Unspecified vulnerability in the SQL logging facility in PAM-MySQL 0.6.x before 0.6.2 and 0.7.x before 0.7pre3 allows remote attackers to cause a denial of service (segmentation fault) via unspecified vectors, probably involving the pam_mysql_sql_log function when being used in vsftpd, which does not include the IP address argument to an sprintf call.
http://www.vupen.com/english/advisories/2006/0490
http://www.securityfocus.com/bid/16564
http://www.gentoo.org/security/en/glsa/glsa-200606-18.xml
http://sourceforge.net/tracker/index.php?func=detail&aid=1256243&group_id=5741&atid=305741
http://sourceforge.net/forum/forum.php?forum_id=499394