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 , : > > 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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