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New syscall enabled  Go to the The BrownOS challenge

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New syscall enabled
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Have you heard? There is a new version of BrownOS out!

It has a whole new syscall, but I haven't been able to figure out its purpose yet. Seems pretty useless so far...
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RE: New syscall enabled
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I still cant figure out that something might be the cmd to interrupt and transfer my parameters to the kernel
maybe someone can code something up?.
The geeks shall inherit the properties and methods of object earth.
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Wait... there is a kernel!? Happy
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RE: New syscall enabled
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Quote from Gizmore
Sep 10, 2018 - 18:09:02

I still cant figure out that something might be the cmd to interrupt and transfer my parameters to the kernel
maybe someone can code something up?.

You wanted come CLI script which easily sends data to the service?!
Here is one:
GeSHi`ed Python code for brownos.py
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import re
import time
import socket
 
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)sock.connect(('wc3.wechall.net', 61221))
while True:
        data = raw_input('Cmd?:')
        data = re.sub('[^A-Za-z0-9]', '', data)
        data = re.findall('..', data)        data = ''.join([chr(int(x, 16)) for x in data])
        print('Sending: %r' % (data,))
        now = time.time()
        sock.send(data)
        print('Received: %r' % (sock.recv(10000), ))        print('Execution took: %.2f seconds' % (time.time() - now))
 


GeSHi`ed Plaintext code
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Cmd?:05 00 FD 00 05 00 FD 03 FD FE FD 02 FD FE FD FE
Sending: '\x05\x00\xfd\x00\x05\x00\xfd\x03\xfd\xfe\xfd\x02\xfd\xfe\xfd\xfe'
Received: ''
Execution took: 18.26 seconds
Cmd?:
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RE: New syscall enabled
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SPOILER ALERT
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RE: New syscall enabled
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Quote from Gizmore
Sep 10, 2018 - 18:09:02

I still cant figure out that something might be the cmd to interrupt and transfer my parameters to the kernel
maybe someone can code something up?.



In Bash:
echo 00 01 02 03 ... | xxd -r -p | nc wc3.wechall.net 61221 | xxd
The spoiler being that the service takes binary input. But that has been devulged elsewhere, so not much of a spoiler.
Hint: If you give it good input, you get good stuff back... Now, what is good input? ;)
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