-----BEGIN PGP SIGNED MESSAGE-----

===============================================================================
Security Advisory                                                       CERT-NL
===============================================================================
Author/Source : Teun Nijssen                                Index  :    S-97-05
Distribution  : World                                       Page   :          1
Classification: External                                    Version:          1
Subject       : talkd                                       Date   :  27-Jan-97
===============================================================================

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

CERT Coordination Center advisory CA-97:04 reports a vulnerability
in talkd, the daemon responding to 'talk'. Expoitation scripts have been
published.

This vulnerability allows remotely executing arbitrary commands with root
privileges.

This advisory provides patch information specific to talkd, but also
recommends to have DNS name services configured in such a way that
a whole class of network services problems is avoided.

CERT-NL recommends to act on CERT-CC's info.

Additional information with regards to this vulnerability is placed in
the README file associated with the advisory. You are encouraged to check
on README file updates regularly. You can automate that process by using
the CERT-NL notifier service.

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

> ftp://ftp.surfnet.nl/surfnet/net-security/cert-cc-mirror/cert_advisories/CA-97:04.tal
> kd
> ftp://ftp.surfnet.nl/surfnet/net-security/cert-cc-mirror/cert_advisories/CA-97:talkd.
> README

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.
==============================================================================


-----BEGIN PGP SIGNATURE-----
Version: 2.6.3i
Charset: cp850

iQCVAgUBMu0aYEU5nQkWIq1FAQHHWAP/T1YlYTOV0+pUWZwNtIWgXoyq+UMmtTou
iUm3PKvzRJVEaYRHYdjzbXPoSuZtHt1wFEWLKuAJk6+nD2EM2e9Dj5BJKThrQQ4K
vM0y4n4SBC34Lf/B+Gax6/H3T3BLTlSYH6ROYSM42s4+QxDQDtHMrhSBeOs17uB1
soXH0frpHEE=
=K4Wl
-----END PGP SIGNATURE-----