Re: [exim] CVE-2019-15846: Exim - local or remote attacker c…

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Author: Heiko Schlittermann
Date:  
To: oss-security, Exim Users
Subject: Re: [exim] 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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