- Adobe Reader 9.3.1 and earlier 9.x versions
- Adobe Reader 8.2.1 and earlier versions
- Adobe Acrobat 9.3.1 and earlier 9.x versions
- Adobe Acrobat 8.2.1 and earlier versions
Adobe has released Security Bulletin APSB10-09, which describes multiple vulnerabilities affecting Adobe Reader and Acrobat.
Adobe Security Bulletin APSB10-09 describes a number of vulnerabilities affecting Adobe Reader and Acrobat. These vulnerabilities affect Reader and Acrobat 9.3.1 and earlier 9.x versions, and 8.2.1 and earlier versions.
An attacker could exploit these vulnerabilities by convincing a user to open a specially crafted PDF file. The Adobe Reader browser plug-in is available for multiple web browsers and operating systems, which can automatically open PDF documents hosted on a website.
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 document.
Adobe has released updates to address this issue. Users are encouraged to read Adobe Security Bulletin APSB10-09 and update vulnerable versions of Adobe Reader and Acrobat.
Adobe does not offer standalone installers of Reader or Acrobat versions 9.3.2 or 8.2.2. For a fresh installation, first install Adobe Reader 9.3.0 or 8.2.0 and then use the automatic update feature or install the appropriate update referenced in APSB10-09.
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
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.
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.
April 13, 2010: Initial release
April 14, 2010: Updated
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