Re: Telnetd AYT overflow scanner

From: aleph1@securityfocus.com
Date: 07/26/01


Date: Thu, 26 Jul 2001 15:21:23 -0600
From: aleph1@securityfocus.com
To: bugtraq@securityfocus.com
Subject: Re: Telnetd AYT overflow scanner
Message-ID: <20010726152123.Y18916@securityfocus.com>

Summary of responses on this thread:

From: Homer Wilson Smith <homer@lightlink.com>

  Inconsistent results on Linux 2.0.38 running older libc.

  Script started on Wed Jul 25 16:10:02 2001
  superoot emerald/root: ayt romance

  Telnetd AYT overflow scanner, by Security Point(R)
  Host: romance
  Connected to remote host...
  Sending telnet options... stand by...
  Telnetd on romance vulnerable

  superoot emerald/root: ayt romance

  Telnetd AYT overflow scanner, by Security Point(R)
  Host: romance
  Connected to remote host...
  Sending telnet options... stand by...
  Telnetd on romance not vulnerable

From: Rick Crelia <rcrelia@cobaltgroup.com>

  I can corroraborate your findings. The SPtelnetAYT scanner is producing
  "hits" on Linux boxes (2.0.x, 2.2.x, variety of Netkits) whereas the
  scut scanner said they were not vulnerable. This was also the case for
  Solaris 7 and Solaris 8 boxes with the latest Sun patch clusters.

  As of today, it looks like OpenBSD 2.9 and the latest Netkit for Linux
  are known to be not vulnerable.

From: "Chirk C. Chu" <c3chu@alaska.edu>
                                                 
  Based on the results from the Telnet AYT scanner provided by
  info@secpoint.com SRP telnetd is vulnerable. Versions tested:
  1.7.1, 1.7.2 and 1.7.3.

  Red Hat 7.1 - SRP 1.7.3

    $ ./ttest kingpinz
    Telnetd AYT overflow scanner, by Security Point(R)
    Host: kingpinz
    Connected to remote host...
    Sending telnet options... stand by...
    Telnetd on kingpinz vulnerable

  Solaris 8 - SRP 1.7.2

    $ ./ttest snoopy
    Telnetd AYT overflow scanner, by Security Point(R)
    Host: snoopy
    Connected to remote host...
    Sending telnet options... stand by...
    Telnetd on snoopy vulnerable

  Tru64 4.0G - SRP 1.7.1

    $ ./ttest chaos
    Telnetd AYT overflow scanner, by Security Point(R)
    Host: chaos
    Connected to remote host...
    Sending telnet options... stand by...
    Telnetd on chaos vulnerable

From: Serguei Patchkovskii <patchkov@ucalgary.ca>

  Unfortunately, this scanner generates false negatives. It reports
  Tru64 4.0d pl8 as not vulnerable. However, it causes telnetd on
  this system to dump core - which would presumably indicate that
  it -is- vulnerable.

From: GVB <gvb@abused.com>

  Juniper Routers (running something based on one of the BSD's) are also
  vulnerable to this telnetd attack.

From: bow <bow@bow.net>

  I tested this on a FreeBSD 3.4-RELEASE box and it responded "not
  vulnerable". However, the telnetd daemon did signal 11 and core. Hmmm.

  Also I tested it on SCO 3.2 and "SCO OpenServer(TM) Release 5". They both
  returned "vulnerable".

From: tasos <stampolidis@city.academic.gr>

  Slackware 8 according to the scanner is vulnverable but the exploit
  doesn't work. Slackware 8 uses linux netkit 0.17 which is not affected.
  Testing the scanner on a win2k w/ SP2 it crashed the telnetd. Couldn't
  run the exploit against the server.

From: "Leandro Quibem Magnabosco" <leandro@funcitec.rct-sc.br>

  I've tested on Redhat 7.1 and it is vulnerable.

  Telnetd AYT overflow scanner, by Security Point(R)
  Host: 200.135.30.1
  Connected to remote host...
  Sending telnet options... stand by...
  Telnetd on 200.135.30.1 vulnerable

  Fortunatedly, I'm not using telnet on this server, so... I've disabled it.

From: "Willem" <imailtest@onlineok.com>

  I ran the scanner aginst a slack 7.1 and a 8.0 box to see what would
  happen and it said it was vulernable. If it really is or not i dunno.

From: "Tom Stowell" <jts@deforest.k12.wi.us>

  XCONSOLE (actually, TELNETD.NLM) for NetWare 5.1 SP2a appears to be
  vulnerable, although I didn't observe any direct or indirect effects of
  the overflow (i.e.:the service continued responding to requests normally,
  and no error messages were printed to the server console or the logs).

From: Jonas Eriksson <je@sekure.net>

  I can confirm that the following Nokia IPSO releases are not vulnerable
  to the telnetd bug:

  * IPSO-3.2.1-fcs1-11.24.1999-102644-849
  * IPSO-3.3-FCS3-09.14.2000-234849-567
  * IPSO-3.4-FCS4A-06.26.2001-235900-767

-- 
Elias Levy
SecurityFocus.com
http://www.securityfocus.com/
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