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Message-ID: <20200204122711.GA16946@openwall.com>
Date: Tue, 4 Feb 2020 13:27:11 +0100
From: Solar Designer <solar@...nwall.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE-2020-7221: mariadb: possible local mysql to root user exploit in mysql_install_db script setting permissions of /usr/lib64/mysql/plugin/auth_pam_tool_dir/auth_pam_tool
On Tue, Feb 04, 2020 at 11:26:04AM +0100, Matthias Gerstner wrote:
> For Deb/RPM packaging MariaDB continues to suggest to use the following
> dir and file modes [2], [3]:
>
> mysql:root 0700 /usr/lib/mysql/plugin/auth_pam_tool_dir
> root:root 04755 /usr/lib/mysql/plugin/auth_pam_tool_dir/auth_pam_tool
>
> I personally suggest the following directory mode instead:
>
> root:mysql 0750 /usr/lib/mysql/plugin/auth_pam_tool_dir
Why not simply
root:mysql 04710 /usr/lib/mysql/plugin/auth_pam_tool
without the directory? I see only one reason: it's a bigger change
relative to the current implementation, which is more work now, but
perhaps this cleanup is worth it longer-term.
The approach with a directory (or several) is sometimes useful to limit
access to a file yet avoid use of ACLs, but the case above looks simple
enough not to require this complication.
Alexander
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