|TA09-051A: Adobe Acrobat and Reader Vulnerability
Original release date: February 20, 2009
Last revised: March 18, 2009
- Adobe Reader version 9 and earlier
- Adobe Acrobat (Professional, 3D, and Standard) version 9 and earlier
Adobe has released Security Advisory APSA09-01, which describes a buffer overflow vulnerability that occurs when Adobe Reader and Acrobat handle files with specially crafted JBIG2 streams. This vulnerability could allow a remote attacker to execute arbitrary code.
Adobe Security Advisory APSA09-01 describes a memory-corruption vulnerability that affects Adobe Reader and Acrobat. Further details are available in Vulnerability Note VU#905281.
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.
An attacker may be able to execute arbitrary code.
Adobe has released updates to address this issue. Users are encouraged to read Adobe Security Bulletins APSB09-03 and APSB09-04 and update vulnerable versions of Adobe Reader and Acrobat.
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
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. 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.
Feedback can be directed to US-CERT.
February 20, 2009: Initial release
March 11, 2009: Referenced new Adobe Security Bulletin
March 18, 2009: Added references to APSB09-04, fixed APSA/APSB text