+++ This bug was initially created as a clone of Bug #190863 +++
The check_connection function in sql_parse.cc in MySQL 4.0.x up to 4.0.26, 4.1.x
up to 4.1.18, and 5.0.x up to 5.0.20 allows remote attackers to read portions of
memory via a username without a trailing null byte, which causes a buffer over-read.
This issue also affects FC4
5.0.21 is pushed into FC5, and 4.1.19 into FC4.