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Home » Hacking News » acFTP Authentication Issue

acFTP Authentication Issue

by Nikola Strahija on November 25th, 2002 acFTP is an open-source FTP daemon for Windows platforms ( that offers more functionality than many proprietary servers (including the MS FTP service). The authentication code of acFTP contains a flaw -- specifically, the server treats users as logged in without a valid password. This results in mis-representation of server activity in log files, and possibly privilege elevation.

For example:

USER private

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

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