Fastream NETFile Server Lets Remote Users Deny Service With Non-Existent Usernames
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SecurityTracker Alert ID: 1009868 |
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SecurityTracker URL: http://securitytracker.com/id/1009868
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Updated: Apr 19 2004
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Original Entry Date: Apr 19 2004
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Impact:
Denial of service via network
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Fix Available: Yes Vendor Confirmed: Yes Exploit Included: Yes
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Version(s): 6.5.1.980
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Description:
Donato Ferrante reported a vulnerability in the Fastream NETFile Server. A remote user can cause denial of service conditions on the target system.
The report indicates that a remote user can send USER and PASS information for a non-existent username to cause the FTP service to become unavailable.
The original advisory is available at:
http://www.autistici.org/fdonato/advisory/FastreamNETFileFWServer6.5.1.980-adv.txt
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Impact:
A remote user can cause denial of service conditions on the FTP service.
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Solution:
The vendor has released a fixed version (6.5.1.981), available at:
http://www.fastream.com/download.htm
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Vendor URL: www.fastream.com/netfileserver.htm (Links to External Site)
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Cause:
Exception handling error
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Underlying OS:
Windows (Any)
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Message History:
None.
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Source Message Contents
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Date: Mon, 19 Apr 2004 09:26:30 -0400
Subject: http://www.autistici.org/fdonato/advisory/FastreamNETFileFWServer6.5.1.980-adv.txt
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Donato Ferrante
Application: Fastream NETFile FTP/Web Server
http://www.fastream.com/
Version: 6.5.1.980
Bug: Denial Of Service
Date: 19-Apr-2004
Author: Donato Ferrante
e-mail: fdonato@autistici.org
web: www.autistici.org/fdonato
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1. Description
2. The bug
3. The code
4. The fix
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1. Description:
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Vendor's description:
"Secure, multi-threaded FTP/HTTP server combined, featuring automatic
virtual links, U/D ratios, quotas, authentication and extremely fast
directory and file caches. Other features include: User and group
permissions with permissions for all standard FTP and HTTP commands.
Serving from behind NAT/PAT. HTTP file uploading and management.
Free for personal use; professional license is required for commercial
usage."
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2. The bug:
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The program is unable to manage nonexistent usernames in the login
procedure. So attacker can deny the ftp service by sending crafted
USER and PASS strings.
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3. The code:
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To test the vulnerability:
1-a. connect to the ftp server and when it asks
for the USER, type: anUsername
for the PASS, type: aPassword
1-b. send to the ftp server something like:
USER anUsername
PASS aPassword
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4. The fix:
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Bug fixed in the version 6.5.1.981.
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