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Date: Fri, 6 Sep 2019 12:44:30 +0200
From: Heiko Schlittermann <>
To: oss-security <>,
	Exim Users <>,
	Exim Announce <>
Subject: Re: CVE-2019-15846: Exim - local or remote attacker can execute
 programs with root privileges.

Heiko Schlittermann <> (Fr 06 Sep 2019 12:20:39 CEST):
> Mitigation
> ==========
> Do not offer TLS for incomming connections (tls_advertise_hosts).
> This mitigation is *not* recommended!

This should block the most popular attack vector:

In your MAIL ACL:

    deny    condition = ${if eq{\\}{${substr{-1}{1}{$tls_in_sni}}}}
            message = sorry

    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
-- ---------------------------- internet & unix support -
 Heiko Schlittermann, Dipl.-Ing. (TU) - {fon,fax}: +49.351.802998{1,3} -
 gnupg encrypted messages are welcome --------------- key ID: F69376CE -
 ! key id 7CBF764A and 972EAC9F are revoked since 2015-01 ------------ -

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