Yet another PlayStation 4 exploit has been found. While it may not be one that lets you run CFW, this bug has its own intriguing uses. Scene hacker Flat_z managed to come up with a code that exploits the PS4's Crypto Coprocessor interface. This can lead to being able to bruteforce certain specific keys from the console, such as the AES/HMAC PFS, portability keys, and VTRM, which can then be dumped. This exploit can be used on any PS4 on firmwares below 7.55, as that's when Sony apparently patched the issue. While this doesn't have much use for the end-user right now, we'll be able to see what developers can do with them and if they can further the PlayStation 4 hacking scene.

so, PS4 Crypto Coprocessor (CCP) interface in secure kernel had a bug that allowed us to dump (or better saying, bruteforce) key slots from SAMU,
that's how AES/HMAC keys from PFS, portability keys, VTRM keys, etc could be retrieved on unpatched firmware:https://t.co/6V1BFnKxuM

— Aleksei Kulaev (@flat_z) December 18, 2021

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Source

 

[urherenow]

Aw, shucks...

"In any case all of these are decryption (not encryption) keys, so this cannot be used (in isolation, at least) to fulfill your dreams of a permanent CFW on the PS4."

 

[smf]

I'm glad my ps4 has been turned off for over a year and still running 5.05, I was almost tempted to update it.

 

[Apollo917]

one step closer to cold boot cfw...i hope but dang the ps4 can't catch a break this month

It been a good month!

 

[magus2k]

i really like this pace, one step closer to cold boot.

 

[smf]

i really like this pace, one step closer to cold boot.

Not really, having all the public keys doesn't help you sign anything...