From: Secunia Security Advisories (sec-advsecunia.com)
Date: Fri Oct 15 2004 - 06:52:07 CDT

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TITLE:
ProFTPD User Enumeration Weakness

SECUNIA ADVISORY ID:
SA12836

VERIFY ADVISORY:
http://secunia.com/advisories/12836/

CRITICAL:
Not critical

IMPACT:
Exposure of system information

WHERE:
From remote

SOFTWARE:
ProFTPD 1.2.x
http://secunia.com/product/1250/

DESCRIPTION:
LSS Security Team has reported a weakness in ProFTPD, which
potentially can be exploited by malicious people to determine valid
usernames.

The problem is that there is a time delay difference in the login
process for existing and non-existing usernames. This can be
exploited to determine valid user accounts and potentially their
privileges by sending some "USER" commands and calculating the
response period.

The weakness has been reported in version 1.2.x. Other versions may
also be affected.

SOLUTION:
Restrict access to the FTP server.

PROVIDED AND/OR DISCOVERED BY:
LSS Security Team

ORIGINAL ADVISORY:
http://security.lss.hr/en/index.php?page=details&ID=LSS-2004-10-02

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