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90a2819a04
remote administration/backdoor program.
- netbus-info: gets configuration information.
- netbus-brute: guesses passwords.
- netbus-version: distinguishes NetBus from NetBuster, a program
that mimics the protocol but doesn't actually allow any
operations.
- netbus-auth-bypass: Checks for a bug in the server that allows
connecting without a password.
56 lines
1.5 KiB
Lua
56 lines
1.5 KiB
Lua
description = [[
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Checks if a NetBus server is vulnerable to authentication bypass.
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Servers with this vulnerability can be accessed without knowing
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the password.
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For example a server running on TCP port 12345 on localhost with
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this vulnerability is accessible to anyone. An attacker could
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simply form a connection to the server ( ncat -C 127.0.0.1 12345 )
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and login to the service by typing Password;1; into the console.
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]]
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---
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-- @output
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-- 12345/tcp open netbus
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-- |_netbus-auth-bypass: Vulnerable
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author = "Toni Ruottu"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = {"default", "vuln", "safe"}
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require("nmap")
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require("stdnse")
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require("shortport")
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dependencies = {"netbus-version", "netbus-brute", "netbus-info"}
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portrule = shortport.port_or_service (12345, "netbus", {"tcp"})
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action = function( host, port )
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local socket = nmap.new_socket()
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local status, err = socket:connect(host.ip, port.number)
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if not status then
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return
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end
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local buffer, _ = stdnse.make_buffer(socket, "\r")
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buffer() --discard banner
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-- The first argument of Password is the super-login bit.
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-- On vulnerable servers any password will do as long as
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-- we send the super-login bit. Regular NetBus has only
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-- one password. Thus, if we can login with two different
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-- passwords using super-login, the server is vulnerable.
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socket:send("Password;1;\r") --password: empty
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if buffer() ~= "Access;1" then
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return
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end
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socket:send("Password;1; \r") --password: space
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if buffer() == "Access;1" then
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return "Vulnerable"
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end
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return
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end
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