Username: 
Password: 
Restrict session to IP 

New syscall enabled  Go to the The BrownOS challenge

Global Rank: 1
Totalscore: 755063
Posts: 398
Thanks: 436
UpVotes: 382
Registered: 10y 213d












The User is Offline
New syscall enabled
Google/translate1Thank You!2Good Post!1Bad Post! link
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...
Global Rank: 233
Totalscore: 84897
Posts: 1356
Thanks: 1201
UpVotes: 716
Registered: 12y 9d




Last Seen: 15d 19h
The User is Offline
RE: New syscall enabled
Google/translate0Thank You!0Good Post!0Bad Post! link
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.
Global Rank: 6
Totalscore: 477556
Posts: 91
Thanks: 90
UpVotes: 81
Registered: 10y 128d





The User is Offline
RE: New syscall enabled
Google/translate0Thank You!0Good Post!0Bad Post! link
Wait... there is a kernel!? Happy
Global Rank: 482
Totalscore: 46531
Posts: 200
Thanks: 177
UpVotes: 173
Registered: 9y 70d
space`s Avatar
The User is Offline
RE: New syscall enabled
Google/translate0Thank You!0Good Post!1Bad Post! link
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
1
2
3
4
56
7
8
9
1011
12
13
14
1516
17
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
1
2
3
4
5
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?:
Contact only via c3BhY2VAd2VjaGFsbC5uZXQ= or PM...
Windows can be secure... but only if you don't use it Happy
Global Rank: 1
Totalscore: 755063
Posts: 398
Thanks: 436
UpVotes: 382
Registered: 10y 213d












The User is Offline
RE: New syscall enabled
Google/translate0Thank You!0Good Post!0Bad Post! link
SPOILER ALERT
Global Rank: 640
Totalscore: 35585
Posts: 73
Thanks: 34
UpVotes: 37
Registered: 2y 20d
Last Seen: 96d 16h
The User is Offline
RE: New syscall enabled
Google/translate0Thank You!0Good Post!0Bad Post! link
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? ;)
UnQuaiz, dloser, Redknee, ckclark, tunelko, silenttrack, qdxy, n0tHappy, TheHiveMind, Z, Ge0, samuraiblanco, arraez, jcquinterov, hophuocthinh, alfamen2, burhanudinn123, Ben_Dover, stephanduran89, braddie0 have subscribed to this thread and receive emails on new posts.
1 people are watching the thread at the moment.
This thread has been viewed 1005 times.