Debugging_SALEAE

SALEAE

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saleae appears to be an organization that provides a tool, Logic Analyzer 2 that debugs hardware signals

the software itself is also available for download

Logic 2

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┌──(kali㉿kali)-[~/archive/htb/challenges/debugging_interface]
└─$ ll
total 163M
4.0K drwxr-xr-x 2 kali kali 4.0K Aug 24 10:15  .
163M -rw-r--r-- 1 kali kali 163M Aug 24 10:15  Logic-2.4.9-linux-x64.AppImage
4.0K drwxr-xr-x 4 kali kali 4.0K Aug 24 09:36  ..
 12K -rw-r--r-- 1 kali kali 9.7K Aug 24 09:34 'Debugging Interface.zip'
 12K -rw-r--r-- 1 kali kali 9.5K Apr  8  2021  debugging_interface_signal.sal
 24K -rw-r--r-- 1 kali kali  22K Mar 23  2021  digital-0.bin
 28K -rw-r--r-- 1 kali kali  28K Mar 23  2021  meta.json

The software is called Logic 2 and packaged with AppImage extension for portability in mind

┌──(kali㉿kali)-[~/archive/htb/challenges/debugging_interface]
└─$ chmod 755 Logic-2.4.9-linux-x64.AppImage 
 
┌──(kali㉿kali)-[~/archive/htb/challenges/debugging_interface]
└─$ ./Logic-2.4.9-linux-x64.AppImage 
/tmp/.mount_Logic-4wrbUW ~/archive/htb/challenges/debugging_interface
~/archive/htb/challenges/debugging_interface
Environment
  Executable path: /tmp/.mount_Logic-4wrbUW/Logic
  Executable directory: /tmp/.mount_Logic-4wrbUW
  Original working directory: /home/kali/archive/htb/challenges/debugging_interface
  Current working directory: /tmp/.mount_Logic-4wrbUW
  Process ID: 137099
Crash reporting enabled. Machine ID: 9012639c-bac5-412a-9d7a-0411c2227e64

I will start the application

While it’s meant to be used with their hardware product, it also supports opening up a capture file, presumably .sal file

Loading it up

Loading the .sal file reveals a single channel with the signal in the center

Dragging it further reveals the length in micro seconds Those 3 attributes are what I Debugging_Interface in the meta.json file earlier

I will try the Analyzer to debug the signal

While it appears to support lots of protocols, I will go with the first one; Async Serial

The Bit Rate (Bits/s) option seems to dictate the size of chunk it analyzes.

Since the smallest one that I’ve seen so far was 32.02 in microsecond, it would be about 31230 Bits/s (1,000,000/32.02)

The signal turned into hexadecimal values

The Terminal button supports the conversion and there is the flag at the bottom