Re: [exim] for europeans only: EU GDPR and mitigation of CV…

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Author: Heiko Schlittermann
To: exim-users
Subject: Re: [exim] for europeans only: EU GDPR and mitigation of CVE-2019-15846
Cyborg via Exim-users <exim-users@???> (Fr 06 Sep 2019 14:37:23 CEST):
> Hi,
> this post is only relevant for European Corps or Organisations WITH
> mailerservers
> in or outside of the EU.  if you are not based in the EU, you can skip this.
> As a possible Mitigation for  CVE-2019-15846 stopping to use TLS in form of
> tls_advertise_hosts =
> in your config, is a bigger deal, as you may think.

For that reason I've published another mitigation method

    # to be prepended to your mail acl (the ACL referenced
    # by the acl_smtp_mail main config option)
    deny    condition = ${if eq{\\}{${substr{-1}{1}{$tls_in_sni}}}}
    deny    condition = ${if eq{\\}{${substr{-1}{1}{$tls_in_peerdn}}}}

    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
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