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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

http://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

range of security services:



* Network Penetration Testing

* Security Application development

* Application Security Testing and Certification

* Security Based on Security Tools

* Cryptography

* Emergency Response Team

* Firewalling

* Virtual Private Networking

* Intrusion Detection

* Support and maintenance



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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