Bugs & Vulnerabilities

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Theoretical Hardware Attacks

We already know for certain someone out there has hacked the SAMU or stolen Sony's keys because of leaked decrypted kernels. PS4 has been out for 4 years or so and we are still running crappy browser based exploits. It is time to set up our console game people! These are some end all hardware solutions to hack the PS4 theorized by golden. I give a score out of 10 for each.

Power analysis against SAMU 9.9/10

There are theories that this wont work because...

  • SAMU silicon spoofs hamming weight (prevents differential power analysis and EM analysis)
  • It is running too fast and not feasible since cost is too high
  • You can't slow down the SAMU clock since it is internally checked
  • Some more issues?

If there is some sort of main CPU/SAMU PLL bypass we might be able to slow the clock down really easily, otherwise we must inject our own clock signal. I believe the SAMU clock is controlled by syscon? If the check is in syscon then we can just patch it out. Maybe write a custom Linux fork that never loads into userland but just sits and constantly decrypts different self/sprx files. We could communicate with this Linux fork over UART. This attack only needs to work once to recover some keys.

SAMU power/clock glitch fault injection 5/10

During an AES round we might be able to do some SCA by injecting faults. See the paper from umass.edu in the section below. We would write a minimal operating system to reboot into after exploiting an older firmware. This 'operating system' will simply shutdown most of the CPU cores and pin one core. This code would communicate with the SAMU and do everything the normal SCE SAMU driver does for decryption. We can then use UART output from CPU to time our glitch attacks. The faulty data retrieved by our custom SAMU driver might be able to reveal secret key data. This attack only needs to work once to recover some keys.

SAMU backside UV/IR fault injection 3/10

Just as the title states. Very expensive to setup and do properly. If we can flip an even number of bits it the encrypted SAMU SRAM region of the chip (even since ECC parity bit), then some sort of side channel analysis might be able to be done to recover key material. Some silicon reverse engineering would be involved to find the SRAM region on die.

"Moreover, it is no longer possible to hit a single SRAM cell with the current etching technologies, since the width of the gate dielectric is now more than 10 times smaller than the shortest wavelength of visible light." To get an idea of the cost of this equipment... "A class of threats which cannot be ignored if the attackers have access to a larger budget (above the aforementioned $3000 and up to millions of dollars)" (http://euler.ecs.umass.edu/research/bbkn-IEEEP-2012.pdf)

The fault injection is all infeasible unless some elite hackzor came out of the woodwork. We only need to have this work once.

SEM/FIB/microprobes 2/10

We might be able to readout the bootrom with some microprobes? Sniff data lines somewhere? The SAMU SRAM memory is encrypted so we would have to probe the LM32 instruction bus or something... infeasible but possible.

Aeolia/Belize glitching 8/10

This is a theoretical hack to gain unsigned code execution on the southbridge for all motherboard/console revisions. You might be able to glitch the EMC bootrom in order to bypass further signature checks and break the chain of trust. You can attack the main FreeBSD kernel from here. This hack might involve slowing down the syscon clock. Timing the glitch based on SPI read accesses then either doing a power glitch or clock glitch to skip signature check. If the glitch fails, then we simply reset. This can be done with a very cheap CPLD/FPGA. Most Xbox 360 glitching modchips used a Xilinx Coolrunner because it is cheap and easy to use (board can cost as low as $5). This attack might not work due to unknown encryption keys.

USB pwnage

The FreeBSD USB stack has been theorized, by a well know security researcher, to contain some high profile bugs. A dongle might just be possible. For example, last year someone ran a fuzzer on the Linux USB stack and found some crazy bugs: https://github.com/google/syzkaller/blob/master/docs/linux/found_bugs_usb.md

Bluetooth pwnage

Look at Blueborne and CVE-2017-0781. There are probably some bugs in the Sony/FreeBSD Bluetooth stack. Sony has a habit of ruining their own copy and paste. One of the reasons fail0verflow decided to attack the DS4 controller firmware was because it had a nice interface to the kernel which could contain bugs.

Unknown / unpatched

SnagFilms

A possible exploit has been found in the SnagFilms app in the PSStore app.

Arbitrary code execution in memory has been demonstrated, although so far the system will throw an exception in the programs memory before the payload finishes loading.

If you craft a small enough payload and/or a payload that load's without causing an exception in program memory you can most likely get code execution working.

http://i.imgur.com/5OrSFCa.jpg

(BattleCars Exploit-Rocket League)

Buffer Overflow- [Current system software, Most recent version of application(SYSSW 2.57)/(Rocket League 1.03)]

First block all requests from:https://patch103-dot-psyonix-rl.appspot.com/

When you launch Rocket League it gets a stub file from: http://psyonix-rl-529970.c.cdn77.org/BC2/versions/103/config/BattleCars_Prod/client.bin

You can redirect that to load a huge file and/or a specifly crafted payload instead of the stub. If you use the proper file, it doesn't need to be that large, the example below is under 9mb.

Your file will be loaded into memory, when the file is large enough/a game is played and/or you wait enough time you can consistently cause a buffer overflow and the application will crash.

Depending on how you craft your payload, you may or may not have to do any of that get it working. There are no checks performed at all on file size, content, ect.

Staying on the start screen for long enough can also trigger it. If your payload isn't created properly it will take much longer to execute.

If you are having problems getting this working, you can use the example file, causing an almost instant buffer overflow upon launch of the application.

http://sceecatalogs.vidzone.tv/469/vidzone_469_US.db.psarc

If your payload is crafted properly, you should be able to get it working withing 10-20 seconds of launching the application . A carefully crafted file may be able to exploit this or similar issues to gain code execution, among other things. It may also be possible to alter gameplay via similar methods.

No payload will be provided at the moment because this is very experimental.

VidNow (TCP Buffer Overflow)

A possible exploit has been found in VidNow app from the PSStore App.

PATCHED: Sony has hotfixed this exploit via content hashing the file while in transit. Some people have managed to reverse the hotfix but the method is not known - the PS4 checks the content. hash HTTP header from the HMAC header.

When you launch Vidnow for the first time it gets http://sceecatalogs.vidzone.tv/386/vidzone_386_US.db.psarc. This file is 5mb. This file loads into a 60k tcp buffer. No checks are done at all on the files size/hash/contents. Therefore, it is possible to redirect Vidnow to load a substitute file. When vidnow is redirected to load a large enough file the TCP Window buffer is overrun,somewhere between byte 34,125,000 and 35,000,000 of the substitute file. Despite the buffer overflow and crash, the substitute data is still transmitted and the application only throws the exception when another tcp packet is sent. As a result, the application crashes and the console locks up for a minute. Directly before the console resumes normal operations after the crash, an unusually large number of tcp (RST) packets are sent. While no exploit that makes use of this crash is currently available, a carefully crafted file may be able to exploit this or similar issues to gain code execution, among other things.

Crash Timeline

17:17:39.899984000 Request
17:17:40.000655000 Request
17:17:40 (System locks up) Crash
17:17:44.957274000 Response
17:17:48.500481000 Response
17:17:48.500567000 Response
17:17:50.356427000 (System no longer locked up) Console Regains Control (74 byte packet sent)
17:17:50.357555000 Contacts Crashlog Server/System Operation Resumes

Sandbox Exploitation

For some reason the system fails to perform any checks/verify certain sys library's before installing them. This allows you to replace those library files with your own binary. The system will install your packaged binary to the HDD as if it were a regular update. In order to run this binary, you need to meet all the requirements listed below.

Running your own code in sandbox requires 4 things:

1.Disabling SHA-1 Checksums ✔ useSha1Checksums = "false" OR -Change SHA-1 checksums to match modified pkg

2.Generate a valid signature/disable or bypass signature authentication ✖ Hash of container + Magic Number form signature -Hash can be computed from modified files -Magic Number = ???

3.Repacking Containers ✔ Lib pkg not signed or encrypted. You can modify everything as long as you don't change the structure.

4.Crafting proper binary ✔ Binary files in sandbox aren't signed or encrypted. If you use the proper version of the compiler (Get the ver info from the original binarys) you can craft a binary that's accepted as valid.

Assuming you can get code running disabling sandboxing is trivial.

Leap second 23:59:60 bug

http://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat Leap second 2015 June 30, 23h 59m 60s should theoretically not be a problem, since PS4 is based on BSD which can implement 23:59:60.

Patched

Decryption of any post-prototype and low FW PUP

  • Discovered by flatz.
  • A bug in the handlers of PUP decryption allows a PS4 on 1.62 or below to decrypt any PUP (retail, testkit, devkit, beta, prototype) with a version above 1.00 (post-prototype)
  • SM code doesn't reset state after SMI checks failure, so to decrypt arbitrary PUP, you need to ignore mailbox error after PupDecryptHeader cmd (1).
  • Fixed around 1.70

Decryption of any userland SELF from 1.00 to 3.70

  • Sony reused keys from 1.00 to 3.70 on userland modules. as a result, any userland module from those versions can be decrypted on a PS4 between 1.00 and 3.70.
  • Fixed in 4.00 with the introduction of new keyset.

Internal kernel table of symbols kept on very low versions

  • Sony used to have two tables of symbols on very low versions: internal and external (internal had all symbols, external had 75% of them).
  • Seen in 1.01 kernel. Patched somewhere around 1.05.

External kernel table of symbols kept on low versions

  • After Sony removed internal table, they still kept the external one.
  • Seen in 1.01-1.76 kernels. Patched somewhere around 2.50.

IDPS leak in sceSblAuthMgrDriveData on low retail versions

  • Discovered by flatz
  • Dumping IDPS from 2 EID blocks from kernel: sceSblAuthMgrDriveData(0, in_buf, 0x160, out_buf, 0xA4, 1). Pass 0x160 bytes at 0x90C00 from sflash0s1.crypt into `in buf` and dump buffers.
  • It's possible because someone from sony forgot to encrypt output, that's how it was patched later.
  • Patched between 1.76 retail and 4.05 retail. Works on any TestKit/DevKit FW.

Crashdumps encryption using symmetrical key and same key across fw

  • Patched on 4.50. Tested between 1.01 and 4.07.

Reference sites

Reverse Engineering
Dumps & Strings
Dumps
Strings
Communication
USB
Wifi/LAN
Keys, Commands & Digests
Emulation
General
Compatibility Lists
System Modules
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