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WordPress Mingle Forum 1.0.32.1 Cross Site Scripting / SQL Injection

WordPress Mingle Forum 1.0.32.1 Cross Site Scripting / SQL Injection
Posted Jan 21, 2012
Authored by Gianluca Brindisi

WordPress Mingle Forum versions 1.0.32.1 and below suffer from cross site scripting and remote SQL injection vulnerabilities.

tags | exploit, remote, vulnerability, xss, sql injection
SHA-256 | f7800979398b4393078ed852972e877ade9fa0fe6a9069c050116b098f877168

WordPress Mingle Forum 1.0.32.1 Cross Site Scripting / SQL Injection

Change Mirror Download
# Exploit Title: Wordpress Mingle Forum plugin <= 1.0.32.1 Multiple Vulnerabilities
# Date: 2012/01/18
# Author: Gianluca Brindisi (gATbrindi.si @gbrindisi http://brindi.si/g/)
# Software Link: http://downloads.wordpress.org/plugin/mingle-forum.1.0.32.1.zip
# Version: 1.0.32.1

You need an authenticated session to exploit the following vulnerabilities.

2) SQL Injection:
POST: admin.php?page=mfgroups&mingleforum_Action=usergroups
delete_usergroups: Delete
dele_usrgrp%5B%5D: 1 [SQLI]

Vulnerable code:

function delete_usergroups(){
if (isset($_POST['delete_usergroups'])){
global $wpdb, $table_prefix;
$delete_usrgrp = $_POST['delete_usrgrp'];
$groups = "";
$count = count($delete_usrgrp);
for($i = 0; $i < $count; $i++){
$wpdb->query("DELETE FROM ".$table_prefix."forum_usergroups WHERE id = {$delete_usrgrp[$i]}");
$wpdb->query("DELETE FROM ".$table_prefix."forum_usergroup2user WHERE `group` = {$delete_usrgrp[$i]}");
}
return true;
}
return false;

2) SQL Injection:
POST: admin.php?page=mfgroups&mingleforum_action=usergroups&do=add_user_togroup togroupusers: users
usergroup: bar [SQLI]
add_user_togroup: Add+users

Vulnerable code:

$group = $_POST['usergroup'];
---
$msg = __("User", "mingleforum")." \"$user\" ".__("added successfully", "mingleforum")."<br />";
$sql = "INSERT INTO ".$table_prefix."forum_usergroup2user (user_id, `group`) VALUES('$id', '$group')";
$wpdb->query($sql);
++$added;

2) Stored XSS:
admin.php?page=mingle-forum

Some options are not escaped so you can inject a payload in the admin interface.
Notice that every option is passed trough update_option() before being saved in
the db so no sqli here

Vulnerable code:

'forum_posts_per_page' => $wpdb->escape($_POST['forum_posts_per_page']),
'forum_threads_per_page' => $wpdb->escape($_POST['forum_threads_per_page']),
'forum_require_registration' => $_POST['forum_require_registration'],
'forum_show_login_form' => $_POST['forum_show_login_form'],
'forum_date_format' => $wpdb->escape($_POST['forum_date_format']),
'forum_use_gravatar' => $_POST['forum_use_gravatar'],
'forum_show_bio' => $_POST['forum_show_bio'],
'forum_skin' => $op['forum_skin'],
'forum_use_rss' => $_POST['forum_use_rss'],
'forum_use_seo_friendly_urls' => $_POST['forum_use_seo_friendly_urls'],
'forum_allow_image_uploads' => $_POST['forum_allow_image_uploads'],
'notify_admin_on_new_posts' => $_POST['notify_admin_on_new_posts'],
'set_sort' => $op['set_sort'],
'forum_use_spam' => $_POST['forum_use_spam'],
'forum_use_bbcode' => $_POST['forum_use_bbcode'],
'forum_captcha' => $_POST['forum_captcha'],
'hot_topic' => $_POST['hot_topic'],
'veryhot_topic' => $_POST['veryhot_topic'],
'forum_display_name' => $_POST['forum_display_name'],
'level_one' => $_POST['level_one'],
'level_two' => $_POST['level_two'],
'level_three' => $_POST['level_three'],
'level_newb_name' => $_POST['level_newb_name'],
'level_one_name' => $_POST['level_one_name'],
'level_two_name' => $_POST['level_two_name'],
'level_three_name' => $_POST['level_three_name'],
'forum_db_version' => $op['forum_db_version'],
'forum_disabled_cats' => explode(",",$_POST['forum_disabled_cats'])

3) Stored XSS and SQLI:
admin.php?page=mfstructure

Adding a new forum both name and description fields are not sanitized so
stored xss payload in admin interface AND forum pages is possible.
They are escaped only for sqli except for add_forum_group_id which is exploitable

Vulnerable code:

$add_forum_description = $wpdb->escape($_POST['add_forum_description']);
$add_forum_name = $wpdb->escape($_POST['add_forum_name']);
$add_forum_group_id = $_POST['add_forum_group_id'];
---
$wpdb->query("INSERT INTO ".$table_prefix."forum_forums (name, description, parent_id, sort)
VALUES('$add_forum_name', '$add_forum_description', '$add_forum_group_id', '$max')");

4) Stored XSS:
admin.php?page=mfads

Every textarea input is not sanitized and can lead to stored xss payloads in admin interface
and forums pages (this is somehow intended behavior since HTML is allowed but still...)
i.e: "></textarea>[XSS]

Vulnerable code:

'mf_ad_above_forum_on' => $_POST['mf_ad_above_forum_on'],
'mf_ad_above_forum' => $_POST['mf_ad_above_forum_text'],
'mf_ad_below_forum_on' => $_POST['mf_ad_below_forum_on'],
'mf_ad_below_forum' => $_POST['mf_ad_below_forum_text'],
'mf_ad_above_branding_on' => $_POST['mf_ad_above_branding_on'],
'mf_ad_above_branding' => $_POST['mf_ad_above_branding_text'],
'mf_ad_above_info_center_on' => $_POST['mf_ad_above_info_center_on'],
'mf_ad_above_info_center' => $_POST['mf_ad_above_info_center_text'],
'mf_ad_above_quick_reply_on' => $_POST['mf_ad_above_quick_reply_on'],
'mf_ad_above_quick_reply' => $_POST['mf_ad_above_quick_reply_text'],
'mf_ad_above_breadcrumbs_on' => $_POST['mf_ad_above_breadcrumbs_on'],
'mf_ad_above_breadcrumbs' => $_POST['mf_ad_above_breadcrumbs_text'],
'mf_ad_below_first_post_on' => $_POST['mf_ad_below_first_post_on'],
'mf_ad_below_first_post' => $_POST['mf_ad_below_first_post_text'],
'mf_ad_custom_css' => $_POST['mf_ad_custom_css']
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