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.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9918
https://exchange.xforce.ibmcloud.com/vulnerabilities/26236
http://www.wisec.it/vulns.php?page=7
http://www.vupen.com/english/advisories/2008/1326/references
http://www.vupen.com/english/advisories/2007/0930
http://www.vupen.com/english/advisories/2006/1633
http://www.us-cert.gov/cas/techalerts/TA07-072A.html
http://www.trustix.org/errata/2006/0028
http://www.securityfocus.com/bid/17780
http://www.securityfocus.com/archive/1/434164/100/0/threaded
http://www.securityfocus.com/archive/1/432733/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2006-0544.html
http://www.novell.com/linux/security/advisories/2006-06-02.html
http://www.mandriva.com/security/advisories?name=MDKSA-2006:084
http://www.gentoo.org/security/en/glsa/glsa-200605-13.xml
http://www.debian.org/security/2006/dsa-1079
http://www.debian.org/security/2006/dsa-1073
http://www.debian.org/security/2006/dsa-1071
http://sunsolve.sun.com/search/document.do?assetkey=1-26-236703-1
http://slackware.com/security/viewer.php?l=slackware-security&y=2006&m=slackware-security.599377
http://securitytracker.com/id?1016017
http://securityreason.com/securityalert/840
http://secunia.com/advisories/29847
http://secunia.com/advisories/24479
http://secunia.com/advisories/20762
http://secunia.com/advisories/20625
http://secunia.com/advisories/20457
http://secunia.com/advisories/20424
http://secunia.com/advisories/20333
http://secunia.com/advisories/20253
http://secunia.com/advisories/20241
http://secunia.com/advisories/20223
http://secunia.com/advisories/20076
http://secunia.com/advisories/20073
http://secunia.com/advisories/20002
http://secunia.com/advisories/19929
http://lists.suse.com/archive/suse-security-announce/2006-Jun/0011.html
http://lists.apple.com/archives/security-announce/2007/Mar/msg00002.html
http://docs.info.apple.com/article.html?artnum=305214