-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 National Cyber Alert System Technical Cyber Security Alert TA09-286B Adobe Reader and Acrobat Vulnerabilities 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. I. Description Adobe Security Advisory APSB09-15 describes a number of vulnerabilities affecting Adobe Reader and Acrobat. These vulnerabilities affect Reader 9.1.3 and earlier 9.x versions, 8.1.6 and earlier 8.x versions, and 7.1.3 and earlier 7.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 is available for multiple Web browsers and operating systems, which can automatically open PDF documents hosted on a Web site. These vulnerabilities are being actively exploited. II. Impact These vulnerabilities allow a remote attacker to execute arbitrary code, write arbitrary files or folders to the filesystem, escalate local privileges, or cause a denial of service on an affected system as the result of a user opening a malicious PDF document. III. 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. DEP should not be treated as a complete workaround, but DEP can mitigate the execution of attacker-supplied code 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. Use of DEP should be considered in conjunction with the application of patches or other mitigations described in this document. 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 (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 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 [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. 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. IV. References * APSB09-15 Security Advisory for Adobe Reader and Acrobat - * Understanding DEP as a mitigation technology part 1 - * Understanding DEP as a mitigation technology part 2 - ____________________________________________________________________ The most recent version of this document can be found at: ____________________________________________________________________ Feedback can be directed to US-CERT Technical Staff. Please send email to with "TA09-286B Feedback VU#257117" in the subject. ____________________________________________________________________ For instructions on subscribing to or unsubscribing from this mailing list, visit . ____________________________________________________________________ Produced 2009 by US-CERT, a government organization. Terms of use: ____________________________________________________________________ Revision History October 13, 2009: Initial release -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) iQEVAwUBStTr99ucaIvSvh1ZAQJsWwf+Pttkav58Zf/kBUMI2RFmHEc92fjtPZND GzSRC+Aul2Hyb+jsQfHiAbrLB6gaoGEzgafA34voE9ukh4I5Oi4czfF7vEp4rVzi U4TCasgadEzck5UdPPjJ4CgpeRYvgGAaY9Qupc5BydA9rkgBpvFRGkckC42n/jJb SShVnhaO5eqXSUJsxVRtwtLvcjot5A3HAuUE9Ni27kBdpMB85S4nZQE6XDwlI717 5jExXpy2IG6g+fkDEOxfWjWtyL/XJyIfRg8PTeqz40p0gHxdzJpUKLPhcrOFKCoU RgBbu3RFjeKA6LUq/vwrvVHNwVlmJc+SPf0gTkEccd/5GhCeu0OCUA== =UhqI -----END PGP SIGNATURE-----