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S-98-01.asc
Posted Jan 10, 2000

Subject "smurf" IP Denial-of-Service Attacks Date 9-Jan-98

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S-98-01.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 to CERT-NL information contained in this advisory are therefore outdated.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 : Niels den Otter Index : S-98-01
Distribution : World Page : 1
Classification: External Version: 1
Subject : "smurf" IP Denial-of-Service Attacks Date : 9-Jan-98
===============================================================================

By courtesy of CERT Coordination Center we received information on
denial-of-service attacks involving forged ICMP echo request packets
(commonly known as "ping" packets) sent to IP broadcast addresses.

These attacks can result in large amounts of ICMP echo reply packets being
sent from an intermediary site to a victim, which can cause network
congestion or outages.

CERT-NL urges you to disable IP-directed broadcasts at your routers that are
connected to large LANs and to configure your operating systems to prevent
the machine from responding to ICMP packets sent to IP broadcast addresses.

All CERT Coordination Center advisories are mirrored by CERT-NL.
The specific URL for this case is:

<ftp://ftp.surfnet.nl/surfnet/net-security/cert-cc-mirror/cert_advisories/
CA-98.01.smurf>


ADVISORIES ARE REGULARLY UPDATED BY CERT COORDINATION CENTER.
Therefore we advise you to check on our mirror regularly -
you can automate this process using the CERT-NL notifier service.

More information about the CERT-NL mirror and notifier services is
contained in News items N-95-01 (notifier) and N-95-02 (CERT mirror),
both present on
<ftp://ftp.surfnet.nl/surfnet/net-security/cert-nl/docs/news/>

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