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AUSCERT External Security Bulletin Redistribution
ESB-2000.005 -- Sun Security Bulletin #00193
Distributed Denial-of-Service Tools
06 January 2000
Sun Microsystems, Inc. has released the following bulletin concerning
distributed Denial-of-Service tools that are being used to attack Internet
sites and the vulnerabilities exploited to install the tools. These
attacks may cause machines to crash or become unstable.
The tools mentioned in this bulletin are the same as those in the CERT
advisory CA-2000-01, which was re-distributed as AusCERT ESB-2000.002.
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Sun Microsystems, Inc. Security Bulletin
Bulletin Number: #00193
Date: January 5, 2000
Cross-Ref: CERT Advisory CA-2000-01
Title: Distributed Denial-of-Service Tools
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
Several Sun Microsystems customers have expressed concern about
security issues raised in the recent "SANS Flash Alert For Solaris"
message posted to several security mailing lists in the last few
days. The issues cited in the posting have also been reported by
CERT, NIPC and other key organizations.
The issues raised in these advisories and postings are not new, and
no new vulnerabilities are involved. Also, no "virus"- or
"worm"-like software is involved. Further, there is no related "Y2K"
issue. (All of these possibilities have been proposed by concerned
Rather, the problems described in these advisories are caused by
software tools that are deliberately installed on machines which
have already been compromised. The tools may then be subsequently
used to launch denial-of-service attacks. The tools (known as
Trinoo, TFN, TFN2K, and Stacheldraht) are not capable of spreading
on their own, but do make use of already compromised hosts as
"client" machines to flood networks or targeted systems, causing
Sun and other organizations, such as CERT, believe that many of the
hosts used as attack "clients" have been compromised via
exploitation of known vulnerabilities such as:
o rpc.statd port bounce
o rpc.cmsd buffer overflows
o tooltalk buffer overflows
Sun patches are currently available for each of these
vulnerabilities. (For details, see "Recommendations" section below.)
Again: the new attack methods do not exploit new vulnerabilities.
The pertinent CERT advisory is at:
Sun recommends that you install all applicable security patches listed
in Sun security bulletins #00186 and #00188 to prevent exploitation of
the rpc.statd and rpc.cmsd vulnerabilities. Sun also recommends that
you keep your systems current on security patches and install all
applicable patches listed at:
A. Patches listed in this bulletin are available to all Sun customers at:
B. Checksums for the patches listed in this bulletin are available at:
C. Sun security bulletins are available at:
D. Sun Security Coordination Team's PGP key is available at:
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:
F. To receive information or subscribe to our CWS (Customer Warning System)
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Copyright 2000 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
Security Bulletin is not modified in any way and is attributed to
Sun Microsystems, Inc. and provided that such reproduction and distribution
is performed for non-commercial purposes.
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This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. 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 may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the original authors to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Internet Email: firstname.lastname@example.org
Facsimile: (07) 3365 7031
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.
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