[NT] GoodTech Telnet Server DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 01/05/04

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Date: 5 Jan 2004 11:19:25 +0200

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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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