[MajorSecurity Advisory #65]Motorola Milestone Smartphone Denial of Service

[david () majorsecurity info]

[MajorSecurity Advisory #65]Motorola Milestone Smartphone Denial of Service

Details
============
Product: Motorola Milestone(Droid) Smartphone
Security-Risk: low
Remote-Exploit: yes
Vendor-URL: http://www.motorola.com/
Vendor-Status: informed
Advisory-Status: published on 02-02-2010

Credits
============
Discovered by: David Vieira-Kurz
http://www.majorsecurity.info

Affected Products:
============
Motorola Milestone(Droid) smartphone Browser with following useragent:
Mozilla/5.0 (Linux; U; Android 2.0; de-de; Milestone Build/SHOLS_U2_01.03.1) AppleWebKit/530.17 (KHTML, like Gecko) 
Version/4.0 Mobile Safari/530.17

Original Advisory:
============
http://www.majorsecurity.info/index_2.php?adv=major_rls65

Introduction
============
The Motorola Milestone(droid) is a smartphone produced by Motorola based on the android operation system.

More Details
============
A remotely exploitable vulnerability has been found in the JavaScript Engine of the MobileSafari Browser(based on 
Webkit Engine) used on the Motorola Milestone(droid) smartphone.
In detail, the following flaw was determined:
The Motorola Milestone(Droid) is prone to a denial of service vulnerability when parsing certain HTML content. 
This is possible due to a failure in handling exceptional conditions.
This issue is caused by a memory corruption error when handling javascript elements,
which could be exploited by remote attackers to crash the browser by tricking a user into visiting a specially crafted 
web page.
This issue can NOT be lead to remote code execution, so that the potential security risk is rated low.

The exploit has been tested on a Motorola Milestone(Droid) using following useragent:

Mozilla/5.0 (Linux; U; Android 2.0; de-de; Milestone Build/SHOLS_U2_01.03.1) AppleWebKit/530.17 (KHTML, like Gecko) 
Version/4.0 Mobile Safari/530.17

Proof of Concept:
============
   <script>
    var overloadtag = "<marquee>";
    for(x=1;x<=9999999999999;x++){
      document.write(overloadtag);
    }
   &lt;/script&gt;

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