Computer Terrorism (UK) :: Incident Response Centre - Adobe/Macromedia Flash Player Vulnerability Sep 12 2006 07:00PM
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Computer Terrorism (UK) :: Incident Response Centre


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 and earlier versions

Adobe Flash Professional 8, Flash Basic

Adobe Flash MX 2004

Adobe Flex 1.5

Note: All OS Platforms are vulnerable



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.



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


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.



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.



The vendor security bulletin and corresponding patches are available at the

following location:




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)



The vulnerability was discovered by Stuart Pearson of Computer Terrorism (UK) Ltd


About Computer Terrorism


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