NSE LIB

Back to library
Official safe Vuln

ipmi-cipher-zero

IPMI 2.0 Cipher Zero Authentication Bypass Scanner. This module identifies IPMI 2.0 compatible systems that are vulnerable to an authentication bypass vulnerability through the use of cipher zero.

Ports

Any

Protocols

n/a

Attribution

Nmap Project

Usage

Copy the command and adjust the target or script arguments as needed. 

nmap -sU --script ipmi-cipher-zero -p 623 <host>
Script Source Toggle

The full script source is stored with this entry and is hidden by default to keep the page easier to scan. 

local ipmi = require "ipmi"
local nmap = require "nmap"
local shortport = require "shortport"
local stdnse = require "stdnse"
local string = require "string"
local vulns = require "vulns"

description = [[
  IPMI 2.0 Cipher Zero Authentication Bypass Scanner. This module identifies IPMI 2.0
  compatible systems that are vulnerable to an authentication bypass vulnerability
  through the use of cipher zero.
]]

---
-- @usage
-- nmap -sU --script ipmi-cipher-zero -p 623 <host>
--
-- @output
---PORT      STATE         SERVICE REASON
-- 623/udp open|filtered unknown no-response
-- | ipmi-cipher-zero:
-- |   VULNERABLE:
-- |   IPMI 2.0 RAKP Cipher Zero Authentication Bypass
-- |     State: VULNERABLE
-- |     Risk factor: High
-- |     Description:
-- |
-- |       The issue is due to the vendor shipping their devices with the
-- |       cipher suite '0' (aka 'cipher zero') enabled. This allows a
-- |       remote attacker to authenticate to the IPMI interface using
-- |       an arbitrary password. The only information required is a valid
-- |       account, but most vendors ship with a default 'admin' account.
-- |       This would allow an attacker to have full control over the IPMI
-- |       functionality.
-- |
-- |     References:
-- |       http://fish2.com/ipmi/cipherzero.html
-- |_      https://www.us-cert.gov/ncas/alerts/TA13-207A
--

author = "Claudiu Perta <claudiu.perta@gmail.com>"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"vuln", "safe"}

portrule = shortport.port_or_service(623, "asf-rmcp", "udp", {"open", "open|filtered"})

action = function(host, port)

  local vuln_table = {
    title = "IPMI 2.0 RAKP Cipher Zero Authentication Bypass",
    state = vulns.STATE.NOT_VULN,
    risk_factor = "High",
    description = [[

The issue is due to the vendor shipping their devices with the
cipher suite '0' (aka 'cipher zero') enabled. This allows a
remote attacker to authenticate to the IPMI interface using
an arbitrary password. The only information required is a valid
account, but most vendors ship with a default 'admin' account.
This would allow an attacker to have full control over the IPMI
functionality
    ]],
    references = {
      'http://fish2.com/ipmi/cipherzero.html',
      'https://www.us-cert.gov/ncas/alerts/TA13-207A',
    }
  }

  local report = vulns.Report:new(SCRIPT_NAME, host, port)

  local request = ipmi.session_open_cipher_zero_request()

  local socket = nmap.new_socket()
  socket:set_timeout(
      ((host.times and host.times.timeout) or 8) * 1000)
  socket:connect(host, port, "udp")

  -- Send 3 probes
  local tries = 3
  repeat
    socket:send(request)
    tries = tries - 1
  until tries == 0

  local status, reply = socket:receive()
  socket:close()

  if not status then
    stdnse.debug1(string.format("No response (%s)", reply))
    return nil
  end

  nmap.set_port_state(host, port, "open")

  local info = ipmi.parse_open_session_reply(reply)
  if info["session_payload_type"] == ipmi.PAYLOADS["RMCPPLUSOPEN_REP"] and info["error_code"] == 0 then
    vuln_table.state = vulns.STATE.VULN
  end

  return report:make_output(vuln_table)

end

Overview

IPMI 2.0 Cipher Zero Authentication Bypass Scanner. This module identifies IPMI 2.0 compatible systems that are vulnerable to an authentication bypass vulnerability through the use of cipher zero.