[Full-disclosure] Computer Terrorism (UK) :: Incident Response Centre - Adobe/Macromedia Flash Player Vulnerability

[CTUK :: Incident Response Centre]

Computer Terrorism  (UK) :: Incident Response Centre

www.computerterrorism.com

Security Advisory: CT12-09-2006


============================================
Adobe/Macromedia Flash Player - Remote Code Execution
============================================

Advisory Date: 12th, September 2006

Severity: Critical
Impact: Remote System Access
Solution Status: Vendor Patch

CVE Reference:  CVE-2006-3311



Affected Software
=================

Adobe Flash Player 8.0.24.0 and earlier versions
Adobe Flash Professional 8, Flash Basic
Adobe Flash MX 2004
Adobe Flex 1.5

Note: All OS Platforms are vulnerable


1. OVERVIEW
===========

Adobe/Macromedia Flash Player is the world's most ubiquitous Browser plug-in 
for Microsoft, Mozilla and Apple technologies. The plug-in claims to 
facilitate
high-impact web interfaces and interactive online advertising for circa 98% 
of desktops globally.

Unfortunately, it transpires that Adobe Flash Player is prone to a remote 
arbitrary code execution vulnerability, that allows an attacker to gain 
control of a target system through the simple invocation of a maliciously 
constructed web page.


2. TECHNICAL NARRATIVE
======================

The vulnerability originates out of Flash's failure to sufficiently handle 
large dynamically generated strings at run time. As a result, it is possible 
(using rudimentary Action Script) to create a .swf movie in such a way that 
when processed by the Plug-in, will overwrite system memory at an explicit 
location.

More specifically, the aforementioned location can (with a certain degree of 
accuracy) be attacker controlled via the direct manipulation of the overall 
length of the generated string.

The net result is that of a partially controllable condition, which opens 
the door to a multitude of differing exploitation vectors, including but not 
limited to heap/stack overwrites, and/or 3rd party race conditions.


3. EXPLOITATION
===============

Computer Terrorism (UK) can confirm the un-disclosed production of a 
reliable multi-platform & multi-browser Web based Proof-Of-Concept (PoC). 
Such an
exploit could be used in a web-based attack scenario, where unsuspecting 
users are lured to a maliciously constructed website.

Users that have not already done so are strongly advised to upgrade to the 
latest version of Flash Player or apply the appropriate fix for their 
particular version.


4. VENDOR RESPONSE
==================

The vendor security bulletin and corresponding patches are available at the
following location:

http://www.adobe.com/go/apsb06-11/


5. DISCLOSURE ANALYSIS
======================

12/05/2006  Preliminary Vendor notification.
18/05/2006  Vulnerability confirmed in pre-release Flash 9, and earlier 
versions
28/06/2006  Flash Player 9 released (Fixed)
31/07/2006  Public Disclosure Deferred by Vendor.
12/09/2006  Coordinated public release.

Total Time to Fix: 4 months (123 days)


6. CREDIT
=========

The vulnerability was discovered by Stuart Pearson of Computer Terrorism




===================
About Computer Terrorism
===================

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