US-CERT Technical Cyber Security Alert TA10-159A -- Adobe Flash, Reader, and Acrobat Vulnerability

09/06/10, US-CERT Technical Cyber Security Alert TA10-159A -- Adobe Flash, Reader, and Acrobat Vulnerability
From: US-CERT Technical Alerts <technical-alerts@us-cert.gov>

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To: technical-alerts@us-cert.gov
Subject: US-CERT Technical Cyber Security Alert TA10-159A -- Adobe Flash, Reader, and Acrobat Vulnerability
From: US-CERT Technical Alerts <technical-alerts@us-cert.gov>
Date: Tue, 8 Jun 2010 17:47:45 -0400
Delivered-to: on@cs.ait.ac.th
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                    National Cyber Alert System

              Technical Cyber Security Alert TA10-159A


Adobe Flash, Reader, and Acrobat Vulnerability

   Original release date: June 08, 2010
   Last revised: --
   Source: US-CERT


Systems Affected

     * Adobe Flash Player 10.0.45.2 and earlier 10.x versions
     * Adobe Flash Player 9.0.262 and earlier 9.x versions
     * Adobe Reader 9.3.2 and earlier 9.x versions
     * Adobe Acrobat 9.3.2 and earlier 9.x versions

     Other Adobe products that support Flash may also be vulnerable.


Overview

   According to Adobe, there is a vulnerability in Adobe Flash. This
   vulnerability affects Flash Player, Reader, Acrobat, and possibly
   other products that support Flash. A remote attacker could exploit
   this vulnerability to execute arbitrary code.


I. Description

   Adobe Security Advisory APSA10-01 describes a vulnerability in
   Adobe Flash that affects Flash Player, Reader, and Acrobat. It may
   also affect other products that independently support Flash, such
   as Photoshop, Photoshop Lightroom, Freehand MX, and Fireworks.

   An attacker could exploit this vulnerability by convincing a user
   to open specially crafted Flash content. Flash content is commonly
   hosted on a web page, but it can also be embedded in PDF and other
   documents or provided as a stand-alone file.

   As noted in APSA10-01, "There are reports that this vulnerability
   is being actively exploited in the wild against both Adobe Flash
   Player, and Adobe Reader and Acrobat."

   Additional information is available in US-CERT Vulnerability Note
   VU#486225.


II. Impact

   If a user opens specially crafted Flash content, a remote attacker
   may be able to execute arbitrary code.


III. Solution

 Update

   Adobe Security Advisory APSA10-01 suggests updating to the release
   candidate of Flash Player 10.1.

 Disable Flash in your web browser

   Uninstall Flash or restrict which sites are allowed to run Flash.
   To the extent possible, only run trusted Flash content on trusted
   domains. For more information, see Securing Your Web Browser.

 Disable Flash in Adobe Reader and Acrobat

   Disabling Flash in Adobe Reader will mitigate attacks that rely on
   Flash content embedded in a PDF file. Disabling 3D & Multimedia
   support does not directly address the vulnerability, but it does
   provide additional mitigation and results in a more user-friendly
   error message instead of a crash. To disable Flash and 3D &
   Multimedia support in Adobe Reader 9, delete, rename, or remove
   access to these files:

   Microsoft Windows

     "%ProgramFiles%\Adobe\Reader 9.0\Reader\authplay.dll"
     "%ProgramFiles%\Adobe\Reader 9.0\Reader\rt3d.dll"

   Apple Mac OS X

     "/Applications/Adobe Reader 9/Adobe
     Reader.app/Contents/Frameworks/AuthPlayLib.bundle"
     "/Applications/Adobe Reader 9/Adobe
     Reader.app/Contents/Frameworks/Adobe3D.framework"


   GNU/Linux (locations may vary among distributions)

     "/opt/Adobe/Reader9/Reader/intellinux/lib/libauthplay.so"
     "/opt/Adobe/Reader9/Reader/intellinux/lib/librt3d.so"

   File locations may be different for Adobe Acrobat or other Adobe
   products that include Flash and 3D & Multimedia support. Disabling
   these plugins will reduce functionality and will not protect
   against Flash content hosted on websites. Depending on the update
   schedule for products other than Flash Player, consider leaving
   Flash and 3D & Multimedia support disabled unless they are
   absolutely required.

 Prevent Internet Explorer from automatically opening PDF documents

   The installer for Adobe Reader and Acrobat configures Internet
   Explorer to automatically open PDF files without any user
   interaction. This behavior can be reverted to a safer option that
   prompts the user by importing the following as a .REG file:

     Windows Registry Editor Version 5.00

     [HKEY_CLASSES_ROOT\AcroExch.Document.7]
     "EditFlags"=hex:00,00,00,00

 Disable the display of PDF documents in the web browser

   Preventing PDF documents from opening inside a web browser will
   partially mitigate this vulnerability. If this workaround is
   applied, it may also mitigate future vulnerabilities.

   To prevent PDF documents from automatically being opened in a web
   browser, do the following:

     1. Open Adobe Acrobat Reader.
     2. Open the Edit menu.
     3. Choose the Preferences option.
     4. Choose the Internet section.
     5. Uncheck the "Display PDF in browser" checkbox.

 Disable JavaScript in Adobe Reader and Acrobat

   Disabling JavaScript provides some additional protection against
   attacks. Acrobat JavaScript can be disabled using the Preferences
   menu (Edit -> Preferences -> JavaScript; uncheck Enable Acrobat
   JavaScript).

 Enable DEP in Microsoft Windows

   Consider enabling Data Execution Prevention (DEP) in supported
   versions of Windows. DEP should not be treated as a complete
   workaround, but it can mitigate the execution of attacker-supplied
   code in some cases. Microsoft has published detailed technical
   information about DEP in Security Research & Defense blog posts
   "Understanding DEP as a mitigation technology" part 1 and part 2.
   Use of DEP should be considered in conjunction with the application
   of patches or other mitigations described in this document.

 Do not access PDF documents from untrusted sources

   Do not open unfamiliar or unexpected PDF documents, particularly
   those hosted on websites or delivered as email attachments. Please
   see Cyber Security Tip ST04-010.


IV. References

 * Security Advisory for Flash Player, Adobe Reader and Acrobat -
   <http://www.adobe.com/support/security/advisories/apsa10-01.html>

 * Adobe Labs - Flash Player 10 pre-release -
   <http://labs.adobe.com/technologies/flashplayer10/>

 * US-CERT Vulnerability Note VU#486225 -
   <http://www.kb.cert.org/vuls/id/486225>

 * Securing Your Web Browser -
   <http://www.us-cert.gov/reading_room/securing_browser/>

 * Understanding DEP as a mitigation technology part 1 -
   <http://blogs.technet.com/b/srd/archive/2009/06/05/understanding-dep-as-a-mitigation-technology-part-1.aspx>

 * Understanding DEP as a mitigation technology part 2 -
   <http://blogs.technet.com/b/srd/archive/2009/06/12/understanding-dep-as-a-mitigation-technology-part-2.aspx>

 ____________________________________________________________________

   The most recent version of this document can be found at:

     <http://www.us-cert.gov/cas/techalerts/TA10-159A.html>
 ____________________________________________________________________

   Feedback can be directed to US-CERT Technical Staff. Please send
   email to <cert@cert.org> with "TA10-159A Feedback VU#486225" in
   the subject.
 ____________________________________________________________________

   For instructions on subscribing to or unsubscribing from this
   mailing list, visit <http://www.us-cert.gov/cas/signup.html>.
 ____________________________________________________________________

   Produced 2010 by US-CERT, a government organization.

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 ____________________________________________________________________

Revision History

  June 08, 2010: Initial release


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