the CPU and TPM communicates uses plain text. And it is a pretty common attack against TPM:

https://dolosgroup.io/blog/2021/7/9/from-stolen-laptop-to-inside-the-company-network

SPI is a communication protocol for embedded systems and is extremely common amongst virtually all hardware. Due to its simplicity, there is no encryption option for SPI. Any encryption must be handled by the devices themselves. At the time of this writing BitLocker does not utilize any encrypted communication features of the TPM 2.0 standard, which means any data coming out of the TPM is coming out in plaintext, including the decryption key for Windows

And apparently Linux is not doing too hot on this regard either:

https://www.secura.com/blog/tpm-sniffing-attacks-against-non-bitlocker-targets

As we can see, parameter encryption simply isn't used in practice, and except for safeboot none of the solutions enforce PIN/MFA by default.

However, this attack is not viable for device with firmware based solution, like fTPM, Microsoft Pluton, secure enclave etc. in these case TPM is part of the cpu, hence have no exposed pins to sniff their connection.

So if you don't want people with physical access to your computer (a thief or a evil maiden) to access everything on your disk, don't setup TPM auto decrypt.

phoenixz ,

CPU communicates with TPM in plaintext

Because of course

Eufalconimorph ,

CPU doesn't have any secure storage, so it can't encrypt or authenticate comms to the TPM. The on-CPU fTPMs are the solution, the CPU then has the secure storage.

baseless_discourse ,

That make sense, CPU has no place to store private keys, since that is the functionality of TPM...

Unless there is a firmware solution, which defeats the purpose of a standalone tpm.

massive_bereavement ,
@massive_bereavement@kbin.social avatar

It seems to me an evolution on this attack: https://arstechnica.com/gadgets/2021/08/how-to-go-from-stolen-pc-to-network-intrusion-in-30-minutes/

peopleproblems ,

Very end of the article explains you need access to the TPM communication hardware, which no longer occurs external to Intel and And cpus

massive_bereavement ,
@massive_bereavement@kbin.social avatar

To *newer Intel and AMD cpus and only certain models.

There's a lot of current hardware that uses embedded TPMs. It also depends on the communication path between the CPU and the module, but chances are it will be clear text and in some, via LPC.

Rooter ,

*pretty much all AMD and Intel cpus made after 2015, not sure how a decade is new.

SpaceMan9000 ,

Should be noted that if a password is asked to decrypt the drive it also doesn't work.

amenotef ,
@amenotef@lemmy.world avatar

So offline (external) bitlocker drives that are unlocked with the key only.

Or internal bitlocker drives that are unlocked with AMD fTPM are excluded from this exploit?

Petter1 ,

Finally, we can install Linux on your corporate pc or grab some RAM from it 😂😂😂

tias ,

I thought the point of the TPM was that the keys would be kept internally to the TPM at all times and that any data lanes would only be used for transferring payload. Why are they sending keys between the TPM and the CPU?

Squire1039 ,
@Squire1039@lemm.ee avatar

There are some functions like that, like Passkey signing. For Bitlocker, the encryption/decryption key is transferred to the CPU (and RAM) in order for it to operate. The problem described here has been around for a while, but putting it on a key like that makes the attack method available to "everyone". There has been a solution for a while too: 1) put in pre-boot Bitlocker PIN, and 2) use integrated TPM like the article mentions.

smileyhead ,

Solution: Just encrypt it with a password.

BaroqueInMind ,
@BaroqueInMind@kbin.social avatar

Bit locker is a password controlled drive encryption. Am I being dumb or are you seriously saying that?

Kraven_the_Hunter ,

Yes.

tias , (edited )

I guess they mean use the password as part of the encryption key, or encrypt the key with the password. Bitlocker doesn't use the user's password in that way, which is why it can boot an encrypted system without user interaction. That part always seemed very sketchy to me.

d3Xt3r ,

FYI: You can set it to require a PIN + TPM, or even just a password eg using manage-bde -on c: -password.

https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/manage-bde-on

tias ,

Thanks, that sounds really useful. I'm guessing it won't work unless you're local admin though.

d3Xt3r ,

Yep, you'll need local admin of course.

tias , (edited )

Which kind of makes it useless in many corporate environments where it's most needed, since the users won't be able to set their own password.

d3Xt3r ,

I mean, if it's a corporate device then it's really a policy IT should be setting - this can be easily be done via a GPO or Intune policy, where an elevated script can prompt the end-user for a password.

LifeInMultipleChoice ,

Yarp. And when they forget it we use the 48 numerical recovery key found using the recovery ID that shows on the screen when you hit escape (from the bitlocker screen)

lud ,

It would be insane to let non admin change settings like this.

tias ,

I'm talking about letting the user change their own password. I'm honestly not sure how that would be technically accomplished in this situation without having to contact IT each time. It seems like something Microsoft should provide a no-frills GUI for that doesn't require elevation.

lud ,

Yeah, that could be neat as long as they still add a recovery key to the AD or somewhere else. A problem with that is that the users will likely choose shit passwords. That could be mitigated with password rules but still

I suspect Microsoft wants you to use TMP or physical keys instead of passwords.

CyberSeeker ,

When using an external TPM. Which next to no one does.

Shadow ,
@Shadow@lemmy.ca avatar

Watch the video. It just means external to the CPU, not an external device.

They demo the attack on a Lenovo laptop in the first minute of the video.

Edit: nm I just realized that was a 10 year old laptop and they're in all the modern procs. I'm a lot less impressed now.

Sounds like intel has external and amd internal with their ftpm?

Lazarus ,

Many systems still use discrete tpms. Just because the CPU has a virtual tpm function doesn’t mean it’s used

throws_lemy OP ,
@throws_lemy@lemmy.nz avatar

fTPM has a bug, don't know if it's fixed

https://www.techspot.com/news/93684-amd-promises-fix-ftpm-issue-causes-stuttering-freezes.html

Veracrypt also doesn't recommend using encryption that relies on TPMs

Some encryption programs use TPM to prevent attacks. Will VeraCrypt use it too?
No. Those programs use TPM to protect against attacks that require the attacker to have administrator privileges, or physical access to the computer, and the attacker needs you to use the computer after such an access. However, if any of these conditions is met, it is actually impossible to secure the computer (see below) and, therefore, you must stop using it (instead of relying on TPM).

If the attacker has administrator privileges, he can, for example, reset the TPM, capture the content of RAM (containing master keys) or content of files stored on mounted VeraCrypt volumes (decrypted on the fly), which can then be sent to the attacker over the Internet or saved to an unencrypted local drive (from which the attacker might be able to read it later, when he gains physical access to the computer).

https://veracrypt.eu/en/FAQ.html

Let's assume the attackers were law enforcers

__ghost__ ,

This has been fixed for a while now

Shurimal ,

The MSI mini-PC-s for office/business use have separate TPM modules on their mobos. I wouldn't be surprised if other mfg-s do this too.

Toes ,
@Toes@ani.social avatar

It's fairly common in business devices before 8th gen Intel.

MagneticFusion ,

[Thread, post or comment was deleted by the author]

    •
    Shadow ,
    @Shadow@lemmy.ca avatar

    You're being downvoted because this is a hardware problem and not Microsoft's fault.

    Just look at the Xbox one mod chip scene and you'll see MS can do security perfectly well.

    parpol ,

    Microsoft does enforce using TPM since win11 though.

    brbposting ,

    Don’t know anything about that scene, has it ever been cracked?

    Shadow ,
    @Shadow@lemmy.ca avatar

    Nope. Never. It's pretty impressive.

    mp3 ,
    @mp3@lemmy.ca avatar

    IIRC AMD is inplementing it in their Ryzen 6000 CPUs.

    PM_Your_Nudes_Please ,

    Not the Xbox One. The 360 had some wild mod chips back in the day, which actually required drilling into the CPU at a specific spot to cut some internal contacts. Basically, the 360 used a physical connection between two pins on the CPU for security. So the modchip required drilling into the CPU, to sever that connection and allow the modchip to inject its own code instead. That’s when MS (mostly) realized that relying on physical connections for security was a bad idea, because an end user has physical access to the device.

    refurbishedrefurbisher ,

    Yeah. I hate Microsoft as a company, and I hate how they inject advertising, inconsistent design, no good centralixed package manager (TBF, they're fixing that with winget, but only kind of; not sure if there's a way to add additional repositories), etc.

    But they do have damn good security. After the OG Xbox became the legendary homebrew console that it did, Microsoft beefed up security massively with the Xbox 360's software. What they didn't do quite as well was beef up hardware security, although the last model of the Xbox 360 (Winchester) has yet to be hacked. The JTAG hack was patched with a firmware update, but then it was found that through a timed glitching attack, you could force memcmp to return true, and if the timing is off, you can reboot the console via glitcher chip or SMC if using RGH 3 and try again.

    With the Xbox One, there was a priviledge escillation bug in Dev Mode that to this day has been pretty underutilized, but other than that, it's been fairly rock solid. There is another point to why, though. Microsoft realised the power of homebrew, especially after Sony made the mistake of removing OtherOS from all PS3 models, and then it got hacked shortly after. So they included (sold you) a way to run UWP apps using a sandboxed environment called Dev Mode. This leaves less of a desire for hackers to attempt exploiting the console's retail mode, since they have almost the same resources that games have (still weaker, though).

    throws_lemy OP ,
    @throws_lemy@lemmy.nz avatar

    You are not really wrong, TPM was designed by Trusted Computing Group consisting of big tech companies like M$, IBM, AMD, Intel, Cisco and HP.

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