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TUCoPS :: Windows Net Apps :: telnetd8.htm

InterAccess TelnetD Server 4.0 Buffer Overflow



Vulnerability

    TelnetD Server

Affected

    InterAccess TelnetD Server 4.0 for Windows NT

Description

    UssrLabs  found  a  local/remote  buffer  overflow.  The code that
    handles the login commands in the telnet session has an  unchecked
    buffer that  will allow  arbitrary code  to be  executed if  it is
    overflowed.  Example:

        [hellme@die-communitech.net$ telnet example.com
        Trying example.com...
        Connected to example.com.
        Escape character is '^]'.

        InterAccess TelnetD Server (30 Day Trial Version)
        Release 4.0
        Copyright (C) 1994-1999 by Pragma Systems, Inc.
        All rights reserved.

        This copy will expire on Tue Mar 21 21:55:14 2000

        login name:  (buffer)

    Where [buffer]  is aprox.  300 characters.   The exploit  lags the
    machine until 100% cpu time.  Mimed source od exploit:

    ---
    Content-Type: application/octet-stream; name="ex_telnd.zip"
    Content-Transfer-Encoding: base64
    Content-Disposition: inline; filename="ex_telnd.zip"
    Content-MD5: NSoI176O/cy9MnzPY/2igQ==
    
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    -----

Solution

    This was a  BUILD 4 issue  (which was released  June 1998) and  we
    are now  on BUILD  7.   The problem  can be  fixed by updating the
    service pack/WinSock or by updating to BUILD 7.


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