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PS3 Hacker Mathieulh on 3.60 Firmware LV0 Dump Exploit & Keys


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196w ago - Today PS3 hacker [Register or Login to view links] has tweeted some new details on dumping LV0 from PlayStation 3 3.60 Firmware and obtaining the new keys, followed by [Register or Login to view links] claiming he has already reproduced it to confirm it works.

Below are all the tweets, as follows:

Mathieulh's Tweets:

  • xShadow125 You can update from your own pup only from 3.55 or lower, unless you have an exploit.
  • xShadow125 Of course that should be fixed in upcoming lv0 revisions anyway (By moving the ldrs to the top of lv0)
  • xShadow125 You run the 3.60 lv0, then you switch the nor, and pull the cell reset line, and you dump the extra KBs where the loaders are.
  • xShadow125 Basically you have a nor with 3.55 (or lower) lv0 and your own small lv1 code that does the dump, and 3.60 lv0 on the other.
  • xShadow125 You wont get all of lv0 but the part with the loaders shouldn’t be overwritten.
  • xShadow125 You can actually get all the 3.60 keys/loaders without knowing lv0 keys by dumping lv0 from ram with dual nor and signed lv1.
  • To those planning on building a 3.56+ pup for whatever reason, the files attributes changed, the group and user ids for the files as well.
  • The new 3.56+ values for tarballs are the following: owner_id, "0000764" group_id, "0000764" owner, "tetsu" group, "tetsu" ustar, "ustar"
  • You can use fix_tar to use those new values. Use with caution.
  • By comparison, those are the pre-3.56 values. owner_id, "0001752" group_id, "0001274" owner, "pup_tool" group, "psnes" ustar, "ustar"
  • Ps3WeOwnYoU You need to either decrypt or dump lv0, then you can get the encrypted loaders and decrypt them with the metldr key. Good luck.

So, to decrypt this LV0 thing, we need to get to know it better. In the latest blog post by [Register or Login to view links], he has explained briefly what LV0 is in the console’s security.

Anyway, let’s really discuss something PS3 instead of my PC xD, let’s start with Lv0, the most unknown level of the PS3. Lv0 initializes PS3 base hardware such as PowerPC/PPU portion of Cell/BE, SPU isolation for asecure_loader, and gelic ethernet/WLAN device. Lv0 also proudly proclaims itself as the "Cell OS Bootloader".

In older firmwares, 0.80-ish to 3.56, Lv0 initialized SPU isolation on one of the SPUs, then it loaded and decrypted asecure_loader. Asecure_loader or metldr then decrypts the isolated loader, in this case, lv1ldr, then lv1ldr decrypts lv1.self. In 3.60 this changed. Lv0 now has all of the loaders integrated into it as one large fat binary.

All the keys one needs such as Public ECDSA key/AES CBC key and Initialization Vector and ECDSA curve type are in there. Just go ahead and grab them if you can get the ldrs out of the binary.

So, unless you can decrypt Lv0, no 3.60 "CFW" for you . Is there any need for it anyway?

Mathieulh also has some facts to clarify about LV0.

1. lv0 isn’t a loader it’s a ppu binary
2. Lv0 isn’t encrypted per console and can be updated with the rest of the coreos
3. Lv0 is decrypted by the bootloader, there is no such thing as a lv0ldr.
4. The bootloader keys cannot be updated/modified on EXISTING hardware
5. lv0.2 is NOT a binary, it’s a new metadata for lv0 which is to be decrypted and verified by a new bootloader (which is to be available on future ps3s), it is NOT used by the current bootloader (and thus in current playstation 3 consoles)

But wait, messing with this thing could lead to the YLOD tragedy, unless you have those expensive NOR flasher you might want to proceed, and that’s according to rms again.

Lv0 also does some more interesting stuff such as SPU mailbox handling, and eEID integrity checks. Lv0 also used to check for QA flag and proper token, that is now in a spu isolated self in Core OS. Now, if you did tamper with eEID, lv0 will panic out, and your console will then "YLOD", and you’d need a flasher for your PS3 to recover.

Finally, from [Register or Login to view links] on lv0: Lv0 initializes PS3 base hardware such as PowerPC/PPU portion of Cell/BE, SPU isolation for asecure_loader, and gelic ethernet/WLAN device. Lv0 also proudly proclaims itself as the "Cell OS Bootloader". In older firmwares, 0.80-ish to 3.56, Lv0 initialized SPU isolation on one of the SPUs, then it loaded and decrypted asecure_loader.

Asecure_loader or metldr then decrypts the isolated loader, in this case, lv1ldr, then lv1ldr decrypts lv1.self. In 3.60 this changed. Lv0 now has all of the loaders integrated into it as one large fat binary. All the keys one needs such as Public ECDSA key/AES CBC key and Initialization Vector and ECDSA curve type are in there. Just go ahead and grab them if you can get the ldrs out of the binary.

So, unless you can decrypt Lv0, no 3.60 "CFW" for you. Is there any need for it anyway?

Lv0 also does some more interesting stuff such as SPU mailbox handling, and eEID integrity checks. Lv0 also used to check for QA flag and proper token, that is now in a spu isolated self in Core OS. Now, if you did tamper with eEID, lv0 will panic out, and your console will then "YLOD", and you’d need a flasher for your PS3 to recover.




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Comments 381 Comments - Go to Forum Thread »

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#356 - kreus - 151w ago
kreus's Avatar
oh I thought they found a way to decrypt the eboot and unsign. That way it would be possible to reverse engineer. Then all hope is lost hehe

Congrats Cfwprophet and nabnab, I know youre trying hard to make a better place for the scene.

#355 - cfwprophet - 151w ago
cfwprophet's Avatar
We know how it works and have explained a lot of times. The dongle puts your con into debugger mode. In this special mode you can debug games and thats what they do. They use the system embended debugger to let you play those games.

They take the official game selfs from disk and dump out the elf via the sdk, then re-encrypt them as debug selfs and on a special way thats it.

But it takes a bit more work to get this for free for every one done. The keys have nothing to do with it. They use drm just to hide and to be able to milk us all a bit longer till a free version is done.

#354 - kreus - 151w ago
kreus's Avatar
And if someone finds how it works, it should be possible of doing the same thing comparing the eboots without the keys with the ones with keys.

In cryptography, a timing attack is a side channel attack in which the attacker attempts to compromise a cryptosystem by analyzing the time taken to execute cryptographic algorithms. Every logical operation in a computer takes time to execute, and the time can differ based on the input; with precise measurements of the time for each operation, an attacker can work backwards to the input.

#353 - elser1 - 151w ago
elser1's Avatar
its a shame they all think its such a big deal.. its only video games not cure for cancer.. sure it would be great and mean a lot to alot of us but in reality its not that big of a deal, but the way they act gives them a feeling of power i guess.. i don't really understand such behavior, myself i get most enjoyment out of trying to help others..

i wish i bought an xbox when i had the spare cash.. but i love psn too much so ill stick to my ps3 and grin and bare it.. LOL

#352 - kreus - 151w ago
kreus's Avatar
sorry if it sounds stupid, but we seem to already have the equation ecds uses, cant we extrapolate the variables using multiples ps3 on ofw 4.00 and HFW 4.00?

For what i saw the ECDS encryption only works fine if there is only one or a few machines with the same key. With multiple ps3's its possible to extrapolate, and the higher the number the easier it is.

 

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