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For those of you who may not have noticed, Adobe pushed up their
quarterly patches for Acrobat/Acrobat Reader by a week.
Please be advised that this update addresses at least one security
vulnerability for which there is a known exploits being used by attackers.
- -------- Original Message --------
Subject: US-CERT Technical Cyber Security Alert TA10-279A -- Adobe
Reader and Acrobat Affected by Multiple Vulnerabilities
Date: Wed, 6 Oct 2010 09:35:41 -0400
From: US-CERT Technical Alerts <[hidden email]>
Organization: US-CERT - +1 202-205-5266
To: [hidden email]
National Cyber Alert System
Technical Cyber Security Alert TA10-279A
Adobe Reader and Acrobat Affected by Multiple Vulnerabilities
Original release date: October 06, 2010
Last revised: --
* Adobe Reader 9.3.4 and earlier versions for Windows, Macintosh,
* Adobe Acrobat 9.3.4 and earlier versions for Windows and Macintosh
* Adobe Reader 8.2.4 and earlier versions for Windows, Macintosh,
* Adobe Acrobat 8.2.4 and earlier versions for Windows and Macintosh
Adobe has released Security Bulletin APSB10-21, which describes
multiple vulnerabilities affecting Adobe Reader and Acrobat.
Adobe Security Bulletin APSB10-21 describes a number of
vulnerabilities affecting Adobe Reader and Acrobat. These
vulnerabilities affect Reader and Acrobat 9.3.4, earlier 9.x
versions, 8.2.4, and earlier 8.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
Additional information is available in US-CERT Vulnerability Note
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
Adobe has released updates to address this issue. Users are
encouraged to read Adobe Security Bulletin APSB10-21 and update
vulnerable versions of Adobe Reader and Acrobat.
Adobe provides a framework to blacklist specific JavaScipt APIs. If
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
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.
* Security update available for Adobe Reader and Acrobat -
* US-CERT Vulnerability Note VU#491991 -
The most recent version of this document can be found at:
Feedback can be directed to US-CERT Technical Staff. Please send
email to <[hidden email]> with "TA10-279A Feedback VU#491991" in
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.
October 06, 2010: Initial release
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