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iDefense Security Advisory 08.09.11 - Flash Player Integer Overflow

iDefense Security Advisory 08.09.11 - Flash Player Integer Overflow
Posted Aug 11, 2011
Authored by iDefense Labs, Vitaliy Toropov | Site idefense.com

iDefense Security Advisory 08.09.11 - Remote exploitation of an integer overflow vulnerability in Adobe Systems Inc.'s Flash Player could allow an attacker to execute arbitrary code with the privileges of the current user. During the allocation of an array within a certain internal ActionScript function, a size calculation may cause an integer value to overflow. This condition may lead to the bounds of an undersized array being overflown during a memory copy operation. This can result in arbitrary code execution.

tags | advisory, remote, overflow, arbitrary, code execution
advisories | CVE-2011-2416, CVE-2011-2136
SHA-256 | ad96594bfd0771b3e3c7af67f19881e8a68ee7601ad242799dc2d78119f54b9b

iDefense Security Advisory 08.09.11 - Flash Player Integer Overflow

Change Mirror Download
iDefense Security Advisory 08.09.11
http://labs.idefense.com/intelligence/vulnerabilities/
Aug 09, 2011

I. BACKGROUND

Adobe Flash Player is an application for viewing animations and movies
using computer programs such as a Web browser; in common usage, Flash
lets you put animation and movies on a website. Flash Player runs SWF
files that can be created by the Adobe Flash authoring tool, by Adobe
Flex, or by a number of other Macromedia and third-party tools. For more
information, please visit following website:

http://www.adobe.com/products/flashplayer/

II. DESCRIPTION

Remote exploitation of an integer overflow vulnerability in Adobe
Systems Inc.'s Flash Player could allow an attacker to execute arbitrary
code with the privileges of the current user.

During the allocation of an array within a certain internal ActionScript
function, a size calculation may cause an integer value to overflow.
This condition may lead to the bounds of an undersized array being
overflown during a memory copy operation. This can result in arbitrary
code execution.

III. ANALYSIS

Exploitation of this vulnerability results in the execution of arbitrary
code with the privileges of the user viewing the Web page. To exploit
this vulnerability, a targeted user must load a malicious Flash file
created by an attacker. An attacker typically accomplishes this via
social engineering or injecting content into a compromised, trusted
site.

IV. DETECTION

The following Adobe Products are vulnerable: <ul> <li> Adobe Flash
Player 10.3.181.36 and earlier versions for Windows, Macintosh, Linux
and Solaris operating systems </li> <li> Adobe Flash Player 10.3.185.25
and earlier versions for Android </li> <li> Adobe AIR 2.7 and earlier
versions for Windows, Macintosh and Android </li> </ul>

V. WORKAROUND

Disable Flash Player plugin by restricting access to Flash Player files,
which is usually under C:\WINDOWS\system32\Macromed\Flash\

VI. VENDOR RESPONSE

Adobe has released a fix which addresses this issue. Information about
downloadable vendor updates can be found by clicking on the URLs shown.

http://www.adobe.com/support/security/bulletins/apsb11-21.html

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2011-2416 and CVE-2011-2136 to this issue. This is a candidate
for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.

VIII. DISCLOSURE TIMELINE

04/27/2011 Initial Vendor Notification
04/27/2011 Vendor Reply
08/09/2011 Coordinated Public Disclosure

IX. CREDIT

This vulnerability was reported to iDefense by Vitaliy Toropov.

Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php

Free tools, research and upcoming events
http://labs.idefense.com/

X. LEGAL NOTICES

Copyright © 2011 Verisign

Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically, please
e-mail customerservice@idefense.com for permission.

Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect,
or consequential loss or damage arising from use of, or reliance on,
this information.
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