ietf-asrg
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Re: [Asrg] Replay attack

2009-01-13 20:46:58
Franck Martin wrote:
Hi all,

I received an error report that an email could not be delivered to
abuse(_at_)genocide(_dot_)ru(_dot_) The email that was tried to be sent is 
below.

What is interesting, the email seems to be geniune enough, with a DKIM
and DomainKey signature.

1) Do anyone knows where on the web I could paste this email and verify
the DKIM ? A kind of web form.

It won't verify, because it's signing the To, I have a copy with a
different To, with the same signature.

There's at least one BOT going around inserting fixed DKIM signatures.

Return-path: <abuse(_at_)genius(_dot_)com>
Received: from broadband-77-37-184-167.nationalcablenetworks.ru 
([77.37.184.167] helo=list.mediresource.com)
      by direct.va.ru with smtp (Exim 4.53)
      id 1LMsMZ-0003zp-62
      for abuse(_at_)genocide(_dot_)ru; Wed, 14 Jan 2009 02:07:59 +0300

It came from the above IP.  The rest is fakery.  I have quite a number
of these with radically different peer addresses.

Eg:

Received: from dsl15-117.express.oricom.ca (HELO list.mediresource.com)
(64.18.184.117)
    by ertps004.nortel.com (qpsmtpd/0.43rc1) with SMTP; Tue, 13 Jan 2009
20:41:0
1 -0500

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