In this Section

Security Advisory – Magento Multiple Cross-Site Scripting Vulnerabilities

pdf_symbol

Sense of Security – Security Advisory – SOS-09-002

Release Date. 24-Feb-2009
Last Update. 24-Feb-2009
Vendor Notification Date. 21-Jan-2009
Product. Magento
Platform. Linux / PHP (verified), possibly others.
Affected versions. Magento 1.2.0 (verified), possibly others.
Severity Rating. Medium
Impact. Cookie/credential theft
Impersonation
Loss of confidentiality
Attack Vector. Remote
Solution Status. Vendor patch not yet available
CVE reference. CVE-2009-0541

 

Details.

Magento is an ecommerce application. During an application penetration test Sense of Security identified multiple cross-site scripting vulnerabilities in the administrator logon, administrator password reminder and update downloader features of the Magento application. This occurred as a result of the application not properly filtering HTML tags which allowed malicious JavaScript to be embedded. When input is incorrectly validated and not properly sanitised and then displayed in a web page, attackers can trick users into viewing the web page and causing malicious code to be executed.

 

Proof of concept.

The following steps were tested prior to releasing this document on the Magento demo site at:

http://demo-admin.magentocommerce.com/index.php/admin/

 

Admin Login Page:

On a failed login, the value entered into the username field of the admin login page is reflected back to the user without any output encoding.

 

Steps to reproduce:

1. Go to http://magento/index.php/admin/

2. Enter the following into the username field:

%22%3Cscript%3Ealert(‘xss’)%3C/script%3E

3. Enter a nonsense value into the password field such as ‘xxx’

4. Click the Login button

5. You will be presented with a JavaScript alert dialog box containing ‘xss’

 

Password Reminder:

The password reminder function contains a similar vulnerability to the previous one. The value of the email address field is reflected back to the user without any output encoding if the entered email does not exist.

 

Steps to reproduce:

1. Go to http://magento/index.php/admin/index/forgotpassword/

2. Enter the following into the email address field:

%22%3Cscript%3Ealert(‘xss’)%3C/script%3E

3. Click the Retrieve Password button

4. You will be presented with a JavaScript alert dialog box containing ‘xss’

 

Magento Connect Downloader:

The Downloader contains a slightly different bug to two previously described. The ‘return’ parameter of the URL query string is inserted into an %3Ca href=..%3E tag with no output encoding to facilitate the ‘Return to Magento Administration’ link.

 

Steps to reproduce:

1. Go to

http://magento/downloader/?return=%22%3Cscript%3E

alert(‘xss’)%3C/script%3E

2. You will be presented with a JavaScript alert dialog box containing ‘xss’

 

Solution.

The vendor has advised that the fix will be made available in the near future.

 

Discovered by.

Loukas Kalenderidis from SOS Labs.