full-disclosure - Proposal: how to notify owners of compromisedPC's

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Message-ID: <20040128202651.0EC652B4D9C@mail.evilcoder.org>
From: remko at elvandar.org (Remko Lodder)
Subject: Proposal: how to notify owners of compromisedPC's

indeed i also object to these issues, i dont want to be dependant on my ISP
when
it comes to sending email from my domains, i want to send and block whoever
i want
to block, and i want the ability host these stuff myself on my home ADSL
line.

currently my users can only use webmail, so no relaying can be done from my
machines.

Other options must be thought off ;)

cheers

--

Kind regards,

Remko Lodder
Elvandar.org/DSINet.org
www.mostly-harmless.nl Dutch community for helping newcomers on the
hackerscene

-----Oorspronkelijk bericht-----
Van: full-disclosure-bounces@...ts.elvandar.org
[mailto:full-disclosure-bounces@...ts.elvandar.org]Namens petard
Verzonden: woensdag 28 januari 2004 19:37
Aan: Thomas Zangl - Mobil
CC: full-disclosure@...sys.com
Onderwerp: Re: [Full-Disclosure] Proposal: how to notify owners of
compromisedPC's

On Wed, Jan 28, 2004 at 05:19:08PM +0100, Thomas Zangl - Mobil wrote:
> A working solution (practiced at the TU Graz / Austria) would be an open
> mail relay for every user in the ISPs address space and block all outgoing
> connections to port 25. The users will be forced to use the ISPs relay and
> can?t send out virii/[apply your favorite filter rule here] etc...

Sorry for a borderline off-topic reply, but I'm cc-ing the list so this
is in the archives, in case any stupid ISP reads this and thinks it's a
good idea. It isn't.

I left my ISP about 9 months ago because they implemented this very
policy. It entirely destroyed my ability to send email from my preferred
address. Our SMTP setup at example.com relays mail from people
claiming to be @example.com if and only if they have been authenticated
using a client X.509 certificate issued by the example.com root
certificate authority. The mechanism for achieving this is to connect to
smtp.example.com, port 25, and use the STARTTLS command after the EHLO,
as described in RFC 3207. The policy you describe broke this, and
therefore prevented me from sending mail to my cohorts at example.com.
The ISP would not make an exception, so I left. I was not the only one.

regards,

petard

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