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National Cyber Alert System
Cyber Security Alert SA09-286B
Multiple Vulnerabilities Affect Adobe Reader and Acrobat
Original release date:
Last revised: --
Source: US-CERT
Systems Affected
* Adobe Reader and Acrobat 9.1.3 and earlier 9.x versions
* Adobe Reader and Acrobat 8.1.6 and earlier 8.x versions
* Adobe Reader and Acrobat 7.1.3 and earlier 7.x versions
Overview
Adobe has released Security bulletin APSB09-15, which describes
multiple vulnerabilities affecting Adobe Reader and Acrobat.
Solution
Update
Adobe has released updates to address this issue. Users are
encouraged to read Adobe Security Bulletin APSB09-15 and update
vulnerable versions of Adobe Reader and Acrobat.
Enable Data Execution Prevention (DEP) in Microsoft Windows
Consider enabling Data Execution Prevention (DEP) in supported
versions of Windows. Though it doesn't completely resolve the
problem, DEP can hinder the execution of attacks 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. You should consider using
DEP along with the patches and other mitigations described in this
document.
Disable JavaScript in Adobe Reader and Acrobat
Disabling JavaScript may prevent some exploits. Acrobat JavaScript
can be disabled using the Preferences menu (Edit -> Preferences ->
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 your interaction.
However, you can set up a safer option that prompts the you 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 your Web browser
Preventing PDF documents from opening inside your Web browser will
partially mitigate this vulnerability. By applying this workaround,
you may also lessen the possibility of 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. 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 Web sites or delivered as email attachments. Please
see Cyber Security Tip ST04-010.
Description
Adobe Security Advisory APSB09-15 describes a number of
vulnerabilities affecting Adobe Reader and Acrobat. An attacker
could exploit these vulnerabilities by convincing a user to open a
specially crafted PDF file.
These vulnerabilities could allow a remote attacker to take
control of your computer or cause it to crash.
References
* APSB09-15 Security Advisory for Adobe Reader and Acrobat -
<http://www.adobe.com/support/security/bulletins/apsb09-15.html>
* Understanding DEP as a mitigation technology part 1 -
<http://blogs.technet.com/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/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/alerts/SA09-286B.html>
____________________________________________________________________
Feedback can be directed to US-CERT Technical Staff. Please send
email to <cert@cert.org> with "SA09-286B Feedback VU#257117" in
the subject.
____________________________________________________________________
For instructions on subscribing to or unsubscribing from this
mailing list, visit <http://www.us-cert.gov/cas/signup.html>.
____________________________________________________________________
Produced 2009 by US-CERT, a government organization.
Terms of use:
<http://www.us-cert.gov/legal.html>
____________________________________________________________________
Revision History
October 13, 2009: Initial release
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