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**************************************************************************
Security Bulletin 9223 DISA Defense Communications System
September 24, 1992 Published by: DDN Security Coordination Center
(SCC@NIC.DDN.MIL) 1-(800) 365-3642
DEFENSE DATA NETWORK
SECURITY BULLETIN
The DDN SECURITY BULLETIN is distributed by the DDN SCC (Security
Coordination Center) under DISA contract as a means of communicating
information on network and host security exposures, fixes, and concerns
to security and management personnel at DDN facilities. Back issues may
be obtained via FTP (or Kermit) from NIC.DDN.MIL [192.112.36.5]
using login="anonymous" and password="guest". The bulletin pathname is
scc/ddn-security-yynn (where "yy" is the year the bulletin is issued
and "nn" is a bulletin number, e.g. scc/ddn-security-9223).
**************************************************************************
+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
! !
! The following important advisory was issued by the Computer !
! Emergency Response Team (CERT) and is being relayed unedited !
! via the Defense Information Systems Agency's Security !
! Coordination Center distribution system as a means of !
! providing DDN subscribers with useful security information. !
! !
+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
CA-92:16 CERT Advisory
September 22, 1992
VMS Monitor Vulnerability
---------------------------------------------------------------------------
The CERT Coordination Center has received information concerning a
potential vulnerability with Digital Equipment Corporation's VMS
Monitor. This vulnerability is present in V5.0 through V5.4-2 but has
been corrected in V5.4-3 through V5.5-1. The Software Security
Response Team at Digital has provided the following information
concerning this vulnerability.
NOTE: Digital suggests that customers who are unable to upgrade their
systems implement the workaround described below.
For additional information, please contact your local Digital Equipment
Corporation customer service representative.
Beginning of Text provided by Digital Equipment Corporation
==============================================================================
SSRT-0200 PROBLEM: Potential Security Vulnerability Identified in Monitor
SOURCE: Digital Equipment Corporation
AUTHOR: Software Security Response Team - U.S.
Colorado Springs USA
PRODUCT: VMS
Symptoms Identified On: VMS, Versions 5.0, 5.0-1, 5.0-2, 5.1, 5.1-B,
5.1-1, 5.1-2, 5.2, 5.2-1, 5.3,
5.3-1, 5.3-2, 5.4, 5.4-1, 5.4-2
*******************************************************
SOLUTION: This problem is not present in VMS V5.4-3
(released in October 1991) through V5.5-1
(released in July, 1992.)
*******************************************************
Copyright (c) Digital Equipment Corporation, 1992 All Rights Reserved.
Published Rights Reserved Under The Copyright Laws Of The United States.
-------------------------------------------------------------------------------
PROBLEM/IMPACT:
-------------------------------------------------------------------------------
Under certain conditions, unauthorized privileges may be expanded to
authorized users of a system via the Monitor utility. Should a system
be compromised through unauthorized access, there is a risk of potential
damage to a system environment. This vulnerability will not permit
unauthorized persons to acces the system, as individuals attempting to
gain unauthorized access will continue to be denied through the standard
VMS security mechanisms.
-------------------------------------------------------------------------------
SOLUTION:
-------------------------------------------------------------------------------
This potential vulnerability does not exist in VMS V5.4-3
(released in October 1991) and later versions of VMS through V5.5-1.
Digital strongly recommends that you upgrade to a minimum of VMS V5.4-3,
and preferably, to the latest release of VMS V5.5-1 (released in July,
1992).
------------------------------------------------------------------------------
INFORMATION:
-------------------------------------------------------------------------------
If you cannot upgrade at this time, Digital recommends that you
implement a workaround (examples attached below) to avoid any potential
vulnerability.
As always, Digital recommends that you periodically review your system
management and security procedures. Digital will continue to review and
enhance the security features of its products and work with customers to
maintain and improve the security and integrity of their systems.
-------------------------------------------------------------------------------
WORKAROUND
-------------------------------------------------------------------------------
A suggested workaround would be to remove the installed image
SYS$SHARE:SPISHR.EXE via VMS INSTALL and/or restrict the use of
the MONITOR utility to "privileged" system administrators.
Below are examples of doing both.
[1] To disable the MONITOR utility, the image SYS$SHARE:SPISHR.EXE should be
deinstalled.
From a privileged account;
For cluster configurations;
---------------------------
$ MC SYSMAN
SYSMAN> SET ENVIRONMENT/CLUSTER
SYSMAN> DO INSTALL REMOVE SYS$SHARE:SPISHR.EXE
SYSMAN> DO RENAME SYS$SHARE:SPISHR.EXE SPISHR.HOLD
SYSMAN> EXIT
For non-VAXcluster configurations;
---------------------------------
$INSTALL
INSTALL>REMOVE SYS$SHARE:SPISHR.EXE
INSTALL>EXIT
$RENAME SYS$SHARE:SPISHR.EXE SPISHR.HOLD
[2] If you wish to restrict access to the MONITOR command so that only a
limited number of authorized (or privileged) persons are granted access
to the utility, one method might be to issue the following commands:
From a privileged account;
For cluster configurations;
---------------------------
$ MC SYSMAN
SYSMAN> SET ENVIRONMENT/CLUSTER
SYSMAN> DO INSTALL REMOVE SYS$SHARE:SPISHR.EXE
SYSMAN> DO SET FILE/ACL=(ID=*,ACCESS=NONE) SYS$SHARE:SPISHR.EXE
SYSMAN> DO SET FILE/ACL=(ID=SYSTEM,ACCESS=READ+EXECUTE) SYS$SHARE:SPISHR.EXE
SYSMAN> DO INSTALL ADD SYS$SHARE:SPISHR.EXE/OPEN/HEADER/SHARE/PROTECT
SYSMAN> EXIT
$
THIS WILL IMPACT the MONITOR UTILITY FOR REMOTE MONITORING.
LOCAL MONITORING WILL CONTINUE TO WORK FOR PERSONS HOLDING THE ID's
GRANTED ACL ACCESS.
See additional note(s) below
For non-VAXcluster configurations;
----------------------------------
$ INSTALL
INSTALL>REMOVE SYS$SHARE:SPISHR.EXE
INSTALL>EXIT
$ SET FILE /ACL=(ID=*,ACCESS=NONE) SYS$SHARE:SPISHR.EXE
$ SET FILE /ACL=(ID=SYSTEM,ACCESS=READ+EXECUTE) SYS$SHARE:SPISHR.EXE
$ INSTALL
INSTALL>ADD SYS$SHARE:SPISHR.EXE/OPEN/HEADER/SHARE/PROTECT
INSTALL>EXIT
$
IN THE ABOVE EXAMPLES, THE "SET FILE /ACL" LINE SHOULD BE REPEATED FOR
ALL ACCOUNTS THAT ARE REQUIRED/ALLOWED TO USE THE DCL MONITOR COMMAND.
NOTE: The ID -SYSTEM- is an example; as necessary, substitute
valid user ID's associated with accounts you wish to grant
access to.
===========================================================================
End of Text provided by Digital Equipment Corporation
---------------------------------------------------------------------------
CERT wishes to thank Teun Nijssen of CERT-NL (the SURFnet CERT, in the
Netherlands) for bringing this security vulnerability to our attention.
We would also like to thank Digital Equipment Corporation's Software Security
Response Team for providing information on this vulnerability.
---------------------------------------------------------------------------
If you believe that your system has been compromised, contact CERT or
your representative in FIRST (Forum of Incident Response and Security Teams).
Internet E-mail: cert@cert.org
Telephone: 412-268-7090 (24-hour hotline)
CERT personnel answer 7:30 a.m.-6:00 p.m. EST(GMT-5)/EDT(GMT-4),
on call for emergencies during other hours.
CERT Coordination Center
Software Engineering Institute
Carnegie Mellon University
Pittsburgh, PA 15213-3890
Past advisories, information about FIRST representatives, and other
information related to computer security are available for anonymous ftp
from cert.org (192.88.209.5).
****************************************************************************
* *
* The point of contact for MILNET security-related incidents is the *
* Security Coordination Center (SCC). *
* *
* E-mail address: SCC@NIC.DDN.MIL *
* *
* Telephone: 1-(800)-365-3642 *
* *
* NIC Help Desk personnel are available from 7:00 a.m.-7:00 p.m. EST, *
* Monday through Friday except on federal holidays. *
* *
****************************************************************************