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Erlang Bytecode String Converter

Erlang Bytecode String Converter
Posted Dec 21, 2020
Authored by Jeremy Brown

estr2bc is a python script to convert arbitrary string input to Erlang bytecode.

tags | tool, arbitrary, python
systems | unix
MD5 | 095fa28eaa19faca6a6c82b238094580

Erlang Bytecode String Converter

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#!/usr/bin/python
# -*- coding: UTF-8 -*-
#
# estr2bc.py
#
# Convert arbitrary string input to Erlang bytecode
#
# Jeremy Brown [jbrown3264/gmail]
# Dec 2020
#
# Example
# > estr2bc.py "ps -aux"
# [112,115,32,45,97,117,120]
#
# > rpc:call('node', file, write_file, ["test", [112,115,32,45,97,117,120]]).
#
# There's probably a native way to do this within Erlang, but this script is
# useful in the exploit chain eg. for generating Riak file:write_file payloads
#

import os
import sys
import argparse
import string

#
# enough for most things
#
string_special_1 = ' !"#$%&\'()*+,-./'
string_special_2 = ':;<=>?@'
string_special_3 = '[\\]^_`'

class Estr2bc(object):
def __init__(self, args):
self.input = args.input

def run(self):
special_1 = dict()
for i, c in enumerate(string_special_1):
special_1[c] = i + 32

numbers = dict()
for i, c in enumerate(string.digits):
numbers[c] = i + 48

special_2 = dict()
for i, c in enumerate(string_special_2):
special_2[c] = i + 58

alpha_upper = dict()
for i, c in enumerate(string.ascii_uppercase):
alpha_upper[c] = i + 65

special_3 = dict()
for i, c in enumerate(string_special_3):
special_3[c] = i + 91

alpha_lower = dict()
for i, c in enumerate(string.ascii_lowercase):
alpha_lower[c] = i + 97

bytecode = ""

for c in self.input:
if(c in string_special_1):
bc = str(special_1[c])
elif(c in string.digits):
bc = str(numbers[c])
elif(c in string_special_2):
bc = str(special_2[c])
elif(c in string.ascii_uppercase):
bc = str(alpha_upper[c])
elif(c in string_special_3):
bc = str(special_3[c])
elif(c in string.ascii_lowercase):
bc = str(alpha_lower[c])
else:
print("error: can't map character '%s'" % (c))
return -1

bytecode += bc + ','

bytecode = bytecode[:-1]

print("[%s]" % bytecode)

return 0

def arg_parse():
parser = argparse.ArgumentParser()

parser.add_argument("input",
type=str,
help="String you wish to convert to bytecode")

args = parser.parse_args()

return args

def main():
args = arg_parse()

esb = Estr2bc(args)
result = esb.run()

if(result != 0):
sys.exit(-1)

if(__name__ == '__main__'):
main()
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