http-cross-domain-policy
NSE detection rule by Unknown · Same as Nmap--See https://nmap.org/book/man-legal.html
Checks the cross-domain policy file (/crossdomain.xml) and the client-acces-policy file (/clientaccesspolicy.xml)
in web applications and lists the trusted domains. Overly permissive settings enable Cross Site Request Forgery
attacks and may allow attackers to access sensitive data. This script is useful to detect permissive
configurations and possible domain names available for purchase to exploit the application.
The script queries instantdomainsearch.com to lookup the domains. This functionality is
turned off by default, to enable it set the script argument http-cross-domain-policy.domain-lookup.
References:
* http://sethsec.blogspot.com/2014/03/exploiting-misconfigured-crossdomainxml.html
* http://gursevkalra.blogspot.com/2013/08/bypassing-same-origin-policy-with-flash.html
* https://www.adobe.com/devnet/articles/crossdomain_policy_file_spec.html
* https://www.adobe.com/devnet-docs/acrobatetk/tools/AppSec/CrossDomain_PolicyFile_Specification.pdf
* https://www.owasp.org/index.php/Test_RIA_cross_domain_policy_%28OTG-CONFIG-008%29
* http://acunetix.com/vulnerabilities/web/insecure-clientaccesspolicy-xml-file
local http = require "http"
local stdnse = require "stdnse"
local vulns = require "vulns"
local nmap = require "nmap"
local shortport = require "shortport"
local table = require "table"
local tableaux = require "tableaux"
local string = require "string"
local slaxml = require "slaxml"
description = [[
Checks the cross-domain policy file (/crossdomain.xml) and the client-acces-policy file (/clientaccesspolicy.xml)
in web applications and lists the trusted domains. Overly permissive settings enable Cross Site Request Forgery
attacks and may allow attackers to access sensitive data. This script is useful to detect permissive
configurations and possible domain names available for purchase to exploit the application.
The script queries instantdomainsearch.com to lookup the domains. This functionality is
turned off by default, to enable it set the script argument http-cross-domain-policy.domain-lookup.
References:
* http://sethsec.blogspot.com/2014/03/exploiting-misconfigured-crossdomainxml.html
* http://gursevkalra.blogspot.com/2013/08/bypassing-same-origin-policy-with-flash.html
* https://www.adobe.com/devnet/articles/crossdomain_policy_file_spec.html
* https://www.adobe.com/devnet-docs/acrobatetk/tools/AppSec/CrossDomain_PolicyFile_Specification.pdf
* https://www.owasp.org/index.php/Test_RIA_cross_domain_policy_%28OTG-CONFIG-008%29
* http://acunetix.com/vulnerabilities/web/insecure-clientaccesspolicy-xml-file
]]
---
-- @usage nmap --script http-cross-domain-policy <target>
-- @usage nmap -p 80 --script http-cross-domain-policy --script-args http-cross-domain-policy.domain-lookup=true <target>
--
-- @output
-- PORT STATE SERVICE REASON
-- 8080/tcp open http-proxy syn-ack
-- | http-cross-domain-policy:
-- | VULNERABLE:
-- | Cross-domain policy file (crossdomain.xml)
-- | State: VULNERABLE
-- | A cross-domain policy file specifies the permissions that a web client such as Java, Adobe Flash, Adobe Reader,
-- | etc. use to access data across different domains. A client acces policy file is similar to cross-domain policy
-- | but is used for M$ Silverlight applications. Overly permissive configurations enables Cross-site Request
-- | Forgery attacks, and may allow third parties to access sensitive data meant for the user.
-- | Check results:
-- | /crossdomain.xml:
-- | <cross-domain-policy>
-- | <allow-access-from domain="*.example.com"/>
-- | <allow-access-from domain="*.exampleobjects.com"/>
-- | <allow-access-from domain="*.example.co.in"/>'
-- | </cross-domain-policy>
-- | /clientaccesspolicy.xml:
-- | <?xml version="1.0" encoding="utf8"?>
-- | </accesspolicy>
-- | <crossdomainaccess>
-- | <policy>
-- | <allowfrom httprequestheaders="SOAPAction">
-- | <domain uri="*"/>
-- | <domain uri="*.example.me"/>
-- | <domain uri="*.exampleobjects.me"/>
-- | </allowfrom>
-- | <granto>
-- | <resource path="/" includesubpaths="true"/>
-- | </granto>
-- | </policy>
-- | </crossdomainaccess>
-- | </accesspolicy>
-- | Extra information:
-- | Trusted domains:example.com, exampleobjects.com, example.co.in, *, example.me, exampleobjects.me
-- | Use the script argument 'domain-lookup' to find trusted domains available for purchase
-- | References:
-- | http://gursevkalra.blogspot.com/2013/08/bypassing-same-origin-policy-with-flash.html
-- | http://sethsec.blogspot.com/2014/03/exploiting-misconfigured-crossdomainxml.html
-- | https://www.owasp.org/index.php/Test_RIA_cross_domain_policy_%28OTG-CONFIG-008%29
-- | http://acunetix.com/vulnerabilities/web/insecure-clientaccesspolicy-xml-file
-- | https://www.adobe.com/devnet-docs/acrobatetk/tools/AppSec/CrossDomain_PolicyFile_Specification.pdf
-- |_ https://www.adobe.com/devnet/articles/crossdomain_policy_file_spec.html
--
--
-- @args http-cross-domain-policy.domain-lookup Boolean to check domain availability. Default:false
--
-- @xmloutput
-- <elem key="title">Cross-domain and Client Access policies.</elem>
-- <elem key="state">VULNERABLE</elem>
-- <table key="description">
-- <elem>A cross-domain policy file specifies the permissions that a
-- web client such as Java, Adobe Flash, Adobe Reader, etc. use to
-- access data across different domains. A client acces policy file
-- is similar to cross-domain policy but is used for M$ Silverlight
-- applications. Overly permissive configurations enables Cross-site
-- Request Forgery attacks, and may allow third parties to access
-- sensitive data meant for the user.</elem>
-- </table>
-- <table key="check_results">
-- <table>
-- <elem key="name">/crossdomain.xml</elem>
-- <elem key="body"><cross-domain-policy>
-- <allow-access-from domain="*.example.com"/>
-- <allow-access-from domain="*.exampleobjects.com"/>
-- <allow-access-from domain="*.example.co.in"/>'
-- </cross-domain-policy></elem>
-- </table>
-- <table>
-- <elem key="name">/clientaccesspolicy.xml</elem>
-- <elem key="body"><?xml version="1.0" encoding="utf8"?>
-- </accesspolicy> <crossdomainaccess> <policy>
-- <allowfrom httprequestheaders="SOAPAction"> <domain
-- uri="*"/> <domain uri="*.example.me"/> <domain
-- uri="*.exampleobjects.me"/> </allowfrom> <granto>
-- <resource path="/" includesubpaths="true"/>
-- </granto> </policy> </crossdomainaccess>
-- </accesspolicy></elem>
-- </table>
-- </table>
-- <table key="extra_info">
-- <elem>Trusted domains:example.com, exampleobjects.com,
-- example.co.in, *, example.me, exampleobjects.me Use the script argument
-- 'domain-lookup' to find trusted domains available for
-- purchase</elem>
-- </table>
-- <table key="refs">
-- <elem>
-- https://www.adobe.com/devnet/articles/crossdomain_policy_file_spec.html</elem>
-- <elem>
-- https://www.owasp.org/index.php/Test_RIA_cross_domain_policy_%28OTG-CONFIG-008%29</elem>
-- <elem>
-- http://sethsec.blogspot.com/2014/03/exploiting-misconfigured-crossdomainxml.html</elem>
-- <elem>
-- https://www.adobe.com/devnet-docs/acrobatetk/tools/AppSec/CrossDomain_PolicyFile_Specification.pdf</elem>
-- <elem>
-- http://acunetix.com/vulnerabilities/web/insecure-clientaccesspolicy-xml-file</elem>
-- <elem>
-- http://gursevkalra.blogspot.com/2013/08/bypassing-same-origin-policy-with-flash.html</elem>
-- </table>
--
---
author = {"Seth Art <sethsec()gmail>", "Paulino Calderon <calderon()websec.mx>", "Gyanendra Mishra"}
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"safe", "external", "vuln"}
portrule = shortport.http
local tlds_instantdomainsearch = {".com", ".net", ".org", ".co", ".info", ".biz", ".mobi", ".us", ".ca", ".co.uk",
".in", ".io", ".it", ".pt", ".me", ".tv"}
---
-- Queries instantdomainsearch.com to check if domains are available
-- Returns nil if the query failed and true/false to indicate domain availability
--
-- Sample response:
--
-- {"label":"nmap","tld":"com","isRegistered":true,"isBid":false,
-- "price":0,"aftermarketProvider":"","rank":14.028985023498535,"search":"name"}
-- {"words":["nmap"],"synonyms":["nmap","scans"],"tld":"com","isBid":false,"price":0,
-- "aftermarketProvider":"","rank":0.23496590554714203,"search":"word"}
-- {"label":"snmap","tld":"com","isBid":false,"price":2994,"aftermarketProvider":"afternic.com",
-- "rank":9.352656364440918,"search":"ngram"}
---
local function check_domain (domain)
local name, tld = domain:match("(%w*)%.*(%w*%.%w+)$")
if not(tableaux.contains(tlds_instantdomainsearch, tld)) then
stdnse.debug(1, "TLD '%s' is not supported by instantdomainsearch.com. Check manually.", tld)
return nil
end
stdnse.print_debug(1, "Checking availability of domain %s with tld:%s ", name, tld)
local path = string.format("/all/%s?/tlds=%s&limit=1", name, tld)
local response = http.get("instantdomainsearch.com", 443, path, {any_af=true})
if ( not(response) or (response.status and response.status ~= 200) ) then
return nil
end
local _, _, registered = response.body:find('"isRegistered":(.-),"isBid":')
return registered
end
---
-- Requests and parses crossdomain.xml file
---
function check_crossdomain(host, port, lookup)
local trusted_domains = {}
local trusted_domains_available = {}
local content = {}
local req_opt = {redirect_ok=function(host,port)
local c = 3
return function(uri)
if ( c==0 ) then return false end
c = c - 1
return true
end
end}
local domain_table = {}
local CROSSDOMAIN = {
uri = '/crossdomain.xml',
attribute = function(name, value)
if name == 'domain' then
table.insert(domain_table, value)
end
end,
}
local CLIENTACCESS = {
uri = '/clientaccesspolicy.xml',
attribute = function(name, value)
if name == 'uri' then
table.insert(domain_table, value)
end
end,
}
local lists = {}
table.insert(lists, CROSSDOMAIN)
table.insert(lists, CLIENTACCESS)
for _, list in pairs(lists) do
local req = http.get(host, port, list.uri, req_opt)
if req.status and req.status == 200 then
domain_table = {}
local parser = slaxml.parser:new({attribute = list.attribute})
parser:parseSAX (req.body)
table.insert(content, {name = list.uri, body = req.body})
for _, domain in pairs(domain_table) do
--Matches wildcard, which means vulnerable as any host can comunicate with app
if domain == '*' or domain == 'http://' or domain == 'https://' then
stdnse.debug(1, "Wildcard detected!")
table.insert(trusted_domains, domain)
else
--Parse domains
local line = domain:gsub("%*%.", "")
stdnse.debug(1, "Extracted line: %s", line)
local domain = line:match("(%w*%.*%w+%.%w+)$")
if domain ~= nil then
--Deals with tlds with double extension
local tld = domain:match("%w*(%.%w*)%.%w+$")
if tld ~= nil and not(tableaux.contains(tlds_instantdomainsearch, tld)) then
domain = domain:match("%w*%.(.*)$")
end
--We add domains only once as they can appear multiple times
if not(tableaux.contains(trusted_domains, domain)) then
stdnse.debug(1, "Added trusted domain:%s", domain)
table.insert(trusted_domains, domain)
--Lookup domains if script argument is set
if ( lookup ) then
if check_domain(domain) == "false" then
stdnse.debug(1, "Domain '%s' is available for purchase!", domain)
table.insert(trusted_domains_available, domain)
end
end
end
end
stdnse.debug(1, "Extracted domain: %s", domain)
end
end
end
end
if (#trusted_domains> 0) then
return true, trusted_domains, trusted_domains_available, content
else
return nil
end
end
action = function(host, port)
local lookup = stdnse.get_script_args(SCRIPT_NAME..".domain-lookup") or false
local vuln_report = vulns.Report:new(SCRIPT_NAME, host, port)
local vuln = {
title = 'Cross-domain and Client Access policies.',
state = vulns.STATE.NOT_VULN,
description = [[
A cross-domain policy file specifies the permissions that a web client such as Java, Adobe Flash, Adobe Reader,
etc. use to access data across different domains. A client acces policy file is similar to cross-domain policy
but is used for M$ Silverlight applications. Overly permissive configurations enables Cross-site Request
Forgery attacks, and may allow third parties to access sensitive data meant for the user.]],
references = {
'http://sethsec.blogspot.com/2014/03/exploiting-misconfigured-crossdomainxml.html',
'http://gursevkalra.blogspot.com/2013/08/bypassing-same-origin-policy-with-flash.html',
'https://www.adobe.com/devnet/articles/crossdomain_policy_file_spec.html',
'https://www.adobe.com/devnet-docs/acrobatetk/tools/AppSec/CrossDomain_PolicyFile_Specification.pdf',
'https://www.owasp.org/index.php/Test_RIA_cross_domain_policy_%28OTG-CONFIG-008%29',
'http://acunetix.com/vulnerabilities/web/insecure-clientaccesspolicy-xml-file'
},
}
local check, domains, domains_available, content = check_crossdomain(host, port, lookup)
local mt = {__tostring=function(p) return ("%s:\n %s"):format(p.name, p.body:gsub("\n", "\n ")) end}
if check then
if tableaux.contains(domains, "*") or tableaux.contains(domains, "https://") or tableaux.contains(domains, "http://") then
vuln.state = vulns.STATE.VULN
else
vuln.state = vulns.STATE.LIKELY_VULN
end
for i, _ in pairs(content) do
setmetatable(content[i], mt)
tostring(content[i])
end
vuln.check_results = content
vuln.extra_info = string.format("Trusted domains:%s\n", table.concat(domains, ', '))
if not(lookup) and nmap.verbosity()>=2 then
vuln.extra_info = vuln.extra_info .. "Use the script argument 'domain-lookup' to find trusted domains available for purchase"
end
if lookup ~= nil and #domains_available>0 then
vuln.state = vulns.STATE.EXPLOIT
vuln.extra_info = vuln.extra_info .. string.format("[!]Trusted domains available for purchase:%s", table.concat(domains_available, ', '))
end
end
return vuln_report:make_output(vuln)
end