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

 
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


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The information within this paper may change without notice. We may
not be held responsible for the use and/or potential effects of these
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not at all. You solely are responsible for this judgment. 

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