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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
--
SCHLITTERMANN.de ---------------------------- internet & unix support -
Heiko Schlittermann, Dipl.-Ing. (TU) - {fon,fax}: +49.351.802998{1,3} -
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