ArGoSoft FTP before 1.4.2.1 generates an error message if the user name does not exist instead of prompting for a password, which allows remote attackers to determine valid usernames.

References

• https://nvd.nist.gov/vuln/detail/CVE-2004-1428
• https://exchange.xforce.ibmcloud.com/vulnerabilities/18721
• http://marc.info/?l=bugtraq&m=110451582011666&w=2
• http://secunia.com/advisories/13063
• http://securitytracker.com/id?1012744
• http://www.argosoft.com/ftpserver/changelist.aspx
• http://www.lovebug.org/argosoft_advisory.txt
• http://www.osvdb.org/11335
• http://www.securityfocus.com/bid/12139