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                    National Cyber Alert System

              Technical Cyber Security Alert TA09-161A


Adobe Acrobat and Reader Vulnerabilities

   Original release date: June 10, 2009
   Last revised: --
   Source: US-CERT


Systems Affected

     * Adobe Reader versions 9.1.1 and earlier, 8.1.5 and earlier, and 7.1.2 and earlier
     * Adobe Acrobat (Standard, Professional, and 3D) versions 9.1.1 and earlier, 8.1.5 and earlier, and 7.1.2 and earlier


Overview

   Adobe has released Security Bulletin APSB09-07, which describes
   several buffer overflow vulnerabilities that could allow a remote
   attacker to execute arbitrary code.


I. Description

   Adobe Security Bulletin APSB09-07 describes several
   memory-corruption vulnerabilities that affect Adobe Reader and
   Acrobat. Some of these vulnerabilities occur when Adobe Reader and
   Acrobat handle files with specially crafted JBIG2 streams.   An
   attacker could exploit these vulnerabilities by convincing a user
   to load a specially crafted Adobe Portable Document Format (PDF)
   file. Acrobat integrates with popular web browsers, and visiting a
   website is usually sufficient to cause Acrobat to load PDF content.


II. Impact

   An attacker may be able to execute arbitrary code.


III. Solution

   Update
   
   Adobe has released updates to address this issue. Users are
   encouraged to read Adobe Security Bulletin APSB09-07 and update
   vulnerable versions of Adobe Reader and Acrobat.
   
   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:
   
   * Open the Edit menu.
   * Select Preferences.
   * Choose JavaScript.
   * Un-check Enable Acrobat JavaScript.
    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 the safer option of
   prompting 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. This workaround may also
   mitigate future vulnerabilities.
   
   To prevent PDF documents from automatically being opened in a web
   browser, do the following:
   
   * Open Adobe Acrobat Reader.
   * Open the Edit menu.
   * Choose the Preferences option.
   * Choose the Internet section.
   * Un-check the Display PDF in browser check box.
    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. See
   Cyber Security Tip ST04-010.
   
   Additional workarounds are available in Vulnerability Note
   VU#568153.


IV. References

 * Adobe Security Bulletin APSB09-07 -
   <http://www.adobe.com/support/security/bulletins/apsb09-07.html>

 * Vulnerability Note VU#568153 -
   <http://www.kb.cert.org/vuls/id/568153>

 ____________________________________________________________________

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

     <http://www.us-cert.gov/cas/techalerts/TA09-161A.html>
 ____________________________________________________________________

   Feedback can be directed to US-CERT Technical Staff. Please send
   email to <cert@cert.org> with "TA09-161A Feedback VU#568153" in
   the subject.
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   Produced 2009 by US-CERT, a government organization.

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Revision History
  
  June 10, 2009: Initial release


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