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Subject: (AUSCERT ESB-98.009) CERT Advisory CA-98.02 - Vulnerabilities in CDE
Precedence: list
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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-98.009 -- CERT Advisory CA-98.02
Vulnerabilities in CDE
22 January 1998
===========================================================================
The CERT Coordination Center has released the following advisory concerning
several vulnerabilities in the Common Desktop Environment. These
vulnerabilities may allow users to gain unauthorized privileged access or
cause a denial of service on the system.
The following security bulletin is provided as a service to AUSCERT's
members. As AUSCERT did not write this document, AUSCERT has had no
control over its content. As such, the decision to use any or all of this
information is the responsibility of each user or organisation, and should
be done so in accordance with site policies and procedures.
NOTE: This is only the original release of the security bulletin. It will
not be updated when the original bulletin is. If downloading at a later
date, it is recommended that the bulletin is retrieved from the original
authors to ensure that the information is still current.
Contact information for CERT is included in the Security Bulletin below.
If you have any questions or need further information, please contact them
directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/Information/advisories.html
If you believe that your system has been compromised, contact AUSCERT or your
representative in FIRST (Forum of Incident Response and Security Teams).
Internet Email: auscert@auscert.org.au
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AUSCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for emergencies.
Facsimile: (07) 3365 7031
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=============================================================================
CERT* Advisory CA-98.02
Original issue date: Jan. 21, 1998
Last revised: --
Topic: Vulnerabilities in CDE
- - - -----------------------------------------------------------------------------
The CERT Coordination Center has received reports of several vulnerabilities
in some implementations of the Common Desktop Environment (CDE). The root
cause of these vulnerabilities is that the dtappgather program does not
adequately check all information passed to it by users. As a result, it is
possible for a local user to gain unauthorized privileged access or cause a
denial of service on the system.
We recommend installing a vendor patch as soon as possible. Until you can do
so, we encourage you to disable vulnerable copies of the program. Section
III.A. of this advisory contains information on checking for potentially
vulnerable copies and disabling them. Section III.B and the appendix contain
vendor information.
We will update this advisory as we receive additional information. Please
check our advisory files regularly for updates that relate to your site.
- - - -----------------------------------------------------------------------------
I. Description
There are several vulnerabilities in some implementations of the Common
Desktop Environment (CDE). The root cause of these vulnerabilities is
that the setuid root program "dtappgather" does not adequately check all
information passed to it by users. By exploiting these vulnerabilities,
an attacker can gain either unauthorized privileged access or cause a
denial of service on the system.
II. Impact
Local users are able to gain write access to arbitrary files. This can be
leveraged to gain privileged access.
Local users may also be able to remove files from arbitrary directories,
thus causing a denial of service.
III. Solution
We recommend installing a vendor patch as soon as possible and disabling
the vulnerable program until you can do so. Instructions for determining
whether you have a potentially vulnerable version of this program are
given in Section A. Vendor patches are discussed in Section B.
A. How to check for and disable potentially vulnerable versions of
dtappgather
To find potentially vulnerable versions of dtappgather and to
disable those programs, use the following find(1) command or a
variant. Consult your local system documentation to determine how
to tailor the find(1) program on your system.
You will need to run the find(1) command on each system you
maintain because the command examines files on local disks only.
Substitute the names of your local file systems for
FILE_SYSTEM_NAMES in the example. Example local file system names
are /, /usr, and /var. You should do this as root.
Note that this is one long command, though we have separated
it onto three lines using backslashes.
find FILE_SYSTEM_NAMES -xdev -type f -user root \
-name 'dtappgather' -perm -04000 -exec ls -l '{}' \; \
-ok chmod u-s '{}' \;
This command will find all files on a system that
- are only in the file systems you name (FILE_SYSTEM_NAMES -xdev)
- are regular files (-type f)
- are owned by root (-user root)
- have the name "dtappgather" (-name 'dtappgather')
- are setuid (-perm -04000)
Once found, those files will
- have their names and details printed (-exec ls -l '{}')
- no longer be setuid root, but only if you type `y' in
response to the prompt (-ok chmod u-s '{}' \;)
Until you are able to install the appropriate patch, we recommend
that you remove the setuid bit from the dtappgather program. Note
that doing this will affect the functionality of the dtappgather
program for some users. For example, newly created users that have
not logged into the CDE desktop may not have any icons in the
Application Manager window; existing users may not notice any
change in functionality.
B. Obtain and install a patch for this problem.
If your vendor has a patch for this problem, we encourage you to
apply the patch as soon as possible.
Appendix A contains a list of vendors who have provided information
about this problem. We will update the appendix as we receive more
information. If you do not see your vendor's name, the CERT/CC did
not hear from that vendor. Please contact your vendor directly.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Appendix A - Vendor Information
Below is a list of the vendors who have provided information for this
advisory. We will update this appendix as we receive additional information.
If you do not see your vendor's name, the CERT/CC did not hear from that
vendor. Please contact the vendor directly.
Digital Equipment Corporation
- - - ------------------------------
At the time of writing this document, patches(binary kits) are in
progress. Distribution of the fix for this problem is expected to begin
soon. Digital will provide notice of the completion/availability of the
patches through AES services (DIA, DSNlink FLASH) and be available from
your normal Digital Support channel.
Hewlett-Packard Company
- - - -----------------------
This problem is addressed HP Security Bulletin 075. This bulletin can be
found at one of these URLs:
http://us-support.external.hp.com
(for US, Canada, Asia-Pacific, & Latin-America)
http://europe-support.external.hp.com
(for Europe)
Security Bulletin 075: Security Vulnerability in CDE on HP-UX
PLATFORM: HP9000 Series 700/800s running CDE on:
HP-UX 10.10, HP-UX 10.20,
HP-UX 10.24 (VVOS),
HP-UX 11.00
SOLUTION: Apply one of:
PHSS_13723 HP-UX 10.10
PHSS_13724 HP-UX 10.20
PHSS_13725 HP-UX 10.30
PHSS_13772 HP-UX 10.24
PHSS_13406 HP-UX 11.00
IBM Corporation
- - - ---------------
The version of dtappgather shipped with AIX is vulnerable. The
following fixes are in progress:
AIX 3.2: not vulnerable; CDE not shipped in 3.2
AIX 4.1: IX73436
AIX 4.2: IX73437
AIX 4.3: IX73438
To Order
--------
APARs may be ordered using Electronic Fix Distribution (via FixDist)
or from the IBM Support Center. For more information on FixDist,
reference URL:
http://service.software.ibm.com/aixsupport/
or send e-mail to aixserv@austin.ibm.com with a subject of "FixDist".
IBM and AIX are registered trademarks of International Business Machines
Corporation.
The Open Group
- - - --------------
The Open Group is investigating this vulnerability, and if reproduced
will develop a solution and provide a patch for its CDE licensees.
Silicon Graphics, Inc.
- - - ----------------------
Silicon Graphics provides only the third party TriTeal CDE product.
Triteal Corporation provides all support on the SGI offered CDE product.
Customers requiring support on the SGI CDE product should contact TriTeal
Corporation at 1-800-874-8325, or email support@triteal.com.
For other Silicon Graphics related security information, please see the
SGI Security Headquarters website located at:
http://www.sgi.com/Support/security/security.html
Sun Microsystems, Inc.
- - - ----------------------
105837-01 1.2
105837-01 1.2_x86
104498-02 1.02
104500-02 1.02_x86
104497-02 1.01
104499-02 1.01_x86
- - - -----------------------------------------------------------------------------
If you believe that your system has been compromised, contact the CERT
Coordination Center or your representative in the Forum of Incident Response
and Security Teams (see http://www.first.org/team-info/).
CERT/CC Contact Information
- - - ----------------------------
Email cert@cert.org
Phone +1 412-268-7090 (24-hour hotline)
CERT personnel answer 8:30-5:00 p.m. EST(GMT-5) / EDT(GMT-4)
and are on call for emergencies during other hours.
Fax +1 412-268-6989
Postal address
CERT Coordination Center
Software Engineering Institute
Carnegie Mellon University
Pittsburgh PA 15213-3890
USA
Using encryption
We strongly urge you to encrypt sensitive information sent by email. We can
support a shared DES key or PGP. Contact the CERT/CC for more information.
Location of CERT PGP key
ftp://ftp.cert.org/pub/CERT_PGP.key
Getting security information
CERT publications and other security information are available from
http://www.cert.org/
ftp://ftp.cert.org/pub/
CERT advisories and bulletins are also posted on the USENET newsgroup
comp.security.announce
To be added to our mailing list for advisories and bulletins, send
email to
cert-advisory-request@cert.org
In the subject line, type
SUBSCRIBE your-email-address
- - - ---------------------------------------------------------------------------
Copyright 1998 Carnegie Mellon University. Conditions for use, disclaimers,
and sponsorship information can be found in
http://www.cert.org/legal_stuff.html and ftp://ftp.cert.org/pub/legal_stuff .
If you do not have FTP or web access, send mail to cert@cert.org with
"copyright" in the subject line.
*CERT is registered in the U.S. Patent and Trademark Office.
- - - ---------------------------------------------------------------------------
This file: ftp://ftp.cert.org/pub/cert_advisories/CA-98.02.CDE
http://www.cert.org/pub/alerts.html
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Revision history
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