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Date: Fri, 12 Jan 2018 15:10:23 +0100
From: Daniël van Eeden <>
Subject: DBD::mysql and SSL/TLS


I have some serious concerns about the state of SSL/TLS in DBD::mysql.

Issue 1: CVE-2017-10789 isn't fixed

Issue 2: Using DBD::mysql with MariaDB 10.0 or higher or MySQL 8.0 or
higher provides a false sense of security

SSL_LAST_VERIFY_VERSION is set to 50799.
Any version higher than that silently ignores mysql_ssl_verify_server_cert

This can lead to unencrypted connections even with strict SSL settings.

Issue 3: If SSL support is unavailable but ssl options are set then these
options are silently ignored.

issue 4: If compiled against MySQL 5.7 then SSL/TLS is used when available,
but can't be disabled. (mysql_ssl=0 is ignored).

This makes upgrading to 5.7 more difficult. And 5.7 is needed to get
support for TLSv1.1 and TLSv1.2.

There is a patch available for this:

Daniël van Eeden
Database Administrator B.V.
Vijzelstraat 66-80 Amsterdam 1017HL Netherlands
Direct +31207033812
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