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                        National Cyber Alert System

                Technical Cyber Security Alert TA06-053A


Apple Mac OS X Safari Command Execution Vulnerability

   Original release date: February 22, 2006
   Last revised: --
   Source: US-CERT


Systems Affected

   Apple Safari running on Mac OS X


Overview

   A file type determination vulnerability in Apple Safari could allow a
   remote attacker to execute arbitrary commands on a vulnerable system.


I. Description

   Apple Safari is a web browser that comes with Apple Mac OS X. The
   default configuration of Safari allows it to automatically "Open
   'safe' files after downloading." Due to this default configuration and
   inconsistencies in how Safari and OS X determine which files are
   "safe," Safari may execute arbitrary shell commands as the result of
   viewing a specially crafted web page.

   Details are available in the following Vulnerability Note:

   VU#999708 - Apple Safari may automatically execute arbitrary shell
   commands


II. Impact

   A remote, unauthenticated attacker could execute arbitrary commands
   with the privileges of the user running Safari. If the user is logged
   on with administrative privileges, the attacker could take complete
   control of an affected system.


III. Solution

   Since there is no known patch for this issue at this time, US-CERT is
   recommending a workaround.

Workaround

Disable "Open 'safe' files after downloading"

   Disable the option to "Open 'safe' files after downloading," as
   specified in the document "Securing Your Web Browser."


Appendix A. References

     * US-CERT Vulnerability Note VU#999708 -
       <http://www.kb.cert.org/vuls/id/999708>

     * Securing Your Web Browser -
       <http://www.us-cert.gov/reading_room/securing_browser/#sgeneral>

     * Apple - Mac OS X - Safari RSS -
       <http://www.apple.com/macosx/features/safari/>


 ____________________________________________________________________

   The most recent version of this document can be found at:

     <http://www.us-cert.gov/cas/techalerts/TA06-053A.html>
 ____________________________________________________________________

   Feedback can be directed to US-CERT Technical Staff. Please send
   email to <cert@cert.org> with "TA06-053A Feedback VU#999708" in the
   subject.
 ____________________________________________________________________

   For instructions on subscribing to or unsubscribing from this
   mailing list, visit <http://www.us-cert.gov/cas/signup.html>.
 ____________________________________________________________________

   Produced 2006 by US-CERT, a government organization.

   Terms of use:

     <http://www.us-cert.gov/legal.html>
 ____________________________________________________________________


Revision History

   Feb 22, 2006: Initial release


    




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