US-CERT Technical Cyber Security Alert TA06-053A -- Apple Mac OS X Safari Command Execution Vulnerability




-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1



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@xxxxxxxx> 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







-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.1 (GNU/Linux)

iQEVAwUBQ/zKN30pj593lg50AQJgoQf/ZajorZz/6quzA40dc8cLxIBT70xcClH5
CKDN5nMXl1mRYYkDPF07GbcWL3lWarW5Hif0OiZfazaGNC3p9v4ZxDx/dW/ZmsYo
eDznsNWNphKB6yBSIbOUSfGyh/I7pQlG3qxXRWDTA9nVK12KIkvAAoPTgBe40obu
+x58gK5/ib4d+dEZ8F9SbO7/syYtcAzfzS2HrBYhG1lWWLYTaNC3hyI2nXF5lNV/
ymwaPv0ivAB9rpalus+KkajjiV5+J08dj+1JwgwcSpvuNMQ5c/8RCIILP+1bR+CL
lScvGuSRYk4S0QI9nmCDvwD52sluiwp2VO1atTQ1zcgpwhvLRGo3DQ==
=P2/3
-----END PGP SIGNATURE-----



Relevant Pages