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Fail0verflow: 27C3 PS3 Exploit Hacker Conference 2010 Highlights

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218w ago - Update: As planned, today Marcan42 has showed a Fail0verflow live demo (videos below) of him booting up a PS3 Slim to a Linux Kernel during the Lightning Talks as part of Day 4 at the 27C3 PS3 Exploit Hacker Conference.

Below are the fail0verflow PS3 exploit details along with related 27C3 (Chaos Communication Congress) Hacker Conference 2010 PlayStation 3 highlights.

Currently it includes an outline and details on PS3 SELF Crypto and PS3 SELF File Format and Decryption, and will be updated throughout the day as new details and video footage (full video now HERE- Thanks zeromx) arrive.

As previously reported, the PS3 hacking segment took place today at 16:00 (local time) in Saal 1 and a live stream was available in the following formats:

PS3 27C3 Hacker Conference 2010 Summary:

  • Fail0verFlow is Coming: http://fail0verflow.com/ and http://twitter.com/fail0verflow (Dongle-less PS3 JailBreaking, overflow by replacing PS3 revoke list with a large one at bootup due to Sony's flawed implementation of ECDSA in not having a random K value)
  • Fail0verflow Tweets: Yes, we'll release all our tools as soon as we cleaned them up in January or so. Myth: Geohot -> Sony pulls OtherOS -> JB -> Fail. Fact: Slim had no OtherOS -> Geohot -> ... . Geohot started his work due to the Slim. There is absolutely no doubt in our mind that the PS3 lasted as much as it did due to OtherOS. The security really is terribly broken. Note: we won't be working long-term on CFW or similar. We'll release tools and a PoC, someone else can take over. The fun part is done we only started looking at the ps3 after otheros was killed. the website will launch when it launches. Almost certainly not tomorrow. fail0verflow is the name of our 'group'. We are a bunch of curious hackers who have been working on a bunch of things over the last 3 years. Our goal is to have linux running on all existing PS3 consoles, whatever their firmware versions. Our current PS3 goal: AsbestOS.pup. For all those out there that think fail0verflow.com has been hacked - it hasn't. We're just busy working on a demo for tomorrow. Patience!
  • Marcan42 Tweets: Clarification #4: The random number isn't 4, it's more like 007eabbb79360e14df1457a4194b82f71a0dc39280 (example). But it's still constant. Clarification #3: The private keys refer to keys that Sony HQ uses. PS3s don't have these keys (but we calculated them due to the fail). It's Sony not knowing WTF they're doing when making signatures, and thus mathematically leaking their keys. This is also why we didn't use the term "exploit" or "bug". The PS3 signature fail is neither an exploit nor a bug (in the PS3 firmware). The XKCD "return 4" function that we showed is (essentially) part of the code that Sony HQ runs to sign games, it's not in the PS3 FW. No one can create a new metldr (for an existing console). Not even Sony (unless they have that console's key stashed somewhere).
  • Marcan42 Tweets cont'd: We don't have the game signing key but the same epic fail applies to it. Once someone dumps appldr they can calculate it too. They actually CAN change keys for LV2/LV1, isolated modules, rvklists, spp, but that's useless because you can just downgrade the loaders. Myth #2: Sony can change keys. No, they can't. These aren't encryption keys, they're signing keys. If they change them GAMES STOP WORKING. Myth #1: It took us 3-4 years to do this. Negative, this exploit only took a few months after we started working. We weren't trying before.
  • Marcan42 Tweets cont'd: FWIW lightning talks tomorrow are at 11:30-13:45. PS3 demo will be 4 minutes _somewhere_ within that range (to be determined). They can try to whitelist every existing piece of official PS3 code... but good luck with that. IOW they CANNOT change keys or fix this in a new firmware, because stuff we sign is every bit as good as existing official software. Wii fakesigning vs. PS3 epic fail: Wii issue is a BUG in console code (fixable), PS3 issue is a FAIL in THEIR secret signer (not fixable).
  • Marcan42's PS3 NOR Flash 40-50 Wire Mod (more pictures HERE) http://twitter.com/marcan42/status/16985058829144065
  • Public Private Keys Calculated, Current PS3 Firmware vulnerable and downgradeable
  • Signing (SELF Packages) - Not Games (No Apploader Keys), PS3 SELF Decryption Code by ooPo (GIT)
  • Live Demo by Marcan42 (confirmed above via Twitter) during Lightning Talks tomorrow- Day 4, Room Saal 3, Start time 11:30, Duration 02:15.
  • MPlayer port to PS3 in the works, confirmed by lantus on IRC.
  • From sven via IRC: Although only PS3 keys up to 3.15 are currently available, it is now possible to build an AsbestOS.PUP. There is an overflow with the revocation lists, we could have put a huge revocation list on the NOR which lv1 will happily load and then use that to break lv2ldr and patch out the signature check but then we found the private key. We don't have lv1 yet because we don't have the lv1 loader key.
  • phiren on IRC states: Well, all currently released ps3's are broken forever. With a bit of effort they could update it to take a new private key, but then they would have to release 2 packages, one signed with the old key and one signed with the new key and their security model is still fundamentally flawed.
  • 27C3 Console Hacking 2010 Presentation Slides (PDF) are now available.

Updates from PS3 Wiki (ps3wiki.lan.st):

PS3 SELF Crypto: Here is a small summary on how the self cryptography works.

Basically here are the steps being involved by the loaders:

Loaders all have a static key and iv called respectively erk and riv, those are keys for the first decryption step which are used to decrypt the very first 0x40 bytes of the self's metadata using AES256CBC

Then the result is used as a key and iv to decrypt the rest of the metadata using AES128CTR, finally the decrypted metadata contains the keys and iv for each data sections which are still decrypted through AES128CTR. This security model is based on the fact that the first 0x40 bytes of the self's metadata once decrypted by the static AES256CBC key in the loader should never be the same from one binary to the other. The same goes for any other value used as an AES128CTR key or iv.

Loaders are also involved with deflating the binaries using zlib.

The self authenticity is based on other independent steps, HMAC-SHA1 (which I believe to be possible leftovers from the playstation portable's kirk engine code) and ECCDSA for the actual signature.

PS3 SELF File Format and Decryption:

File Format

- Numbers are stored in big endian format.

SELF Header

[Register or Login to view code]

Program Info

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Control Information

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Metadata Information

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- The key and ivec fields are encrypted using AES256CBC.

Metadata Header

[Register or Login to view code]

- The metadata header is located after the metadata info in the SELF file.
- It is decrypted using AES128CTR with the key and ivec entries from the metadata information.

Metadata Section Headers

[Register or Login to view code]

- The metadata section headers are located after the metadata header in the SELF file.
- The number of sections is indicated by the sectionCount entry in the metadata header.
- They are decrypted using AES128CTR with the key and ivec entries from the metadata information.
- Section data is decrypted using AES128CTR with the key and ivec from the metadata keys specified by keyIndex and ivecIndex.
- Section data will also need to be uncompressed using zlib.

Metadata Keys

[Register or Login to view code]

- The metadata keys are located after the metadata section headers in the SELF file.
- The number of keys is indicated by the keyCount entry in the metadata header.
- They are decrypted using AES128CTR with the key and ivec entries from the metadata information.
- Some keys are 160-bit SHA-1 and span two consecutive keys.

Extracting an ELF

ELF Header

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Section Data

- Unknown, manually copying the data over works for now.
- There should be a section data offset somewhere.

Program Headers

[Register or Login to view code]

Program Data

- Load the metadata information and decrypt the key and ivec entries using AES256CBC using erk and riv.
- Load the metadata header and decrypt it using AES128CTR with the key and ivec entries from the metadata information.
- Load sectionCount metadata section headers and decrypt them using AES128CTR with the key and ivec entries from the metadata information.
- Load keyCount metadata keys and decrypt them using AES128CTR with the key and ivec entries from the metadata information.
- For each metadata section:
- In the SELF file, fseek to dataOffset and read in dataSize bytes.
- Decrypt the data using AES128CTR with the key and ivec from the metadata keys specified by keyIndex and ivecIndex from the metadata section header.
- Uncompress the data using zlib.
- Write it to the ELF file as the program section specified by sectionIndex in the metadata section header.

Fail0verflow: 27C3 PS3 Exploit Hacker Conference 2010 Highlights

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Comments 123 Comments - Go to Forum Thread »

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#103 - whinis - 218w ago
whinis's Avatar
It shouldn't remove HV just gameOS, But yes there will be no RSX driver unless they strip it from gameOS.

#102 - barrybarryk - 218w ago
barrybarryk's Avatar
um doesn't the update.pup completely remove gameOS? If so why not just downgrade when you want to use linux at least then you wont lose the ability to play games.

And without the hypervisor running it'll be very difficult to get 3d acceleration running as there is no RSX driver, people have been trying to cobble one together for years with very little success.

#101 - mon3y1 - 218w ago
mon3y1's Avatar
Sweet SONY GOT OWNED!! Can't wait good work guys!

#100 - BwE - 218w ago
BwE's Avatar
kinda annoying how people are using the word "fail" in the wrong context.

its just - silly.

#99 - RexVF5 - 218w ago
RexVF5's Avatar
Read the "Clarification #3" explanation from Marcan: http://www.ps4news.com/ps3-hacks-jailbreak/fail0verflow-27c3-ps3-exploit-hacker-conference-2010-highlights/

And addition from someone else:
... because that causes the R value to be the same, i.e. the first half of every signature is the same.

I think he mentioned that it surprised them a lot when they saw it.

#98 - Indestructible - 218w ago
Indestructible's Avatar
Encryption is basically a mathematical formula using large prime numbers. There needs to be a random variable injected into the beginning of your equation in order for the encryption to work effectively.

If that number ISN'T random, you can work backwards through the equation, and solve for x If you can do that, you can determine what the actual signing key is.

#97 - Preceptor - 218w ago
Preceptor's Avatar
Quote Originally Posted by Transient View Post
So how did they figure out that the random number wasn't random in the first place? They didn't actually say, ...

Ok, that is what I wanted to know, thanks.

#96 - Jes03 - 218w ago
Jes03's Avatar
yep, $ony brought it on themselves by removing Linux. That was their stupidest move this year.

The xbox360 scene has always been lame as its so locked up tight the 360 cant do anything close to what the PS3 can do. Even before homebrew the 360 is crap. (I have 4 360's. I'm not a fanboy at all)

#95 - plains203 - 218w ago
plains203's Avatar
If you can spare the time have a watch of the presentation it does a great job of explaining what is going on. This team have done a great job. These guys coupled with Graf are really laying down the foundations. The xbox 360 scene is going to look lame in comparison to the ps3 scene thanks mostly to the uproar Sony created by removing support for linux.

#94 - FMAranda - 218w ago
FMAranda's Avatar
is0mick and Sagarp14
Thanks! And WOW, that was very good, they brought Linux back, maybe next month they will release a fw update. No dongle needed.


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