TransSoft's Broker FTP Server 3.x & 4.x Remote DoS attack Vulnerability

[Luciano Martins <luck () USSRBACK COM>]

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TransSoft's Broker FTP Server 3.x & 4.x Remote DoS attack
Vulnerability

USSR Advisory Code:  USSR-2000054

Public Disclosure Date:
October 18, 2000

Vendors Affected:

TransSoft's:
http://www.transsoft.com/

Systems Affected:
Broker FTP Server, all releases prior to 4.3.0.1 are affected

Problem:
The USSR Team has found a buffer overflow in the Broker FTP Server,
which
can enable an attacker to execute a denial of service attack against
it.  If the FTP server is running as a service, an attacker can cause
the
server to consume _all_ memory and computer resources by inputing a
username that is 6000 characters or greater.

Note:

We take no responsibility for this code.  It is for educational
purposes only.

Example:

[pic@peludita]$ telnet example.com 21
Trying example.com...
Connected to example.com.
Escape character is '^]'.
220 FTP Server ready [***]
[buffer]


Where [buffer] is aprox. 6000 characters.


Date of Vendor Notification:
29-9-2000

Status:

Fixed, in versions up to, 4.3.0.1

Fix:
http://www.transsoft.com/broker/updates/broker40nt.exe
ftp://ftp-broker.com/pub/broker40nt.exe

Related Links:

Underground Security Systems Research:
http://www.ussrback.com

CrunchSp Product:
http://www.crunchsp.com


About:

USSR is an emerging security company based in South America devoted
to research about network security, vulnerability research, and
software
protection systems. One of the main objectives of USSR is to develop
and
implement new security and protection systems based on our knowledge
and
experience.

However, we believe that the way we implement security solutions,
can make a difference, CrunchSP is a good example.
In our day-to-day research we detect vulnerability issues in
different applications that we publish on our advisory board.

Most of USSR programmers and partners have more than 12 years
of experience in different computer based applications, with
great knowledge in high and low level programming languages.

For further information on USSR, feel free to contact us by email.

USSR has assembled some of the world's greatest software developers
and security consultants to help us provide our customers this great
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Copyright (c) 1999-2000 Underground Security Systems Research.
Permission is hereby granted for the redistribution of this alert
electronically. It is not to be edited in any way without explicit
consent of USSR. If you wish to reprint whole or any part of this
alert in any other medium excluding electronic medium, please e-mail
labs () ussrback com for permission.

Disclaimer:
The information within this paper may change without notice. We may
not be held responsible for the use and/or potential effects of these
programs or advisories.  Use them and read them at your own risk or
not at all. You solely are responsible for this judgment.

Feedback:

If you have any questions, comments, concerns, updates, or
suggestions
please feel free to send them to:

Underground Security Systems Research
mail:labs () ussrback com
http://www.ussrback.com

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