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===============================================================================
Security Advisory                                                       CERT-NL
===============================================================================
Author/Source : Teun Nijssen                                Index  :    S-97-08
Distribution  : World                                       Page   :          1
Classification: External                                    Version:          1
Subject       : rlogin-term                                 Date   :   6-feb-97
===============================================================================

By courtesy of CERT Coordination Center we received the following information.

CERT Coordination Center advisory CA-97:06 reports a vulnerability
in many implementations of rlogin, including eklogin and klogin.

By exploiting this vulnerability, users with access to an account on the
system can cause a buffer overflow and execute arbitrary programs as root.

The CERT/CC advisory recommends installing a supplied vendor patch for this
problem. Until you can do so, we urge you to turn off rlogin or replace it
with a supplied wrapper.

CERT-NL recommends to handle according to the CERT-CC advise (or better yet
to avoid the r-series utilities completely).

All CERT Coordination Center advisories and README's are mirrored by CERT-NL.
The specific URL's for this case will be:

> ftp://ftp.surfnet.nl/surfnet/net-security/cert-cc-mirror/cert_advisories/CA-97.06.rlo
> gin-term
> ftp://ftp.surfnet.nl/surfnet/net-security/cert-cc-mirror/cert_advisories/CA-97:06.REA
> DME

The CERT Coordination Center staff thanks AUSCERT and DFN-CERT for their
contributions to the development of this advisory.

More information about the CERT-NL mirror and notifier services is
contained in News items N-95-01 (notifier) and N-95-02 (CERT mirror),
both present on ftp://ftp.surfnet.nl/surfnet/net-security/cert-nl/docs/news/

==============================================================================

CERT-NL is the Computer Emergency Response Team for SURFnet customers.
SURFnet is the Dutch network for educational, research and related institutes.
CERT-NL is a member of the Forum of Incident Response and Security Teams
(FIRST).

All CERT-NL material is available under:
  http://www.surfnet.nl/surfnet/security/cert-nl.html
  ftp://ftp.surfnet.nl/surfnet/net-security

In case of computer or network security problems please contact your
local CERT/security-team or CERT-NL  (if your institute is NOT a SURFnet
customer please address the appropriate (local) CERT/security-team).

CERT-NL is one/two hour(s) ahead of UTC (GMT) in winter/summer,
i.e. UTC+0100 in winter and UTC+0200 in summer (DST).
   Email:     cert-nl@surfnet.nl
   Phone:     +31 302 305 305
   Fax:       +31 302 305 329
   Snailmail: SURFnet bv
              Attn. CERT-NL
              P.O. Box 19035
              NL - 3501 DA  UTRECHT
              The Netherlands
   A 7 * 24 hours phone number is available to SURFnet SSC's and FIRST
   members on request.
==============================================================================



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