sql/sql_table.cc in MySQL 5.0.x through 5.0.88, 5.1.x through 5.1.41, and 6.0 before 6.0.9-alpha, when the data home directory contains a symlink to a different filesystem, allows remote authenticated users to bypass intended access restrictions by calling CREATE TABLE with a (1) DATA DIRECTORY or (2) INDEX DIRECTORY argument referring to a subdirectory that requires following this symlink.
https://bugzilla.redhat.com/show_bug.cgi?id=543619
http://www.vupen.com/english/advisories/2010/1107
http://www.ubuntu.com/usn/USN-1397-1
http://www.securityfocus.com/bid/38043
http://www.mandriva.com/security/advisories?name=MDVSA-2010:044
http://ubuntu.com/usn/usn-897-1
http://support.apple.com/kb/HT4077
http://secunia.com/advisories/38517
http://marc.info/?l=oss-security&m=125908040022018&w=2
http://lists.opensuse.org/opensuse-security-announce/2010-11/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2010-05/msg00001.html
http://lists.apple.com/archives/security-announce/2010//Mar/msg00001.html