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S-94-06.asc
Posted Jan 10, 2000

Subject SunOS /usr/ucb/rdist Vulnerability Date 18-Mar-94

systems | solaris
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S-94-06.asc

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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 to CERT-NL information contained in this advisory are therefore outdated.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 : CERT-NL (Don Stikvoort) Index : S-94-06
Distribution : World Page : 1
Classification: External Version: Final
Subject : SunOS /usr/ucb/rdist Vulnerability Date : 18-Mar-94
(plus rdist addendum for non-SunOS systems)
===============================================================================

CERT-NL received information on a vulnerability in /usr/ucb/rdist in
SunOS 4.1.1 / 4.1.2 / 4.1.3 / 4.1.3c on sun3 and sun4.

Concerning non-SunOS systems CERT-NL appended an overview of older information.

The vulnerability is being actively exploited, so take care.

All honours to CERT/CC as provider of the following information
(slightly abridged version):

===============================================================================


The CERT Coordination Center has received information concerning a
vulnerability in /usr/ucb/rdist in Sun Microsystems, Inc. SunOS 4.1.1,
4.1.2, 4.1.3, and 4.1.3c on all sun3 and sun4 architectures. SunOS 4.1.3_U1,
Solaris 2.x, and Solbourne's 4.1B and 4.1C are not vulnerable.

This is a Sun specific Advisory. Please reference the 1991 CERT Advisory
CA-91:20 "/usr/ucb/rdist Vulnerability" for general information regarding
other vendors, plus the corresponding (updated!) vendor status file
rdist-patch-status, BOTH APPENDED AT THE END OF THIS ADVISORY.

This vulnerability is being actively exploited; please review:
CERT-NL Advisory S-94-02 "Ongoing Network Monitoring Attacks".

Patches can be obtained from local Sun Answer Centers worldwide as well as
through anonymous FTP from:
ftp.nic.surfnet.nl in the surfnet/net-security/cert-nl/patches/sun-fixes
directory.

Information concerning specific patches is outlined below. Please note
that Sun sometimes updates patch files. Information regarding these changes
ARE documented by Sun and mirrored in the afore mentioned directory. If in
doubt please contact Sun.

- -----------------------------------------------------------------------------

I. Description

A security vulnerability exists in /usr/ucb/rdist that
can be used to gain unauthorized privileges. Under some
circumstances /usr/ucb/rdist can be used to create setuid
root programs.

II. Impact

This vulnerability allows a local user to gain root access.

III. Solution

A. If rdist is not being used, change the permissions on the file.

# chmod 700 /usr/ucb/rdist

B. Obtain and install the appropriate patches according to the
instructions included with the patches.

Module Patch ID Filename
---------- --------- ---------------
rdist 100383-06 100383-06.tar.Z

BSD Checksum = 58984 121
System V Checksum = 9125 241
MD5 Checksum = f8f78ddab19af5efabb9bd66fc8f5c1a


==============================================================================
APPENDIX CA-91:20 :
====================


CA-91:20 CERT Advisory
October 22, 1991
/usr/ucb/rdist Vulnerability

- ---------------------------------------------------------------------------

The Computer Emergency Response Team/Coordination Center (CERT/CC) has
received information concerning a vulnerability in /usr/ucb/rdist (the
location of rdist may vary depending on the operating system). This
vulnerability is present in possibly all versions of rdist. Vendors
responding with patches are listed below. Additionally, some vendors
who do not include rdist in their operating systems are identified.
Operating systems from vendors not listed in either of the two categories
below will probably be affected and the CERT/CC has proposed a workaround
for those systems.

VENDORS THAT DO NOT SHIP rdist
(Note: Even though these vendors do not ship rdist, it may have been
added later (for example, by the system administrator). It is
also possible that vendors porting one of these operating systems
may have added rdist. In both cases corrective action must be taken.)

Amdahl
AT&T System V
Data General DG/UX for AViiON Systems


VENDORS PROVIDING PATCHES :

see file rdist-patch-status APPENDED BELOW.


All trademarks are the property of their respective holders.
- ---------------------------------------------------------------------------

I. Description

A security vulnerability exists in /usr/ucb/rdist that
can be used to gain unauthorized privileges. Under some
circumstances /usr/ucb/rdist can be used to create setuid
root programs.

II. Impact

Any user logged into the system can gain root access.

III. Solution

A. If available, install the appropriate patch provided by
your operating system vendor.

B. If no patch is available, restrict the use of /usr/ucb/rdist
by changing the permissions on the file.

# chmod 711 /usr/ucb/rdist

- ---------------------------------------------------------------------------
The CERT/CC wishes to thank Casper Dik of the University of Amsterdam,
The Netherlands, for bringing this vulnerability to our attention.
We would also like to thank the vendors who have responded to this problem.
- ---------------------------------------------------------------------------


===========================================================================
APPENDIX rdist-patch-status :
=============================

Rev. 17 Mar 94

I. Vendors that do not include rdist in their operating system
distributions:

Amdahl
AT&T System V
Data General DG/UX for AViiON Systems
Sequent Computer Systems (note they will begin to ship rdist
in February 1992, but it will be the corrected version)

II. Vendors providing patches:

A. Apollo Domain/OS SR10.3 and SR10.3.5 (Fixed in SR10.4)

a88k PD92_P0316
m68k PD92_M0384

HP customers should contact their local response center to obtain
patches.

B. Cray Research, Inc. UNICOS 6.0/6.E/6.1 Field Alert #132 SPR 47600

For further information contact the Support Center at 1-800-950-CRAY or
612-683-5600 or e-mail support@crayamid.cray.com.

C. IBM RS/6000 AIX levels 3005, 2006, 2007, and 3.2 apar ix23738

Patches may be obtained by calling Customer Support at 1-800-237-5511.

D. MIPS RISCos versions 4.50 through 4.52 (not required for 5.0)

Patches are available via anonymous ftp at ftp.mips.com.
The file is /pub/rdist.CERT.tar.

E. NeXT Computer, Inc. NeXTstep Release 2.x

A new version of rdist may be obtained from your
authorized NeXT Support Center. If you are an authorized
support center, please contact NeXT through your normal
channels. NeXT also plans to make this new version of
rdist available on the public NeXT FTP archives.

F. Silicon Graphics IRIX 3.3.x/4.0 (fixed in 4.0.1)

Patches may be obtained via anonymous ftp from sgi.com in the
sgi/rdist directory.

G. Solbourne OS/MP 4.1A Patch ID P911121003

H. Sun Microsystems, Inc.

SunOS 4.0.3/4.1.1/4.1.2/4.1.3/4.1.3c sun3/sun4 architectures
PatchID 100383-06

Patches can be obtained from local Sun Answer Centers worldwide
as well as through anonymous FTP from:
ftp.nic.surfnet.nl in the
surfnet/net-security/cert-nl/patches/sun-fixes directory.


==============================================================================
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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