vulners
NSE detection rule by gmedian AT vulners DOT com · Same as Nmap--See https://nmap.org/book/man-legal.html
For each available CPE the script prints out known vulns (links to the correspondent info) and correspondent CVSS scores.
Its work is pretty simple:
* work only when some software version is identified for an open port
* take all the known CPEs for that software (from the standard nmap -sV output)
* make a request to a remote server (vulners.com API) to learn whether any known vulns exist for that CPE
* if no info is found this way, try to get it using the software name alone
* print the obtained info out
NB:
Since the size of the DB with all the vulns is more than 250GB there is no way to use a local db.
So we do make requests to a remote service. Still all the requests contain just two fields - the
software name and its version (or CPE), so one can still have the desired privacy.
description = [[
For each available CPE the script prints out known vulns (links to the correspondent info) and correspondent CVSS scores.
Its work is pretty simple:
* work only when some software version is identified for an open port
* take all the known CPEs for that software (from the standard nmap -sV output)
* make a request to a remote server (vulners.com API) to learn whether any known vulns exist for that CPE
* if no info is found this way, try to get it using the software name alone
* print the obtained info out
NB:
Since the size of the DB with all the vulns is more than 250GB there is no way to use a local db.
So we do make requests to a remote service. Still all the requests contain just two fields - the
software name and its version (or CPE), so one can still have the desired privacy.
]]
---
-- @usage
-- nmap -sV --script vulners [--script-args mincvss=<arg_val>] <target>
--
-- @args vulners.mincvss Limit CVEs shown to those with this CVSS score or greater.
--
-- @output
--
-- 53/tcp open domain ISC BIND DNS
-- | vulners:
-- | ISC BIND DNS:
-- | CVE-2012-1667 8.5 https://vulners.com/cve/CVE-2012-1667
-- | CVE-2002-0651 7.5 https://vulners.com/cve/CVE-2002-0651
-- | CVE-2002-0029 7.5 https://vulners.com/cve/CVE-2002-0029
-- | CVE-2015-5986 7.1 https://vulners.com/cve/CVE-2015-5986
-- | CVE-2010-3615 5.0 https://vulners.com/cve/CVE-2010-3615
-- | CVE-2006-0987 5.0 https://vulners.com/cve/CVE-2006-0987
-- |_ CVE-2014-3214 5.0 https://vulners.com/cve/CVE-2014-3214
--
-- @xmloutput
-- <table key="cpe:/a:isc:bind:9.8.2rc1">
-- <table>
-- <elem key="is_exploit">false</elem>
-- <elem key="cvss">8.5</elem>
-- <elem key="id">CVE-2012-1667</elem>
-- <elem key="type">cve</elem>
-- </table>
-- <table>
-- <elem key="is_exploit">false</elem>
-- <elem key="cvss">7.8</elem>
-- <elem key="id">CVE-2015-4620</elem>
-- <elem key="type">cve</elem>
-- </table>
-- </table>
author = 'gmedian AT vulners DOT com'
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"vuln", "safe", "external"}
local http = require "http"
local json = require "json"
local string = require "string"
local table = require "table"
local nmap = require "nmap"
local stdnse = require "stdnse"
local api_version="1.2"
local mincvss=stdnse.get_script_args("vulners.mincvss")
mincvss = tonumber(mincvss) or 0.0
portrule = function(host, port)
local vers=port.version
return vers ~= nil and vers.version ~= nil
end
local cve_meta = {
__tostring = function(me)
return ("\t%s\t%s\thttps://vulners.com/%s/%s%s"):format(me.id, me.cvss or "", me.type, me.id, me.is_exploit and '\t*EXPLOIT*' or '')
end,
}
---
-- Return a string with all the found cve's and correspondent links
--
-- @param vulns a table with the parsed json response from the vulners server
--
function make_links(vulns)
local output = {}
if not vulns or not vulns.data or not vulns.data.search then
return
end
for _, vuln in ipairs(vulns.data.search) do
local v = {
id = vuln._source.id,
type = vuln._source.type,
-- Mark the exploits out
is_exploit = vuln._source.bulletinFamily:lower() == "exploit",
-- Sometimes it might happen, so check the score availability
cvss = tonumber(vuln._source.cvss.score),
}
-- NOTE[gmedian]: exploits seem to have cvss == 0, so print them anyway
if not v.cvss or (v.cvss == 0 and v.is_exploit) or mincvss <= v.cvss then
setmetatable(v, cve_meta)
output[#output+1] = v
end
end
if #output > 0 then
-- Sort the acquired vulns by the CVSS score
table.sort(output, function(a, b)
return a.cvss > b.cvss or (a.cvss == b.cvss and a.id > b.id)
end)
return output
end
end
---
-- Issues the requests, receives json and parses it, calls <code>make_links</code> when successfull
--
-- @param what string, future value for the software query argument
-- @param vers string, the version query argument
-- @param type string, the type query argument
--
function get_results(what, vers, type)
local api_endpoint = "https://vulners.com/api/v3/burp/software/"
local vulns
local option={
header={
['User-Agent'] = string.format('Vulners NMAP Plugin %s', api_version)
},
any_af = true,
}
local response = http.get_url(('%s?software=%s&version=%s&type=%s'):format(api_endpoint, what, vers, type), option)
local status = response.status
if status == nil then
-- Something went really wrong out there
-- According to the NSE way we will die silently rather than spam user with error messages
return
elseif status ~= 200 then
-- Again just die silently
return
end
status, vulns = json.parse(response.body)
if status == true then
if vulns.result == "OK" then
return make_links(vulns)
end
end
end
---
-- Calls <code>get_results</code> for type="software"
--
-- It is called from <code>action</code> when nothing is found for the available cpe's
--
-- @param software string, the software name
-- @param version string, the software version
--
function get_vulns_by_software(software, version)
return get_results(software, version, "software")
end
---
-- Calls <code>get_results</code> for type="cpe"
--
-- Takes the version number from the given <code>cpe</code> and tries to get the result.
-- If none found, changes the given <code>cpe</code> a bit in order to possibly separate version number from the patch version
-- And makes another attempt.
-- Having failed returns an empty string.
--
-- @param cpe string, the given cpe
--
function get_vulns_by_cpe(cpe)
local vers_regexp=":([%d%.%-%_]+)([^:]*)$"
-- TODO[gmedian]: add check for cpe:/a as we might be interested in software rather than in OS (cpe:/o) and hardware (cpe:/h)
-- TODO[gmedian]: work not with the LAST part but simply with the THIRD one (according to cpe doc it must be version)
-- NOTE[gmedian]: take only the numeric part of the version
local _, _, vers = cpe:find(vers_regexp)
if not vers then
return
end
local output = get_results(cpe, vers, "cpe")
if not output then
local new_cpe
new_cpe = cpe:gsub(vers_regexp, ":%1:%2")
output = get_results(new_cpe, vers, "cpe")
end
return output
end
action = function(host, port)
local tab=stdnse.output_table()
local changed=false
local response
local output
for i, cpe in ipairs(port.version.cpe) do
output = get_vulns_by_cpe(cpe, port.version)
if output then
tab[cpe] = output
changed = true
end
end
-- NOTE[gmedian]: issue request for type=software, but only when nothing is found so far
if not changed then
local vendor_version = port.version.product .. " " .. port.version.version
output = get_vulns_by_software(port.version.product, port.version.version)
if output then
tab[vendor_version] = output
changed = true
end
end
if (not changed) then
return
end
return tab
end