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BBC Interviews Fail0verflow and GeoHot on Recent PS3 Hacks


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195w ago - Today the BBC (linked above) has published an interview conducted with PlayStation 3 hackers fail0verflow and GeoHot on the recent PS3 hacks and summarizing the unveiling Sony's secret key.

Below is the interview, to quote: "The PlayStation 3's security has been broken by hackers, potentially allowing anyone to run any software - including pirated games - on the console

A collective of hackers recently showed off a method that could force the system to reveal secret keys used to load software on to the machine.

A US hacker, who gained notoriety for unlocking Apple's iPhone, has now used a similar method to extract the PS3's master key and publish it online. Sony declined to comment on the hack.

"The complete console is compromised - there is no recovery from this," said pytey, a member of the fail0verflow group of hackers, who revealed the initial exploit at the Chaos Communication Congress in Berlin in December.

"This is as bad as it gets - someone is getting into serious trouble at Sony right now."

The group, which has previously hacked Nintendo's Wii and says it is vehemently against games piracy, said that it had developed the hack so that it could install other operating systems and community-written software - known as homebrew - on the powerful machine.

"The details we provided and information and techniques we disclosed would have been enough to install Linux," he said. "We have no interest in piracy."

Following the presentation, US hacker George Hotz, who has previously hacked parts of the console, used a similar technique to extract the master key. He has now published it on his blog.

"This is supposed to be the most secret of secret of secrets - it's the Crown jewels"

This formerly secret number is used to "sign" all games and software that run on the system, to authenticate that it is genuine and approved by Sony.

However, once the key is known it can be used to sign any software - including unofficial software and games.

"I hate that it enables piracy," said Mr Hotz. "The publication of the key is more academic than anything else."

The number also works for Sony's handheld console the PlayStation Portable, said Mr Hotz.

Developers have already started releasing tools to develop new software for the PS3 using the hacks.

'Valid target'

The PS3 - once regarded as the most secure of the game's consoles, and the only one not to have been permanently cracked - has in the last 12 months come under increasingly scrutiny from hackers.

PlayStation hack (George Hotz) Mr Hotz's original hack is widely believed to have led to Sony disabling features on the console. In January 2010, Mr Hotz claimed to have cracked the console.

Following his initial announcement, Sony released an update disabling a function, called OtherOS, that allowed gamers to install a version of Linux on their machines, thought to have been exploited by Mr Hotz.

Many saw it as a pre-emptive strike to guard against games piracy.

Mr Hotz never released the exploit and publicly said that he had stopped work on the console.

But Sony's removal of OtherOS prompted other hackers to begin to look at the system more closely.

"It became a valid target," pytey told BBC News. "That was the motivation for us to hack it."

He said the team had spent "months" trying to find their way into the system.

"It was not trivial to do this," he said.

In the end, the flaw that allowed them to crack the system was a basic cryptographic error that allowed them to compute the private key, held by Sony, he said.

"Sony uses a private key, usually stored in a vault at the company's HQ, to mark firmware as valid and unmodified, and the PS3 only needs a public key to verify that the signature came from Sony.

"Applied correctly, it would take billions of years to derive the private key from the public key, or to make a signature without knowing the private key, even when you have all the computational power in the world at your disposal."

"I'm scared of being hit with a lawsuit"

But the team found that Sony had made a "critical mistake" in how it implemented the security.

"The signing recipe requires that a random number be used as part of the calculation, with the caveat that that number must be truly random and not predictable in any way," the team said.

"However, Sony wrote their own signing software, which used a constant number for each signature."

This allowed the team to use "simple algebra" to uncover Sony's secret key, without access to it.

"This is supposed to be the most secret of secret of secrets - it's the Crown jewels," said pytey.

The team decided to publish its method but not the keys.

After the team revealed their hack, Mr Hotz said that he was prompted to renew his work on the system.

"What fun is a race if no-one else is running," he said. "fail0verflow did great work - they took it up a level."

"It's my own hardware, I can run whatever I like on it"

Using a similar technique he was able to extract the entire master key for the system, which he subsequently publish online along with a demonstration of it in action.

However, he has not released the method he used to extract the key.

"There is no reason to," he said.

However, he said that he may release a piece of software that will allow people to easily sign their own pieces of software and homemade games - also known as homebrew - on to the console.

"I have a program running but am thinking of a good way to release it," he said.

Like fail0verflow, he said that he does not condone games piracy.

"I do not want it to be able to sign official Sony programs. I'd like it just to be able to sign homebrew."

fail0verflow said it "disagrees" with Mr Hotz's decision to release the key, saying that it expects them "to make piracy easier without accomplishing intrinsically useful".

Legal worry

Sony takes a dim view of people hacking its system.

Last year, a team released a USB dongle called PSjailbreak that contained software that allowed gamers to play homemade and pirated games on the PlayStation 3.

Sony updated its consoles to block the software and took legal action against distributors in many countries.

However, according to pytey, it may not be so easy to fix the problem this time.

"The only way to fix this is to issue new hardware," he said. "Sony will have to accept this."

He said that he thought his group was on safe legal ground with its work.

"I haven't stolen anything," he said. "It's my own hardware, I can run whatever I like on it.

Mr Hotz also defends his actions, although admits he is "scared of being hit with a lawsuit".

"I am confident I would win since what I released was just a number obtained by running software on the PS3 I purchased"."



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Comments 33 Comments - Go to Forum Thread »

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Rocky5's Avatar
#13 - Rocky5 - 195w ago
Ok correct me if I'm wrong but new hardware won't fix the signing of files with the master key, the new hardware will only fix the bootloader not allowing the replacement of lv2/GameOS on startup.

They would need to replace the masterkey with a new one but make new hardware backward compatible with the old keys so that all current software would run, but then you would need to make all new software work on old hardware using the old keys, so there screwed key wise, unless they just forget old systems and all 40+ million consumers.

mik30's Avatar
#12 - mik30 - 195w ago
Quote Originally Posted by Chivafighter View Post
Wow, The only way to fix this is for sony to release new hardware.


Not at all. Sony will release a new Firmware that uses new (correct) public keys. All new Software released is signed with a new correct signing routine. All older software get's an update from PSN that uses the new signing procedure. As usual all PSN connects require the latest Firmware. That's it and the hole is closed... at least for newly sold consoles and all those who want to connect to the PSN.

tifozi1's Avatar
#11 - tifozi1 - 195w ago
Sony made its biggest mistake in the PS3 realm by removing OtherOS (save the trouble of tying it to anger etc). It's second biggest mistake will be to go after geohot or f0f. You can bet he will get huge funding for defense from everyone including wealthy anonymous private sources (I have a $100 reserved already and more if needed personally ) not to mention that piracy will really take off because of the controversy and the ease of the even-a-cave-man-can-do-it hack that are on the way.

First order of things would be to correct its own mistakes in code, see if a different hardware version is a feasibility, expedite PS4 development and hire geohot. Don't make stupid hasty decisions by taking a legal recourse in this instance.

zarcon's Avatar
#10 - zarcon - 195w ago
Piracy is bad! Sony will release new hardware and soon game developer will move to new hardware. PS3 will be dead with no new games like PS2. Everyone will be so happy to spent more money to buy new system thanks to these hackers. I really hope they don't bust the game business.

Pcsx2006's Avatar
#9 - Pcsx2006 - 195w ago
I salute failOverflOw team and GeoHot, they are hard working and very brave too.

enuff said.

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