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