Am 25. May, 2020 schwätzte Snyder, Alexander J via PLUG-discuss so:

moin moin Alexander,

> The only outbound ports open without concern are 123(UDP), 53(UDP),
> 80(TCP), and 443(TCP). All other ports are blocked, outbound to the web, on
> my system.
>
> If I read this, this would go around my guards, as they are "piggybacking"
> on 443 in and out, right?

Yeah, they'd certainly be sending whatever information they find as a
ruquest to the server on port 443. It looks like normal web traffic
because it is normal web traffic.

There's also html5 gathering info.

https://en.wikipedia.org/wiki/Canvas_fingerprinting

Here's a fun one. At least this one's Open Source ...

https://en.wikipedia.org/wiki/Evercookie

ciao,

der.hans

> Thanks,
> Alexander
>
> Sent from my Galaxy S10+
>
> On Mon, May 25, 2020, 17:12 Harold Hartley via PLUG-discuss <
> plug-discuss@lists.phxlinux.org> wrote:
>
>> I'm not sure if anything can be done to stop port scanning of ports.
>>
>> I'm really not having a big concern since I have 2 firewalls anyway. I
>> have a firewall on one device and a firewall on my computer. So the only
>> ports they will see is the one on my first device and not the computer.
>> At least that's my theory.
>>
>> On 5/25/20 1:17 AM, Steve Litt via PLUG-discuss wrote:
>>> On Sun, 24 May 2020 20:52:43 -0700
>>> Harold Hartley via PLUG-discuss <plug-discuss@lists.phxlinux.org> wrote:
>>>
>>>> But I close up ports that doesn't need to be
>>>> open in order to make my system safe. You'd be surprised at how many
>>>> ports are open that can leave a system open for attacks.
>>> When you say "close up ports", do you mean make sure there's no
>>> executable listening at that port, firewalling that port so nothing can
>>> come in or out, or something else?
>>>
>>> SteveT
>>>
>>> Steve Litt
>>> May 2020 featured book: Troubleshooting Techniques
>>>       of the Successful Technologist
>>> http://www.troubleshooters.com/techniques
>>> ---------------------------------------------------
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>>
>> --
>> Harold Hartley
>> 17632 N. 5th Pl
>> Phoenix, Arizona 85022
>>
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>

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