@chronic 1/ there’s no such bootloader as BSS, there’s iBSS (iBoot Single Stage) instead

2/ LLB cannot enter recovery mode, it enters DFU-like mode

3/ boot-command upgrade makes it boot new iBEC, not iBSS

4/ SecureROM versions do NOT match iBoot version at the time of device release
@chronic 5/ there’s console on production iBoot too, although very limited

6/ there’re more iBoot flags than he shows

7/ demotion to 01 is enough to get JTAG (I’d even say SWD). Demotion of Security status isn’t even possible according to @s1guza

@chronic @s1guza 8/8 limera1n isn’t the only bootrom exploit of the past times. There also were Pwnage 1/2, steaks4uce, 24kpwn, SHAtter and alloc8

That was just brief view, by the way
@chronic @s1guza Ah, and there’re many more Apple probes than just Kong and Kanzi

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More from @nyan_satan

5 Jul 20
As promised, here’s my little thread about my experience of repairing 1st-gen KongSWD (all-white)
Although that’s most likely not your case if you got such a cable, but I did manage to break firmware on mine completely. So let’s start with restoring it
Both generations of Kong make use of NXP LPC1768 MCU (Cortex-M3) (along with Xilinx Spartan 6 FPGA, by the way), that can be reflashed over SWD Image
Read 18 tweets
5 Feb 20
Here is my little thread about bugs I’ve found in Image3 parsers of various SecureROMs (well, A4 and A6)

None of them are exploitable, but all of them can cause a crash and/or denial-of-service

Why am I posting this? Just for lulz and from hopelessness

Image
1) memsetting the whole address space

That’s only for A4 (and maybe lower)

Back in February 2019, someone told me about “SHSH tag length underflow”, that allows “arbitrary memset”. The person failed to tell me which ROM it’s for
But for A4 ROM I found something similar. Look at this line of code:

github.com/NyanSatan/Imag… Image
Read 23 tweets
17 Aug 19
Here is my little thread about Power NVRAM — another persistent key-value storage, located right on PMU chip. Only talking about iBoot context
Modifying certain key there allows to enable debug UART on any boot loader (including DFU ones) very early and without touching normal NVRAM

Both keys and values are unsigned 8-bit integers

Now let’s talk about known keys and values for them:
Read 17 tweets
27 Jul 19
Here is my little thread about Lightning video adapters – also known as Haywire – which are actually computers that feature Apple Secure Boot and run Darwin kernel
There’re 2 kinds of Haywire:

1. Lightning Digital AV Adapter (b137ap/iAccy1,1) – Lightning to HDMI adapter, supports both video and audio
2. Lightning to VGA Adapter (b165ap/iAccy1,2) – doesn’t support audio output for obvious reason
Read 20 tweets
31 Jan 19
I was planning to keep this knowledge private, but damn it. This is a thread about Apple SWD cables, some things they can do and how to use them
For now I only have got KongSWD, so everything below applies to this type of cable first of all
f you’re reading this thread, you’ve most likely seen many photos with these weird Apple internal cables posted here, on Twitter, — Gorilla, Kong, Kanzi, Chimp, Flamingo, etc.

Read 29 tweets

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