Date: 04 May 2000
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AUSCERT External Security Bulletin Redistribution
ESB-2000.084 -- CIAC Bulletin K-037
"mstream" Distributed Denial of Service Tool
04 May 2000
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AusCERT Security Bulletin Summary
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Product: mstream DDoS Tool
Vendor: N/A
Operating System: All TCP/IP based OS's
Unix
Platform: N/A
Impact: Distributed Denial of Service
Access Required: Remote
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__________________________________________________________
The U.S. Department of Energy
Computer Incident Advisory Capability
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__________________________________________________________
INFORMATION BULLETIN
"mstream" Distributed Denial of Service Tool
May 3, 2000 13:00 GMT Number K-037
______________________________________________________________________________
PROBLEM: A new Distributed Denial of Service tool named "mstream" has
been discovered.
PLATFORM: All systems that communicate using TCP can be attacked by this
tool. The tool runs on most UNIX systems.
DAMAGE: Attacked systems are slowed and network bandwidth is used up.
Attacking systems are also slowed.
SOLUTION: Follow the instructions below to discover and remove certain
versions of mstream. To detect mstream packets, watch the
packet stream for the ports and text as indicated in the
section "Detection of Mstream Packets" following the Internet
Security Systems advisory.
______________________________________________________________________________
VULNERABILITY The risk is MEDIUM. The mstream code has been made available in
ASSESSMENT: public forums, but good security practices can make it
difficult for an intruder to install the code on a
well-protected machine.
______________________________________________________________________________
http://www.ciac.org/ciac/bulletins/k-037.shtml
______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Internet Security Systems for
the information contained in this bulletin.
______________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.
CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
Voice: +1 925-422-8193
FAX: +1 925-423-8002
STU-III: +1 925-423-2604
E-mail: ciac@llnl.gov
For emergencies and off-hour assistance, DOE, DOE contractor sites,
and the NIH may contact CIAC 24-hours a day. During off hours (5PM -
8AM PST), use one of the following methods to contact CIAC:
1. Call the CIAC voice number 925-422-8193 and leave a message, or
2. Call 888-449-8369 to send a Sky Page to the CIAC duty person or
3. Send e-mail to 4498369@skytel.com, or
4. Call 800-201-9288 for the CIAC Project Leader.
Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.
World Wide Web: http://www.ciac.org/
(or http://ciac.llnl.gov -- they're the same machine)
Anonymous FTP: ftp.ciac.org
(or ciac.llnl.gov -- they're the same machine)
Modem access: +1 (925) 423-4753 (28.8K baud)
+1 (925) 423-3331 (28.8K baud)
PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins. If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
Incident Response and Security Teams (FIRST) is a world-wide
organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at http://www.first.org/.
This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
disclosed, or represents that its use would not infringe privately
owned rights. Reference herein to any specific commercial products,
process, or service by trade name, trademark, manufacturer, or
otherwise, does not necessarily constitute or imply its endorsement,
recommendation or favoring by the United States Government or the
University of California. The views and opinions of authors expressed
herein do not necessarily state or reflect those of the United States
Government or the University of California, and shall not be used for
advertising or product endorsement purposes.
LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC)
K-027: Microsoft SQL Server and MSDE Malicious Query Vulnerability
K-028: FreeBSD Port Exploits for mh/nmh, Lynx, and mtr
K-029: Microsoft "Registry Permissions" Vulnerability
K-030: SGI - Vulnerability in the objectserver daemon
K-031: Mobile Malicious Code
K-032: DDoS Mediation Action List
K-033: Microsoft "Myriad Escaped Characters" Vulnerability
K-034: Cisco Catalyst Enable Password Bypass Vulnerability
K-035: Backdoor Password in Red Hat Linux Virtual Server Package
K-036: Continuing Compromises of DNS Servers
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