US-CERT Technical Cyber Security Alert TA11-166A -- Adobe Updates for Multiple Vulnerabilities




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National Cyber Alert System

Technical Cyber Security Alert TA11-166A


Adobe Updates for Multiple Vulnerabilities

Original release date: June 15, 2011
Last revised: --
Source: US-CERT


Systems Affected

* Adobe Reader X (10.0.1) and earlier 10.x versions for Windows
* Adobe Reader X (10.0.3) and earlier 10.x versions for Macintosh
* Adobe Reader 9.4.3 and earlier 9.x versions for Windows and Macintosh
* Adobe Reader 8.2.6 and earlier 8.x versions for Windows and Macintosh
* Adobe Acrobat X (10.0.3) and earlier 10.x versions for Windows and Macintosh
* Adobe Acrobat 9.4.3 and earlier 9.x versions for Windows and Macintosh
* Adobe Acrobat 8.2.6 and earlier 8.x versions for Windows and Macintosh
* Shockwave Player 11.5.9.620 and earlier versions for Windows and Macintosh.
* Adobe Flash Player 10.3.181.23 and earlier versions for Windows, Macintosh, Linux and Solaris operating systems
* Adobe Flash Player 10.3.185.23 and earlier versions for Android


Overview

Adobe has released Security Bulletin APSB11-16, which describes
multiple vulnerabilities affecting Adobe Reader and Acrobat.

Adobe has released Security Bulletin APSB11-17, which describes
multiple vulnerabilities affecting Adobe Shockwave Player.

Adobe has released Security Bulletin APSB11-18, which describes
multiple vulnerabilities affecting Adobe Flash Player.


I. Description

Adobe Security Bulletin APSB11-16 describes a number of
vulnerabilities affecting Adobe Reader and Acrobat. These
vulnerabilities affect Reader and Acrobat 9.3.4, earlier 9.x
versions, 8.2.6, and earlier 8.x versions. These vulnerabilities
also affect Reader X and Acrobat X 10.0.3, 10.0.1, and earlier 10.x
versions.

An attacker could exploit these vulnerabilities by convincing a
user to open a specially crafted PDF file. The Adobe Reader browser
plug-in, which can automatically open PDF documents hosted on a
website, is available for multiple web browsers and operating
systems.

Adobe Security Bulletin APSB11-17 describes a number of
vulnerabilities affecting Adobe Shockwave Player. These
vulnerabilities affect Shockwave Player 11.5.9.620 and earlier
versions.

An attacker could exploit this vulnerability by convincing a user
to open specially crafted Shockwave content. Shockwave 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.

Adobe Security Bulletin APSB11-18 describes a number of
vulnerabilities affecting Adobe Flash Player. These vulnerabilities
affect Flash Player 10.3.181.23 and earlier versions for Windows,
Macintosh, Linux and Solaris operating systems. These
vulnerabilities also affect Flash Player 10.3.185.23 and earlier
versions for Android.

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.


II. Impact

These vulnerabilities could allow a remote attacker to execute
arbitrary code, write arbitrary files or folders to the file
system, escalate local privileges, or cause a denial of service on
an affected system as the result of a user opening a malicious PDF
file.

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

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


III. Solution

Update Reader

Adobe has released updates to address this issue. Users are
encouraged to read Adobe Security Bulletin APSB11-16 and update
vulnerable versions of Adobe Reader and Acrobat.

Update Adobe Shockwave Player

Adobe has released updates to address this issue. Users are
encouraged to read Adobe Security Bulletin APSB11-17 and update
vulnerable versions of Adobe Shockwave Player.

Update Adobe Flash Player

Adobe has released updates to address this issue. Users are
encouraged to read Adobe Security Bulletin APSB11-18 and update
vulnerable versions of Adobe Adobe Flash Player.

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.

Disable JavaScript in Adobe Reader and Acrobat

Disabling JavaScript may prevent some exploits from resulting in
code execution. Acrobat JavaScript can be disabled using the
Preferences menu (Edit -> Preferences -> JavaScript; uncheck Enable
Acrobat JavaScript).

Adobe provides a framework to blacklist specific JavaScipt APIs. If
JavaScript must be enabled, this feature may be useful when
specific APIs are known to be vulnerable or used in attacks.

Prevent Internet Explorer from automatically opening PDF files

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 files in the web browser

Preventing PDF files 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 files 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.

Do not access PDF files from untrusted sources

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


IV. References

* Security update available for Adobe Reader and Acrobat -
<http://www.adobe.com/support/security/bulletins/apsb11-16.html>

* Adobe Reader and Acrobat JavaScript Blacklist Framework -
<http://kb2.adobe.com/cps/504/cpsid_50431.html>

* Security update available for Adobe Flash Player -
<http://www.adobe.com/support/security/bulletins/apsb11-18.html>

* Security update available for Adobe Shockwave Player -
<http://www.adobe.com/support/security/bulletins/apsb11-17.html>

____________________________________________________________________

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

<http://www.us-cert.gov/cas/techalerts/TA11-166A.html>
____________________________________________________________________

Feedback can be directed to US-CERT Technical Staff. Please send
email to <cert@xxxxxxxx> with "TA11-166A Feedback" in
the subject.
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Produced 2011 by US-CERT, a government organization.

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Revision History

June 15, 2011: Initial release


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