Xlight FTP Server '..\' Directory Traversal Flaw Discloses Files to Remote Users
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SecurityTracker Alert ID: 1008466
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Dec 15 2003
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Impact: Denial of service via network, Disclosure of system information, Disclosure of user information
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Fix Available: Yes
Exploit Included: Yes
Vendor Confirmed: Yes
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Advisory: Global Security Solution IT (GSSIT)
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Version(s): 1.40
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Description: Ziv Kamir of Global Security Solution IT reported a vulnerability in the Xlight FTP server. A remote authenticated user can view arbitrary files on the system and can cause the FTP service to crash.
It is reported that a remote authenticated user can issue the following type of commands to view arbitrary files that are located
outside of the FTP root directory:
get ..\[Existing File]
recev ..\[Existing File]
It is also reported that a remote authenticated
user can issue the following command to cause the FTP service to crash:
cd ~
The vendor was reportedly notified on December
10, 2003 and responded and fixed the flaw on the same day.
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Impact: A remote authenticated user can view arbitrary files on the target server.
A remote authenticated user can cause the target FTP service to crash.
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Solution: The vendor has released a fixed version (1.41), available at:
http://www.xlightftpd.com/download.htm
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Vendor URL: www.xlightftpd.com/ (Links to External Site)
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Cause: Exception handling error, Input validation error
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Underlying OS: Windows (Any)
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Reported By: GSS IT <gss_it@yahoo.com>
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Message History:
None.
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Source Message Contents
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Date: Sun, 14 Dec 2003 07:00:34 -0800 (PST)
From: GSS IT <gss_it@yahoo.com>
Subject: Vulnerability Under Xlight FTP Server
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This is a multi-part message in MIME format.
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Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
Hi ,
------------------------------------------------------------------------
Do you Yahoo!?
New Yahoo! Photos - easier uploading and sharing
<http://pa.yahoo.com/*http://us.rd.yahoo.com/evt=21260/*http://photos.yahoo.com>
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Content-Type: text/plain;
name="Xlight.txt"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
filename="Xlight.txt"
14/12/03
====================================
GSSIT - Global Security Solution IT
====================================
-------------------------------------------------------
Application: Xlight ftp server
Web Site: http://www.xlightftpd.com/
Versions: 1.40
Platform: Windows
Bugs :
1) Directory Traversal
2) D.O.S
Credits:
########
#########################################
# == Ziv Kamir == #
# #
# GSSIT - Global Security Solution IT #
# #
# Email : gss_it@yahoo.com #
# #
# #
#########################################
---------------------
1) Introduction
2) Bug
3) The Code
4) Fix
================
1) Introduction
================
Xlight ftp server is a powerful ftp server with very small program size. Using its own unique algorit
hm, it could handle more users
than other windows ftp servers. Besides its high performance, xlight ftp server also has a lot of un
ique features.
=======
2) Bugs
=======
1) Directory Traversal
2) D.O.S
===========
3) The Code
===========
1) Any authenticated user can read arbitrary files outside the FTP root Directory
get ..\[Exist File]
recev ..\[Exist File]
2) Any authenticated user can Crash the Server
cd ~
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4) Fix
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Date of Vendor Notification:
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Wed, 10 Dec 2003
Response:
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Wed, 10 Dec 2003 16:23:05
Thank you for the information. Vulnerability places under the prog have been found , the fix will com
e out very soon.
Best Regards,
Xlight ftp support
Fix :
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Wed, 10 Dec 2003 17:34:49
Hi GSS IT,
The fixs for Vulnerabilites are already applied. The version is updated in website.
Thanks very much for the alert.
Best Regards,
xlight ftp server support
support@xlightftpd.com
==============================================================================================
*** The Data is for educational purpose only. ***
The information in this bulletin is provided "AS IS" without
warranty of any kind. In no event shall we be liable for any
damages whatsoever including direct, indirect, incidental,
consequential, loss of business profits or special damages.
==============================================================================================
--------------050301000305050506060708--
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