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S-98-38.asc
Posted Jan 10, 2000

Subject SGI IRIX mediad vulnerability Date 18-Jun-98

systems | irix
SHA-256 | a2c07298a7b24b0cd0e290eae0bc0d1e5ebf392a2377b719677e425172733257

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===============================================================================
>> CERT-NL, 01-Mar-2000 <<
>> All CERT-NL information has been moved to http://cert.surfnet.nl. Links <<
>> to CERT-NL information contained in this advisory are therefore outdated. <<
>> <<
>> CERT-NL also has stopped the CERT-CC-Mirror service. Due to this the <<
>> links to the CERT-CC mirror are obsolete. Visit the CERT-CC site for the <<
>> complete CERT-CC advisory texts: http://www.cert.org <<
===============================================================================
===============================================================================
Security Advisory CERT-NL
===============================================================================
Author/Source : Niels den Otter Index : S-98-38
Distribution : World Page : 1
Classification: External Version: 1
Subject : SGI IRIX mediad vulnerability Date : 18-Jun-98
===============================================================================
By courtesy of Silicon Graphics, Inc. we received information on a Vulnerability
in IRIX mediad(1M).

CERT-NL recommends to install patches if these are available for the IRIX OS
version or else to stop running mediad(1M).

______________________________________________________________________________
Silicon Graphics Inc. Security Advisory

Title: IRIX mediad(1M) Vulnerability
Number: 19980602-01-PX
Date: June 17, 1998
_____________________________________________________________________________

Silicon Graphics provides this information freely to the SGI user community
for its consideration, interpretation, implementation and use. Silicon
Graphics recommends that this information be acted upon as soon as possible.

Silicon Graphics provides the information in this Security Advisory on
an "AS-IS" basis only, and disclaims all warranties with respect thereto,
express, implied or otherwise, including, without limitation, any warranty
of merchantability or fitness for a particular purpose. In no event shall
Silicon Graphics be liable for any loss of profits, loss of business, loss
of data or for any indirect, special, exemplary, incidental or consequential
damages of any kind arising from your use of, failure to use or improper
use of any of the instructions or information in this Security Advisory.
______________________________________________________________________________

- - ------------------------
- - ---- Issue Specifics ---
- - ------------------------

The IRIX mediad(1M) daemon is used to monitor removable media devices on
Silicon Graphics Inc. (SGI) platforms.

Unfortunately, a vulnerability has been discovered in the default behavior
of the mediad(1M) program that can lead to a root compromise of the system.

Silicon Graphics Inc. has investigated the issue and recommends the
following steps for neutralizing the exposure. It is HIGHLY RECOMMENDED
that these measures be implemented on ALL vulnerable SGI systems. This
issue will be corrected in future releases of IRIX.



- - ---------------
- - ---- Impact ---
- - ---------------

The mediad(1M) daemon is installed by default on all IRIX 5.1 through
IRIX 6.4 systems.

Physical access to the removable media devices on the system and a local
account is required in order to exploit the mediad(1M) vulnerability
locally and remotely.

It is believed that this vulnerability has not been publically discussed.



- - ---------------------------
- - ---- Temporary Solution ---
- - ---------------------------

Although patches are available for this issue, it is realized that
there may be situations where installing the patches immediately may
not be possible.

The steps below can be used to remove the vulnerability by deactivating the
mediad(1M) program.


1) Become the root user on the system.

% /bin/su -
Password:
#


2) Stop the currently running mediad(1M) daemon.

# /etc/init.d/mediad stop

************
*** NOTE ***
************

With this workaround in place, removable media devices
will need to be mounted manually (see man mount(1M)).


3) Turn off mediad(1M) during system start up.

# chkconfig mediad off

************
*** NOTE ***
************

After installing the patch, the mediad(1M) daemon needs to be
reactivated during system startup with "chkconfig mediad on".


4) Return to the previous user level.

# exit
%



- - -----------------
- - ---- Solution ---
- - -----------------

OS Version Vulnerable? Patch # Other Actions
---------- ----------- ------- -------------

IRIX 3.x no
IRIX 4.x no
IRIX 5.0.x no
IRIX 5.1.x yes not avail Note 1 & 2
IRIX 5.2 yes not avail Note 1 & 2
IRIX 5.3 yes 3191 & 3189 Note 3
IRIX 6.0.x yes not avail Note 1 & 2
IRIX 6.1 yes not avail Note 1 & 2
IRIX 6.2 yes 3192 & 3190 Note 3
IRIX 6.3 yes 3109
IRIX 6.4 yes 2891
IRIX 6.5 no


NOTES

1) Upgrade to currently supported IRIX operating system.
2) See "Temporary Solution" section.
3) Both patches must be installed to fix this vulnerability.


Patches are available via anonymous FTP and your service/support provider.

The SGI anonymous FTP site is sgigate.sgi.com (204.94.209.1) or its
mirror, ftp.sgi.com. Security information and patches can be found
in the ~ftp/security and ~ftp/patches directories, respectfully.



##### Patch File Checksums ####

The actual patch will be a tar file containing the following files:

Filename: README.patch.2891
Algorithm #1 (sum -r): 65078 14 README.patch.2891
Algorithm #2 (sum): 8485 14 README.patch.2891
MD5 checksum: 6CC3D4F3BE85D06B617F2B3BC5E1238A

Filename: patchSG0002891
Algorithm #1 (sum -r): 57624 7 patchSG0002891
Algorithm #2 (sum): 20791 7 patchSG0002891
MD5 checksum: 6223FA28BD1DBA56D5B23460C333B46E

Filename: patchSG0002891.eoe_man
Algorithm #1 (sum -r): 27548 213 patchSG0002891.eoe_man
Algorithm #2 (sum): 56163 213 patchSG0002891.eoe_man
MD5 checksum: 65AC7DF8E13EB22CCCF0396B14DF6DDC

Filename: patchSG0002891.eoe_sw
Algorithm #1 (sum -r): 45137 1334 patchSG0002891.eoe_sw
Algorithm #2 (sum): 48791 1334 patchSG0002891.eoe_sw
MD5 checksum: 5B41401985E06CCA4D9CA6047FAA24E6

Filename: patchSG0002891.idb
Algorithm #1 (sum -r): 25936 14 patchSG0002891.idb
Algorithm #2 (sum): 42399 14 patchSG0002891.idb
MD5 checksum: F132FA43FE61F4029366B98EF046327F

Filename: README.patch.3109
Algorithm #1 (sum -r): 24400 15 README.patch.3109
Algorithm #2 (sum): 63902 15 README.patch.3109
MD5 checksum: 9C48F6AE738A3F4292FD0D6F000715AA

Filename: patchSG0003109
Algorithm #1 (sum -r): 46958 9 patchSG0003109
Algorithm #2 (sum): 39809 9 patchSG0003109
MD5 checksum: F65CE9E7A3A5B6D2076296083581A22B

Filename: patchSG0003109.dev_sw
Algorithm #1 (sum -r): 46222 178 patchSG0003109.dev_sw
Algorithm #2 (sum): 23608 178 patchSG0003109.dev_sw
MD5 checksum: C5D0EEE1B926775061D010539492FF5A

Filename: patchSG0003109.eoe_man
Algorithm #1 (sum -r): 64305 193 patchSG0003109.eoe_man
Algorithm #2 (sum): 53808 193 patchSG0003109.eoe_man
MD5 checksum: 82D8BB5FCF5A92DD05F10A0D396C8624

Filename: patchSG0003109.eoe_sw
Algorithm #1 (sum -r): 52088 2937 patchSG0003109.eoe_sw
Algorithm #2 (sum): 51862 2937 patchSG0003109.eoe_sw
MD5 checksum: A792DD15489134388DF31F0F034D776B

Filename: patchSG0003109.idb
Algorithm #1 (sum -r): 48217 18 patchSG0003109.idb
Algorithm #2 (sum): 20609 18 patchSG0003109.idb
MD5 checksum: EFA2C899D4C7F96DF14943565A635097

Filename: README.patch.3189
Algorithm #1 (sum -r): 18440 8 README.patch.3189
Algorithm #2 (sum): 40866 8 README.patch.3189
MD5 checksum: B2DB0593855AE0616424A9ACEFB9472C

Filename: patchSG0003189
Algorithm #1 (sum -r): 23323 1 patchSG0003189
Algorithm #2 (sum): 29291 1 patchSG0003189
MD5 checksum: 67B68302F224057E26F8C529E4BCE85F

Filename: patchSG0003189.eoe2_sw
Algorithm #1 (sum -r): 16009 89 patchSG0003189.eoe2_sw
Algorithm #2 (sum): 2007 89 patchSG0003189.eoe2_sw
MD5 checksum: CDAE8AC5BFE7153C0C86B35850FE6988

Filename: patchSG0003189.idb
Algorithm #1 (sum -r): 10773 1 patchSG0003189.idb
Algorithm #2 (sum): 36164 1 patchSG0003189.idb
MD5 checksum: 58EFBA4F9DF09BE37AF0438C5BE49401

Filename: README.patch.3190
Algorithm #1 (sum -r): 46303 8 README.patch.3190
Algorithm #2 (sum): 33172 8 README.patch.3190
MD5 checksum: 50A5ADF39FA1F9E1AD25550BFCC2D54F

Filename: patchSG0003190
Algorithm #1 (sum -r): 01530 1 patchSG0003190
Algorithm #2 (sum): 36083 1 patchSG0003190
MD5 checksum: 8F34CF99C67D0D227D327E4DE44D40FF

Filename: patchSG0003190.eoe_sw
Algorithm #1 (sum -r): 14428 92 patchSG0003190.eoe_sw
Algorithm #2 (sum): 26222 92 patchSG0003190.eoe_sw
MD5 checksum: 1ACA704D3473FB27E1F41E52C8A66425

Filename: patchSG0003190.idb
Algorithm #1 (sum -r): 05639 1 patchSG0003190.idb
Algorithm #2 (sum): 36623 1 patchSG0003190.idb
MD5 checksum: F9CD42450BC0278E7A4E2A5D5E1C2015

Filename: README.patch.3191
Algorithm #1 (sum -r): 06248 11 README.patch.3191
Algorithm #2 (sum): 31452 11 README.patch.3191
MD5 checksum: 50E04AA8709A56B3D882B26B990E58BB

Filename: patchSG0003191
Algorithm #1 (sum -r): 04873 7 patchSG0003191
Algorithm #2 (sum): 45621 7 patchSG0003191
MD5 checksum: B1DD09FD9CA77204DD0816A9D733FEDD

Filename: patchSG0003191.cadmin_sw
Algorithm #1 (sum -r): 24160 706 patchSG0003191.cadmin_sw
Algorithm #2 (sum): 25993 706 patchSG0003191.cadmin_sw
MD5 checksum: 75EFC916866460DB0CE205B781BD3DFF

Filename: patchSG0003191.eoe1_man
Algorithm #1 (sum -r): 24451 12 patchSG0003191.eoe1_man
Algorithm #2 (sum): 4655 12 patchSG0003191.eoe1_man
MD5 checksum: 7B690D29231DD4401845369CF88B080E

Filename: patchSG0003191.eoe1_sw
Algorithm #1 (sum -r): 07943 6 patchSG0003191.eoe1_sw
Algorithm #2 (sum): 58262 6 patchSG0003191.eoe1_sw
MD5 checksum: D13FA81DF060BE27DA6F0478CA4D0476

Filename: patchSG0003191.eoe2_sw
Algorithm #1 (sum -r): 23461 135 patchSG0003191.eoe2_sw
Algorithm #2 (sum): 9315 135 patchSG0003191.eoe2_sw
MD5 checksum: 4BF6904EDCBB08A6C52664DABAE80817

Filename: patchSG0003191.idb
Algorithm #1 (sum -r): 21800 3 patchSG0003191.idb
Algorithm #2 (sum): 48342 3 patchSG0003191.idb
MD5 checksum: 889A725DA53EADA27B4C2E65F22A3296

Filename: README.patch.3192
Algorithm #1 (sum -r): 14737 9 README.patch.3192
Algorithm #2 (sum): 25649 9 README.patch.3192
MD5 checksum: 6CEF0C3571C086FBEC1E4FE8EF761DD2

Filename: patchSG0003192
Algorithm #1 (sum -r): 47927 3 patchSG0003192
Algorithm #2 (sum): 18593 3 patchSG0003192
MD5 checksum: 9251DC46B0F1EC1E783C40BB7EEF9D12

Filename: patchSG0003192.eoe_man
Algorithm #1 (sum -r): 60164 13 patchSG0003192.eoe_man
Algorithm #2 (sum): 53577 13 patchSG0003192.eoe_man
MD5 checksum: 7999BF4A4E20EA3EAB1AF82DBC233293

Filename: patchSG0003192.eoe_sw
Algorithm #1 (sum -r): 10318 160 patchSG0003192.eoe_sw
Algorithm #2 (sum): 30308 160 patchSG0003192.eoe_sw
MD5 checksum: E2382D48673F2C3D15BAB821F5D570F7

Filename: patchSG0003192.idb
Algorithm #1 (sum -r): 30067 2 patchSG0003192.idb
Algorithm #2 (sum): 61532 2 patchSG0003192.idb
MD5 checksum: 360AA4EF675AA8EFEBB1B5CDE3534017



- - -------------------------
- - ---- Acknowledgments ---
- - -------------------------

Silicon Graphics wishes to thank the Internet community at large for their
assistance in this matter.


- - ------------------------------------------------------------
- - ---- Silicon Graphics Inc. Security Information/Contacts ---
- - ------------------------------------------------------------

If there are questions about this document, email can be sent to
cse-security-alert@sgi.com.


==============================================================================
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://cert.surfnet.nl/

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 ATTENDED REGULARLY ALL DAYS
Phone: +31 302 305 305 BUSINESS HOURS ONLY
Fax: +31 302 305 329 BUSINESS HOURS ONLY
Snailmail: SURFnet bv
Attn. CERT-NL
P.O. Box 19035
NL - 3501 DA UTRECHT
The Netherlands

NOODGEVALLEN: 06 22 92 35 64 ALTIJD BEREIKBAAR
EMERGENCIES : +31 6 22 92 35 64 ATTENDED AT ALL TIMES
CERT-NL'S EMERGENCY PHONENUMBER IS ONLY TO BE USED IN CASE OF EMERGENCIES:
THE SURFNET HELPDESK OPERATING THE EMERGENCY NUMBER HAS A *FIXED*
PROCEDURE FOR DEALING WITH YOUR ALERT AND WILL IN REGULAR CASES RELAY IT
TO CERT-NL IN AN APPROPRIATE MANNER. CERT-NL WILL THEN CONTACT YOU.
===============================================================================

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