Unknown vulnerability in MySQL 3.23.58 and earlier, when a local user has privileges for a database whose name includes a "_" (underscore), grants privileges to other databases that have similar names, which can allow the user to conduct unauthorized activities.
https://www.ubuntu.com/usn/usn-32-1/
https://exchange.xforce.ibmcloud.com/vulnerabilities/17783
http://www.redhat.com/support/errata/RHSA-2004-611.html
http://www.redhat.com/support/errata/RHSA-2004-597.html
http://www.mandriva.com/security/advisories?name=MDKSA-2005:070
http://www.debian.org/security/2005/dsa-707
http://www.ciac.org/ciac/bulletins/p-018.shtml
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000947