MySQL before 3.23.31 allows users with a MySQL account to use the SHOW GRANTS command to obtain the encrypted administrator password from the mysql.user table and possibly gain privileges via password cracking.
http://www.redhat.com/support/errata/RHSA-2001-003.html
http://www.linux-mandrake.com/en/security/2001/MDKSA-2001-014.php3
http://www.calderasystems.com/support/security/advisories/CSSA-2001-006.0.txt