description = [[
Checks if a VNC server is vulnerable to the RealVNC authentication bypass
(CVE-2006-2369).
]]
author = "Brandon Enright"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
---
-- @output
-- PORT STATE SERVICE VERSION
-- 5900/tcp open vnc VNC (protocol 3.8)
-- |_realvnc-auth-bypass: Vulnerable
categories = {"auth", "default", "vuln", "safe"}
require "shortport"
portrule = shortport.port_or_service(5900, "vnc")
action = function(host, port)
local socket = nmap.new_socket()
local result
local status = true
socket:connect(host, port)
status, result = socket:receive_lines(1)
if (not status) then
socket:close()
return
end
socket:send("RFB 003.008\n")
status, result = socket:receive_bytes(2)
if (not status or result ~= "\001\002") then
socket:close()
return
end
socket:send("\001")
status, result = socket:receive_bytes(4)
if (not status or result ~= "\000\000\000\000") then
socket:close()
return
end
socket:close()
return "Vulnerable"
end
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