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Security Advisory                                                       CERT-NL
===============================================================================
Author/Source : Nico de Koo                                 Index  :    S-96-21
Distribution  : World                                       Page   :          1
Classification: External                                    Version:          1
Subject       : Vulnerability in rpc.statd                  Date   :  24-Apr-96
===============================================================================

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

CERT Coordination Center advisory CA-96:09 reports a vulnerability in
rpc.statd (rpc.statd is also known as statd on some systems). As of the date
of this advisory, we have received no reports of this vulnerability being
exploited.

This vulnerability allows any file that root could remove can be removed by 
rpc.statd. Any file that root could create can be created by rpc.statd, albeit 
with mode 200.

The general solution to this problem is to replace the rpc.statd daemon
with one that validates the information sent to it by the remote rpc.lockd.

CERT-NL recommends application of the recommendation provided in CA-96:09

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:

ftp://ftp.surfnet.nl/surfnet/net-security/cert-cc-mirror/
         cert_advisories/CA-96.09.rpc.statd                  
ftp://ftp.surfnet.nl/surfnet/net-security/cert-cc-mirror/
         cert_advisories/CA-96.09.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.
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