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Date: Thu, 23 Apr 2020 17:58:06 +0200
From: Claus Assmann <ml+oss@...tp.org>
To: oss-security@...ts.openwall.com
Subject: Re: spoofing of local email sender via a homoglyph attack
On Thu, Apr 23, 2020, PromiseLabs Pentest Research wrote:
> It's related to the from header.
> 220 *** OMITTED *** ESMTP Postfix
> mail from: john.doe@...ver.com
> 250 2.1.0 Ok
1. The correct syntax is
MAIL From:<john.doe@...ver.com>
See RFC 5321 et.al: no spaces, and <> around the address.
2. That's the envelope sender, not "the from header"
You can probably use
From: john.doe@...ver.com
in the header even without authentication (I haven't tried it; I
do not have postfix installed).
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