Buffer overflow in pam_smb and pam_ntdom pluggable authentication modules (PAM) allow remote attackers to execute arbitrary commands via a login with a long user name.
http://www.securityfocus.com/bid/1666
http://www.novell.com/linux/security/advisories/adv8_draht_pam_smb_txt.html
http://www.linux-mandrake.com/en/security/MDKSA-2000-047.php3
http://www.debian.org/security/2000/20000911
http://archives.neohapsis.com/archives/bugtraq/2000-09/0114.html
http://archives.neohapsis.com/archives/bugtraq/2000-09/0073.html