[MajorSecurity Advisory #53]BLUEPAGE CMS - Cross Site Scripting and Session Fixation Issues

Details

Product: BLUEPAGE CMS
Security-Risk: moderated
Remote-Exploit: yes
Vendor-URL: http://www.bluepage-cms.com/
Vendor-Status: informed
Advisory-Status: published

Credits

Discovered by: David Vieira-Kurz
http://www.majorsecurity.de

Affected Products:

BLUEPAGE CMS 2.5 and prior

Original Advisory:

http://www.majorsecurity.de/index_2.php?major_rls=major_rls53

Introduction

BLUEPAGE CMS is an easy to handle content management system.

More Details

1. cross site scripting:

---

-Input passed directly to the "whl", "var_1" and "search" parameter in "index.php" are not properly
sanitised before being returned to the user.
This can be exploited to execute arbitrary HTML and script code in a user's browser session in
context of an affected site.

2. session fixation:

---

The "PHPSESSID" parameter can be set to a malicious and arbitrary value.

3.1 Description:
In a session fixation attack, the attacker fixes the user's session ID before the user even logs into
the target server.
After a user's session ID has been fixed, the attacker will wait for them to login.
Once the user does so, the attacker uses the predefined session ID value to assume their online
identity.

3.2 PoC:

http://localhost/BluePageCMS/?PHPSESSID=15031988

3.3 Workaround:

1. Do not accept session identifiers from GET / POST variables.
   2.Regenerate SID on each request.
2. Accept only server generated SID:
   One way to improve security is to not accept session identifiers not generated by server.

if ( !isset( $_SESSION['SERVER_GENERATED_SID'] ) ) {
session_destroy(); // destroy all data in session
}
session_regenerate_id(); // generate a new session identifier
$_SESSION['SERVER_GENERATED_SID'] = true;

Solution

Edit the source code to ensure that input is properly sanitised.
You should work with "htmlspecialchars()" or "htmlentities()" php-function to ensure that html tags
and javascript code are not going to be executed.

Example:
$password = htmlentities($_POST['pass']);
$search = htmlspecialchars($_GET['search']);
?>

MajorSecurity

MajorSecurity is a German penetrationtesting and security research company which focuses
on web application security.
We offer professional penetrationtestings, source code analysis and reliable proof of concepts.
You will find more Information about MajorSecurity at
http://www.majorsecurity.de/