Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
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Date: Fri, 6 Sep 2019 13:14:06 +0200
From: Heiko Schlittermann <hs@...marc.schlittermann.de>
To: oss-security <oss-security@...ts.openwall.com>,
	Exim Users <exim-users@...m.org>
Subject: Re: CVE-2019-15846: Exim - local or remote attacker can execute
 programs with root privileges.

An Update to the mitigation for the current CVE:

Add - as part of the mail ACL (the ACL referenced by the main config
option "acl_smtp_mail"):

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

This should prevent the currently known attack vector.

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