[NT] acFTP Authentication Issue

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From: support@securiteam.com
To: list@securiteam.com
Date: 24 Nov 2002 08:41:08 +0200

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  acFTP Authentication Issue
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SUMMARY

 <http://sourceforge.net/projects/acftp> acFTP is an OpenSource
replacement for Microsoft FTP server and other proprietary FTP servers for
Windows. Unlike MS FTP, acFTP supports extended FTP commands set,
including APPE and REST for resuming broken uploads and downloads. Due to
a flaw in the authentication code of acFTP, the server treats users as
logged in even without them having a valid password. This results in
mis-representation of server activity in log files, and possibly privilege
elevation.

DETAILS

Vulnerable systems:
  * acFTP version 1.4

For example:
USER private
PASS #

This leads it to reject our password, but we can not log in with another
set of credentials, and our log activity appears as "private" instead of
the appropriate "-" or "***".

ADDITIONAL INFORMATION

The information has been provided by <mailto:mattmurphy@kc.rr.com>
Matthew Murphy.

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