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/* *\
/ * * \
/ * * \
/ * * \
/ * System Vulnerabilities * \
| * * |
| * * |
| * * |
| * Another Modernz Presentation * |
| * * |
\ * by * /
\ * Multiphage * /
\ * * /
\ * (C)opyright July 5th, 1992 * /
\ * */
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The Modernz can be contacted at:
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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.
===========================================================================
NeXTstep Configuration Vulnerability
---------------------------------------------------------------------------
Information concerning a vulnerability in release 2 of NeXTstep's
NetInfo default configuration. This vulnerability will be corrected
in future versions of NeXTstep.
---------------------------------------------------------------------------
I. Description
By default, a NetInfo server process will provide information to
any machine that requests it.
II. Impact
Remote users can gain unauthorized access to the network's
administrative information such as the passwd file.
III. Solution
Ensure that the trusted_networks property of each NetInfo domain's
root NetInfo directory is set correctly, so that only those systems
which should be obtaining information from NetInfo are granted
access. The value for the trusted_networks property should be the
network numbers of the networks the server should trust.
Note that improperly setting trusted_networks can render your
network unusable.
Consult Chapter 16, "Security", of the "NeXT Network and System
Administration" manual for release 2 for details on setting the
trusted_networks property of the root NetInfo directory.