Common Desktop Environment (CDE) Subprocess Control Service dtspcd contains buffer overflow

2001-11-12T00:00:00
ID VU:172583
Type cert
Reporter CERT
Modified 2003-08-11T19:00:00

Description

Overview

A remotely exploitable buffer overflow exists in the Common Desktop Environment (CDE) Subprocess Control Service (dtspcd). An attacker who successfully exploits this vulnerability can execute arbitrary code as root.

Description

Internet Security Systems (ISS) X-Force has reported a remotely exploitable buffer overflow in the Common Desktop Environment (CDE) Subprocess Control Service (dtspcd). CDE is an integrated graphical user interface that runs on Unix and Linux operating systems. dtspcd is a network daemon that accepts requests from clients to execute commands and launch applications remotely. On systems running CDE, dtspcd is spawned by the Internet services daemon (typically inetd or xinetd) in response to a CDE client request. dtspcd is typically configured to run on port 6112/tcp with root privileges. dtspcd makes a function call to a shared library, libDTSvc.so.1, that contains a buffer overflow condition in the client connection routine. The buffer overflow can be exploited by a specially crafted CDE client request. Although the buffer overflow occurs in a shared library, the CERT/CC is not aware of any other CDE applications that use the vulnerable function.


Impact

A successful attacker can execute arbitrary code remotely with root privileges.


Solution

Apply Patch

Apply the appropriate vendor supplied patch as described in the vendor section below.


Disable Vulnerable Service

Until a patch can be applied, you may wish to consider disabling dtspcd. Typically, this may be achieved by commenting out the approprate entry in /etc/inetd.conf. As a general practice, CERT/CC recommends disabling any services that are not explicitly required. It is important to carefully consider the consequences of disabling dtspcd in your environment.

/etc/inetd.conf
dtspc stream tcp nowait root /usr/dt/bin/dtspcd /usr/dt/bin/dtspcd
Block or Restrict Access

Monitor or block external access to 6112/tcp. It may be possible to use TCP Wrapper or a similar technology to provide improved access control and logging. Additionally, an application-level firewall may be able to filter requests made to dtspcd.


Vendor Information

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Compaq Computer Corporation __ Affected

Notified: October 29, 2001 Updated: May 30, 2002

Status

Affected

Vendor Statement

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1

UPDATE: (SSRTM541)Tru64 UNIX CDE, NFS and NIS related Potential Security Vulnerabilities
Posted at ``<http://ftp.support.compaq.com/patches/.new/security.shtml>``
NOTICE: There are no restrictions for distribution of this Bulletin provided that it remains complete and intact.

RELEASE DATE: 17 April, 2002 (SSRT-541) LAST UPDATED: 22 May, 2002 (SSRTM541) New Patches
SEVERITY: 1
SOURCE: Compaq Computer Corporation Compaq Services Software Security Response Team
REFERENCE: [security bulletin posted 17 April, 2002] (SSRT-541) Tru64 UNIX CDE, NFS and NIS related Potential Security Vulnerabilities
PROBLEM SUMMARY: A number of potential security vulnerabilities in Tru64 UNIX V4.0F, V4.0G, V5.0A, V5.1 and V5.1A, have recently been reported for CDE, libc, and NFS where, under certain circumstances, system integrity may be compromised by a malicious user.
o CDE (severity high) o dtaction potential buffer overflow (SSRT0752U) o ttsession potential buffer overflow (SSRT0753U) o dtprintinfo potential buffer overflow (SSRT0757U, SSRT0788U) o dtspcd potential buffer overflow. (SSRT0782U) NOTE: cross-reference : (CVE CVE-2001-0803,CERT CA-2001-31, CA-2002-01) Compaq has not been able to reproduce the problem identified in the CERT advisory for any Compaq OS. However with the information available, we are including a code change for dtspcd that will further reduce any potential buffer overflow vulnerability. o Buffer overflow attacks are commonly used to attempt to subvert the function of a privileged program and possibly execute commands at the elevated privileges if the program file has the setuid privilege.
o Environment Variable LANG and LOCPATH (severity high) o libc (SSRT0771U) A libc environment variable corruption with LANG and LOCPATH , may cause a potential buffer overflow
o NIS Network Information Service (severity moderate) o ypbind may core during nmap portscan (SSRT0781U) o Core: A file that is a copy of the contents of a processes memory, that can be produced when that process is aborted by certain kinds of internal error.
o NFS Network File System (severity moderate) o NFS Potential packet flood denial of service (DoS) (SSRT1-26) NOTE: Applies to V4.0g PK3 (BL17) & V5.0a PK3 (BL17) only A remote user with malicious intent may cause a potential denial of service (DoS) with portmap server.
o Network DoS attacks make computer systems inaccessible by flooding a service, server or network with useless traffic.
VERSIONS IMPACTED:
TRU64 UNIX Versions Impacted
V5.1A PK1 (BL1) V5.1 PK4 (BL18) V5.0A PK3 (BL17) V4.0F PK7 (BL18) V4.0G PK3 (BL17)

RESOLUTION:
The potential vulnerabilities noted below have been corrected and newly released patches are now available for TRU64 UNIX.
Compaq strongly recommends that systems be updated to at least the prerequisite version of TRU64 UNIX and PK release, then install the previously released security patches identified in the security bulletin ``<http://ftp.support.compaq.com/patches/.new/html/SSRT0742U-59U.shtml>`` prior to installing the following ERP (Early Release Patch).
UPDATE: 5/22/2002 Updated ERPs are now available for all supported versions of Tru64 UNIX and will be available in the next aggregate patch kits for each supported product version. Until these Tru64 UNIX fixes are available in mainstream patch kits, Compaq recommends use of the following ERP kits:
NOTE: Please review the README file(s) for each patch prior to installation.
The Early Release Patch kits use dupatch to install and will not install over any installed Customer-Specific-Patches (CSPs) which have file intersections with the ERPs. Contact your normal support channel for assistance if the installation of the ERPs are blocked by any of your installed CSPs.
Tru64 UNIX 5.1A PREREQUISITE: Tru64 UNIX 5.1A with PK1 (BL1) installed ERP Kit Name: T64V51AB1-C0011202-14166-ES-20020429.tar Kit Location: ``<http://ftp1.support.compaq.com/public/unix/v5.1a/>`` SUPERCEDES KIT: T64V51AB1-C0011201-13438-ES-20020228

Tru64 UNIX 5.1 PREREQUISITE: Tru64 UNIX 5.1 with PK4 (BL18) installed ERP Kit Name: T64V51B18-C0102003-14238-ES-20020507.tar Kit Location: ``<http://ftp1.support.compaq.com/public/unix/v5.1/>`` SUPERCEDES KIT: T64V51B18-C0102001-13428-ES-20020228

Tru64 UNIX 5.0A PREREQUISITE: Tru64 UNIX 5.0A with PK3 (BL17) installed ERP Kit Name: T64V50AB17-C0018303-14330-ES-20020516.tar Kit Location: ``<http://ftp1.support.compaq.com/public/unix/v5.0a/>`` SUPERCEDES KIT: T64V50AB17-C0018301-13396-ES-20020226

Tru64 UNIX 4.0G PREREQUISITE: Tru64 UNIX 4.0G with PK3 (BL17) installed ERP Kit Name: T64V40GB17-C0010303-14314-ES-20020515.tar Kit Location: ``<http://ftp1.support.compaq.com/public/unix/v4.0g/>`` SUPERCEDES KIT: T64V40GB17-C0010301-13400-ES-20020226

Tru64 UNIX 4.0F PREREQUISITE: Tru64 UNIX 4.0F with PK7 (BL18) installed ERP Kit Name: DUV40FB18-C0067302-14158-ES-20020429.tar Kit Location: ``<http://ftp1.support.compaq.com/public/unix/v4.0f/>`` SUPERCEDES KIT: DUV40FB18-C0067301-13427-ES-20020228

Additional Notes:
The fixes contained in the Early Release Patch (ERP) kits listed above will be available in the following mainstream patch kit(s):
Tru64 UNIX 5.1A PK2 Tru64 UNIX 5.1 PK5 Tru64 UNIX 5.0A PK4 Tru64 UNIX 4.0G PK5 Tru64 UNIX 4.0F PK8
MD5 and SHA1 checksums are available in the public patch notice for the ERP kits. You may find information on how to verify MD5 and SHA1 checksums at ``<http://www.support.compaq.com/patches/whats-new.shtml>``
After completing the update, Compaq strongly recommends that you perform an immediate backup of your system disk so that any subsequent restore operations begin with updated software. Otherwise, you must reapply the update after any future restore operation. Any future upgrades or patch release installations to your system will require the re-application of the appropriate ERP (identified above).
SUPPORT: For further information, contact Compaq Global Services.

SUBSCRIBE:

To subscribe to automatically receive future Security Advisories from the Compaq's Software Security Response Team via electronic mail: ``<http://www.support.compaq.com/patches/mailing-list.shtml>``
REPORT:
To report a potential security vulnerability with any Compaq supported product, send email ``[mailto:security-ssrt@compaq.com](<mailto:security-ssrt@compaq.com>)`` or ``[mailto:sec-alert@compaq.com](<mailto:sec-alert@compaq.com>)``
Compaq appreciates your cooperation and patience. As always, Compaq urges you to periodically review your system management and security procedures. Compaq will continue to review and enhance the security features of its products and work with our customers to maintain and improve the security and integrity of their systems.
"Compaq is broadly distributing this Security Bulletin in order to bring to the attention of users of the affected Compaq products the important security information contained in this Bulletin. Compaq recommends that all users determine the applicability of this information to their individual situations and take appropriate action. Compaq does not warrant that this information is necessarily accurate or complete for all user situations and, consequently, Compaq will not be responsible for any damages resulting from user's use or disregard of the information provided in this Bulletin."
Copyright 2002 Compaq Information Technologies Group, L.P. Compaq shall not be liable for technical or editorial errors or omissions contained herein. The information in this document is subject to change without notice. Compaq and the names of Compaq products referenced herein are, either, trademarks and/or service marks or registered trademarks and/or service marks of Compaq Information Technologies Group, L.P. Other product and company names mentioned herein may be trademarks and/or service marks of their respective owners.
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Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Hewlett-Packard Company __ Affected

Notified: October 29, 2001 Updated: March 08, 2002

Status

Affected

Vendor Statement

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

HEWLETT-PACKARD COMPANY SECURITY BULLETIN: #0175
Originally issued: 12 Nov. 2001
Last revision: **Revision 3** 28 Feb. 2002
-----------------------------------------------------------------

The information in the following Security Bulletin should be acted
upon as soon as possible. Hewlett-Packard Company will not be
liable for any consequences to any customer resulting from customer's
failure to fully implement instructions in this Security Bulletin as
soon as possible.

------------------------------------------------------------------
PROBLEM: Buffer overflow in dtspcd

PLATFORM: HP9000 Series 700/800 running HP-UX releases 10.10,
10.20, 10.24, 11.00, 11.04, and 11.11.

DAMAGE: Possible unauthorized access, possible increased privileges.

** Rev. 3 **
SOLUTION: Install the appropriate patch for the HP-UX release:
10.10 PHSS_25785
10.20 PHSS_25786
10.24 PHSS_26029
11.00 PHSS_25787
--->>>> 11.04 PHSS_26030
11.11 PHSS_25788

MANUAL ACTIONS: None

AVAILABILITY: The patches for 10.10, 10.20, 10.24, 11.00, 11.04,
and 11.11 are available now.

CHANGE SUMMARY: Rev. 1 Patches available for 10.10, 10.20,
11.00, 11.11.
Rev. 2 Patches available for 10.24 and 11.04.
Rev. 3 Patch ID for 11.04 corrected.
------------------------------------------------------------------
A. Background
A buffer overflow has been reported in dtspcd. It may be
possible to exploit this overflow to gain unauthorized access.

B. Fixing the problem
Patches available for HP-UX releases 10.10, 10.20, 10.24,
11.00, 11.04, and 11.11.

C. Recommended solution
Install the appropriate patch for 10.10, 10.20, 10.24, 11.00,
11.04, and 11.11.

Note: Some of the patches have dependencies on other patches.
This is documented in the patch text.
All patches are now available. The ftp site which had
temporary fix files will be deleted.

D. To subscribe to automatically receive future NEW HP Security
Bulletins from the HP IT Resource Center via electronic
mail, do the following:

Use your browser to get to the HP IT Resource Center page
at:

``_<http://itrc.hp.com>_

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In the left most frame select "Maintenance and Support".

Under the "Notifications" section (near the bottom of
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To -subscribe- to future HP Security Bulletins or other
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or

To -review- bulletins already released, select the link
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To -gain access- to the Security Patch Matrix, select
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For information on the Security Patch Check tool, see:
``_<http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/>_
displayProductInfo.pl?productNumber=B6834AA"

The security patch matrix is also available via anonymous
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ftp.itrc.hp.com:~ftp/export/patches/hp-ux_patch_matrix

On the "Support Information Digest Main" page:
click on the "HP Security Bulletin Archive".

E. To report new security vulnerabilities, send email to

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Please encrypt any exploit information using the
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Permission is granted for copying and circulating this
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Any other use of this information is prohibited. HP is not
liable for any misuse of this information by any third party.
________________________________________________________________

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

IBM __ Affected

Notified: October 29, 2001 Updated: August 11, 2003

Status

Affected

Vendor Statement

The emergency fix is no longer available since an official APAR is available. The APAR numbers are:

AIX 4.3: IY25436
AIX 5.1: IY25437
These APARs can be downloaded from:

<http://techsupport.services.ibm.com/s2g/fixdb.html>
and

<https://techsupport.services.ibm.com/server/aix.fdc>
respectively.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

SGI __ Affected

Notified: October 29, 2001 Updated: April 03, 2002

Status

Affected

Vendor Statement

SGI has released SGI Security Advisory 20011107-01-P and SGI Security Advisory 20020302-01-A.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Sun Microsystems Inc. __ Affected

Notified: October 29, 2001 Updated: January 10, 2002

Status

Affected

Vendor Statement

-----BEGIN PGP SIGNED MESSAGE-----

________________________________________________________________________________
Sun Microsystems, Inc. Security Bulletin

Bulletin Number: #00214
Date: January 8, 2002
Cross-Ref: CERT Advisory CA-2001-31
Title: dtspcd
________________________________________________________________________________

The information contained in this Security Bulletin is provided "AS IS."
Sun makes no warranties of any kind whatsoever with respect to the information
contained in this Security Bulletin. ALL EXPRESS OR IMPLIED CONDITIONS,
REPRESENTATIONS AND WARRANTIES, INCLUDING ANY WARRANTY OF NON-INFRINGEMENT OR
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE
HEREBY DISCLAIMED AND EXCLUDED TO THE EXTENT ALLOWED BY APPLICABLE LAW.

IN NO EVENT WILL SUN MICROSYSTEMS, INC. BE LIABLE FOR ANY LOST REVENUE,
PROFIT OR DATA, OR FOR DIRECT, SPECIAL, INDIRECT, CONSEQUENTIAL, INCIDENTAL
OR PUNITIVE DAMAGES HOWEVER CAUSED AND REGARDLESS OF ANY THEORY OF LIABILITY
ARISING OUT OF THE USE OF OR INABILITY TO USE THE INFORMATION CONTAINED IN
THIS SECURITY BULLETIN, EVEN IF SUN MICROSYSTEMS, INC. HAS BEEN ADVISED OF
THE POSSIBILITY OF SUCH DAMAGES.

If any of the above provisions are held to be in violation of applicable law,
void, or unenforceable in any jurisdiction, then such provisions are waived
to the extent necessary for this disclaimer to be otherwise enforceable in
such jurisdiction.
________________________________________________________________________________

1. Bulletins Topics

Sun announces the release of patches for Solaris(tm) 8, 7, 2.6,
and 2.5.1 (SunOS(tm) 5.8, 5.7, 5.6, and 5.5.1) which relate to a
buffer overflow in dtspcd.

Sun recommends that you install the patches listed in section 4
immediately on systems running the CDE Subprocess control service,
dtspcd, on SunOS 5.8, 5.7, 5.6, and 5.5.1.

2. Who is Affected

Vulnerable:SunOS 5.8, 5.8_x86, 5.7, 5.7_x86, 5.6,
5.6_x86, 5.5.1, and 5.5.1_x86

3. Understanding the Vulnerability

The CDE Subprocess Control Service (dtspcd) daemon accepts requests
from CDE clients to execute commands and launch applications on the
local system running the dtspcd daemon. The dtspcd daemon is spawned
by the inetd daemon (see inetd(1M)) in response to a CDE client
request. dtspcd is normally configured to run on port 6112/tcp with
root privileges.

A buffer overflow has been discovered in dtspcd which may be
exploited by a local or a remote attacker to gain root access on the
affected system. Any system that does not run the CDE Subprocess
Control service, dtspcd, is not vulnerable to this problem. This
issue was discovered by ISS X-Force who published an advisory at:

&lt;http://xforce.iss.net/alerts/advise101.php&gt;

CERT Advisory CA-2001-31 is available from:

&lt;http://www.cert.org/advisories/CA-2001-31.html&gt;

4. List of Patches

The following patches are available in relation to the above issue.

OS Version Patch ID
__________ _________
SunOS 5.8 108949-07
SunOS 5.8_x86 108950-07
SunOS 5.7 106934-04
SunOS 5.7_x86 106935-04
SunOS 5.6 105669-11
SunOS 5.6_x86 105670-10
SunOS 5.5.1 108363-02
SunOS 5.5.1_x86 108364-02
_______________________________________________________________________________

APPENDICES

A. Patches listed in this bulletin are available to all Sun customers at:

&lt;http://sunsolve.sun.com/securitypatch&gt;

B. Checksums for the patches listed in this bulletin are available at:

&lt;ftp://sunsolve.sun.com/pub/patches/CHECKSUMS&gt;

C. Sun security bulletins are available at:

&lt;http://sunsolve.sun.com/security&gt;

D. Sun Security Coordination Team's PGP key is available at:

&lt;http://sunsolve.sun.com/pgpkey.txt&gt;

E. To report or inquire about a security problem with Sun software, contact
one or more of the following:

- Your local Sun answer centers
- Your representative computer security response team, such as CERT
- Sun Security Coordination Team. Send email to:

security-alert@sun.com

F. To receive information or subscribe to our CWS (Customer Warning System)
mailing list, send email to:

security-alert@sun.com

with a subject line (not body) containing one of the following commands:

Command Information Returned/Action Taken
_______ _________________________________

help An explanation of how to get information

key Sun Security Coordination Team's PGP key

list A list of current security topics

query [topic] The email is treated as an inquiry and is forwarded to
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report [topic] The email is treated as a security report and is
forwarded to the Security Coordination Team. Please
encrypt sensitive mail using Sun Security Coordination
Team's PGP key

send topic A short status summary or bulletin. For example, to
retrieve a Security Bulletin #00138, supply the
following in the subject line (not body):

send #138

subscribe Sender is added to our mailing list. To subscribe,
supply the following in the subject line (not body):

subscribe cws your-email-address

Note that your-email-address should be substituted
by your email address.

unsubscribe Sender is removed from the CWS mailing list.
________________________________________________________________________________

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Sun,
Sun Microsystems, Solaris and SunOS are trademarks or registered trademarks
of Sun Microsystems, Inc. in the United States and other countries. This
Security Bulletin may be reproduced and distributed, provided that this
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Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

The Open Group __ Affected

Notified: October 29, 2001 Updated: November 12, 2001

Status

Affected

Vendor Statement

The Open Group is investigating this issue. Source licensees of The Open Group's CDE product can contact desktop@opengroup.org for advice regarding this issue.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

The SCO Group (SCO UnixWare) __ Affected

Notified: October 29, 2001 Updated: September 13, 2002

Status

Affected

Vendor Statement

Caldera has released Security Advisory CSSA-2001-SCO.30.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Xi Graphics __ Affected

Notified: October 29, 2001 Updated: November 15, 2001

Status

Affected

Vendor Statement

Xi Graphics DeXtop 2.1 is vulnerable. Further information and a patch are available at the following locations:

&lt;ftp://ftp.xig.com/updates/dextop/2.1/DEX2100.012.txt&gt;

<ftp://ftp.xig.com/updates/dextop/2.1/DEX2100.012.tar.gz>

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Cray Inc. __ Not Affected

Notified: October 29, 2001 Updated: October 31, 2001

Status

Not Affected

Vendor Statement

Cray, Inc. is not affected by VU#172583 since CDE is not included in UNICOS or UNICOS/mk. CrayTools does not contain CDE.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Fujitsu __ Not Affected

Notified: October 29, 2001 Updated: October 31, 2001

Status

Not Affected

Vendor Statement

Fujitsu's UXP/V operating system is not vulnerable because it does not support any CDE components.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Data General Unknown

Notified: October 29, 2001 Updated: October 31, 2001

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

TriTeal __ Unknown

Updated: November 12, 2001

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

TriTeal went bankrupt in December 1999. It is possible that TriTeal Enterprise Desktop (TED) and CDE distributions based on TriTeal code are vulnerable.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

View all 12 vendors View less vendors

CVSS Metrics

Group | Score | Vector
---|---|---
Base | |
Temporal | |
Environmental | |

References

  • <http://www.cert.org/advisories/CA-2001-31.html>
  • <http://xforce.iss.net/alerts/advise101.php>
  • <http://www.securityfocus.com/bid/3517>

Acknowledgements

This vulnerability was reported to the CERT Coordination Center by Internet Security Systems (ISS) X-Force.

This document was written by Art Manion.

Other Information

CVE IDs: | CVE-2001-0803
---|---
CERT Advisory: | CA-2001-31
Severity Metric: | 16.30
Date Public: | 2001-11-07
Date First Published: | 2001-11-12
Date Last Updated: | 2003-08-11 19:00 UTC
Document Revision: | 45