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1991-12-18
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**************************************************************************
Security Bulletin 9127 DISA Defense Communications System
19 December 1991 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, & concerns
to security & 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-9127).
**************************************************************************
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! !
! 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. !
! !
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===========================================================================
CA-91:23 CERT Advisory
December 18, 1991
Hewlett Packard/Apollo Domain/OS crp Vulnerability
---------------------------------------------------------------------------
The Computer Emergency Response Team/Coordination Center (CERT/CC)
has received information concerning a vulnerability in the crp facility
in Hewlett Packard/Apollo Domain/OS. This vulnerability is present on all
HP/Apollo Domain/OS SR10 systems up through SR10.3. Patches that address
this problem will be available in the SR10.3 patch tape (~Feb 92) and in
the SR10.4 software release. Contact your local sales office for
more information.
---------------------------------------------------------------------------
I. Description
There is a security problem with the /usr/apollo/bin/crp facility.
A user who is not running crp is not vulnerable to this problem.
II. Impact
A person at a remote or local site can obtain the privileges of
the user who is running crp.
III. Workaround
The suggested workaround is to disable two system calls that are
made by /usr/apollo/bin/crp. The following steps should be
executed by root or another appropriate userid that has the
privilege to write in the directories involved.
1. Create a file "crplib.c" containing the four-line C program:
extern void pad_$dm_cmd(void);
void pad_$dm_cmd() { }
extern void pad_$def_pfk(void);
void pad_$def_pfk() { }
2. Compile this program using '-pic':
(AEGIS) /com/cc crplib.c -pic
(UNIX) /bin/cc -c crplib.c -W0,-pic
3. Copy the result to somewhere accessible to all users (/lib/crplib
is recommended).
(AEGIS) /com/cpf crplib.bin /lib/crplib
(AEGIS) /com/edacl -p root prwx -g wheel rx -w rx /lib/crplib
(UNIX) /bin/cp crplib.o /lib/crplib
(UNIX) /bin/chmod 755 /lib/crplib
4. a) Ensure that all users do an 'inlib' of that file before running crp.
One way to ensure this would be to replace the /usr/apollo/bin/crp
command by a shell script that does the inlib. Doing this step
will force crp to use the null functions defined in step 1 above.
(AEGIS) /com/chn /usr/apollo/bin/crp crp.orig
(UNIX) /bin/mv /usr/apollo/bin/crp /usr/apollo/bin/crp.orig
b) Create the file /usr/apollo/bin/crp containing the shell script:
(AEGIS) #!/com/sh
/com/sh -c inlib /lib/crplib ';' /usr/apollo/bin/crp.orig ^*
(UNIX) #!/bin/sh
inlib /lib/crplib
exec /usr/apollo/bin/crp.orig "$@"
c) Make this script executable.
(AEGIS) /com/edacl -p root prwx -g wheel rx -w rx /usr/apollo/bin/crp
(UNIX) /bin/chmod 755 /usr/apollo/bin/crp
---------------
NOTE: This workaround will prevent crp from making use of the two
system calls; and therefore, it may affect the functionality of various
software programs since they will be unable to define programmable
function keys, create new windows on the client node, or execute
background processes using the Display Manager interface.
---------------------------------------------------------------------------
The CERT/CC wishes to thank Paul Szabo of the University of Sydney for
bringing this problem to our attention and providing a workaround.
We would also like to thank Jim Richardson of the University of Sydney for
his assistance and Hewlett Packard/Apollo for their timely response to the
report of this vulnerability.
---------------------------------------------------------------------------
If you believe that your system has been compromised, contact CERT/CC via
telephone or e-mail.
Internet E-mail: cert@cert.sei.cmu.edu
Telephone: 412-268-7090 (24-hour hotline)
CERT/CC personnel answer 7:30a.m.-6:00p.m. EST(GMT-5)/EDT(GMT-4),
on call for emergencies during other hours.
Computer Emergency Response Team/Coordination Center (CERT/CC)
Software Engineering Institute
Carnegie Mellon University
Pittsburgh, PA 15213-3890
Past advisories and other information related to computer security are
available for anonymous ftp from the cert.sei.cmu.edu (192.88.209.5) system.