Security Basics
Re: http-open-proxy.nse question Oct 01 2013 05:13PM
ToddAndMargo (ToddAndMargo zoho com)
On 10/01/2013 05:22 AM, Leon Jacobs wrote:
>
>
>
> On Mon, Sep 30, 2013 at 8:42 PM, ToddAndMargo <ToddAndMargo (at) zoho (dot) com [email concealed]
> <mailto:ToddAndMargo (at) zoho (dot) com [email concealed]>> wrote:
>
> Hi All,
>
> I just read an article over at SANS,
>
> https://isc.sans.edu/forums/__diary/Do+you+have+your+__network+perimeter
+secured+__against+downloading+malicious+__content+/16676
> <https://isc.sans.edu/forums/diary/Do+you+have+your+network+perimeter+se
cured+against+downloading+malicious+content+/16676>
>
> It uses the
> nmap --script http-open-proxy.nse 192.168.0.0/24 <http://192.168.0.0/24>
> script to check for free proxies.
>
> Looking at the result of the scan, I am having a bit
> of trouble figuring out how its shows free proxies.
> I just see a bunch of open ports. What am I missing?
>
> Many thanks,
> -T
>
>
> Hi T,
>
> The script checks potential proxy ports if a HEAD request to
> www.google.com <http://www.google.com> returns a valid status code of
> 200, 301 or 302. In this case, port 8080 allows such a request to
> complete. I'll suggest you read the sources of the .nse for complete
> specifics on what it does :)
>
> --
> Regards
> L.
>

On 10/01/2013 07:54 AM, Mikhail A. Utin wrote:> Hi,
> The idea of this Nmap scanning is that a client computer is not likely having open ports like 80, 8080, or 443, which are server ports associated with http and https respectfully. When DeleGte installs, it opens such ports to communicate with your internal software, actually forwarding your originated internet requests to new ports (i.e. new internal proxy) instead of "official" proxies, which then will communicate with free proxies on Internet.
>
>
> Mikhail Utin, CISSP
> Information Security Analyst
>

Hi Leon, Oleg, Nikhail,

Now I get it. Thank you for the light bulb moment. He should
only have the follow showing, "at the most":

PORT STATE SERVICE REASON
137/tcp closed netbios-ns reset
138/tcp closed netbios-dgm reset
139/tcp open netbios-ssn syn-ack
445/tcp closed microsoft-ds reset

-T

--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Computers are like air conditioners.
They malfunction when you open windows
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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