-----BEGIN PGP SIGNED MESSAGE----- ============================================================================= CERT(sm) Advisory CA-96.01 Original issue date: February 8, 1996 Last revised: February 14, 1997 - Introduction - updated the IP spoofing reference to CA-96.21. Updates section - added pointers to CISCO documents. A complete revision history is at the end of this advisory. Topic: UDP Port Denial-of-Service Attack - ----------------------------------------------------------------------------- The CERT Coordination Center has received reports of programs that launch denial-of-service attacks by creating a "UDP packet storm" either on a system or between two systems. An attack on one host causes that host to perform poorly. An attack between two hosts can cause extreme network congestion in addition to adversely affecting host performance. The CERT staff recommends disabling unneeded UDP services on each host, in particular the chargen and echo services, and filtering these services at the firewall or Internet gateway. Because the UDP port denial-of-service attacks typically involve IP spoofing, we encourage you to follow the recommendations in advisory CA-96.21. We will update this advisory as we receive additional information. Please check advisory files regularly for updates that relate to your site - ----------------------------------------------------------------------------- I. Description When a connection is established between two UDP services, each of which produces output, these two services can produce a very high number of packets that can lead to a denial of service on the machine(s) where the services are offered. Anyone with network connectivity can launch an attack; no account access is needed. For example, by connecting a host's chargen service to the echo service on the same or another machine, all affected machines may be effectively taken out of service because of the excessively high number of packets produced. In addition, if two or more hosts are so connected, the intervening network may also become congested and deny service to all hosts whose traffic traverses that network. II. Impact Anyone with network connectivity can cause a denial of service. This attack does not enable them to gain additional access. III. Solution We recommend taking all the steps described below. 1. Disable and filter chargen and echo services. This attack is most readily exploited using the chargen or echo services, neither of which is generally needed as far as we are aware. We recommend that you disable both services on the host and filter them at the firewall or Internet gateway. To disable these services on a host, it is necessary to edit the inetd configuration file and cause inetd to begin using the new configuration. Exactly how to do this is system dependent so you should check your vendor's documentation for inetd(8); but on many UNIX systems the steps will be as follows: (1) Edit the inetd configuration file (e.g. /etc/inetd.conf). (2) Comment out the echo, chargen, and other UDP services not used. (3) Cause the inetd process to reread the configuration file (e.g., by sending it a HUP signal). 2. Disable and filter other unused UDP services. To protect against similar attacks against other services, we recommend - disabling all unused UDP services on hosts and - blocking at firewalls all UDP ports less than 900 with the exception of specific services you require, such as DNS (port 53). 3. If you must provide external access to some UDP services, consider using a proxy mechanism to protect that service from misuse. Techniques to do this are discussed in Chapter 8, "Configuring Internet Services," in _Building Internet Firewalls_ by Chapman and Zwicky (see Section IV below). 4. Monitor your network. If you do provide external UDP services, we recommend monitoring your network to learn which systems are using these services and to monitor for signs of misuse. Tools for doing so include Argus, tcpdump, and netlog. Argus is available from ftp://ftp.net.cmu.edu/pub/argus-1.5/ MD5 (argus-1.5.tar.gz) = 9c7052fb1742f9f6232a890267c03f3c Note that Argus requires the TCP wrappers to install: ftp://info.cert.org/pub/tools/tcp_wrappers/tcp_wrappers_7.2.tar.Z MD5 (tcp_wrappers_7.2.tar.Z) = 883d00cbd2dedd9bfc783b7065740e74 tcpdump is available from ftp://ftp.ee.lbl.gov/tcpdump-3.0.2.tar.Z MD5 (tcpdump-3.0.2.tar.Z) = c757608d5823aa68e4061ebd4753e591 Note that tcpdump requires libpcap, available at ftp://ftp.ee.lbl.gov/libpcap-0.0.6.tar.Z MD5 (libpcap-0.0.6.tar.Z) = cda0980f786932a7e2eebfb2641aa7a0 netlog is available from ftp://net.tamu.edu/pub/security/TAMU/netlog-1.2.tar.gz MD5 (netlog-1.2.tar.gz) = 1dd62e7e96192456e8c75047c38e994b 5. Take steps against IP spoofing. Because IP spoofing is typically involved in UDP port denial-of-service attacks, we encourage you to follow the guidance in advisory CA-95:01, available from ftp://info.cert.org/pub/cert_advisories/CA-95:01.IP.spoofing IV. Sources of further information about packet filtering For a general packet-filtering recommendations, see ftp://info.cert.org/pub/tech_tips/packet_filtering For in-depth discussions of how to configure your firewall, see _Firewalls and Internet Security: Repelling the Wily Hacker_ William R. Cheswick and Steven M. Bellovin Addison-Wesley Publishing Company, 1994 ISBN 0-201-63357 _Building Internet Firewalls_ Brent Chapman and Elizabeth D. Zwicky O'Reilly & Associates, Inc., 1995 ISBN 1-56592-124-0 - --------------------------------------------------------------------------- The CERT Coordination Center staff thanks Peter D. Skopp of Columbia University for reporting the vulnerability and Steve Bellovin of AT&T Bell Labs for his support in responding to this problem. - --------------------------------------------------------------------------- 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 (FIRST). We strongly urge you to encrypt any sensitive information you send by email. The CERT Coordination Center can support a shared DES key and PGP. Contact the CERT staff for more information. Location of CERT PGP key ftp://info.cert.org/pub/CERT_PGP.key CERT 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 To be added to our mailing list for CERT advisories and bulletins, send your email address to cert-advisory-request@cert.org CERT publications, information about FIRST representatives, and other security-related information are available for anonymous FTP from ftp://info.cert.org/pub/ CERT advisories and bulletins are also posted on the USENET newsgroup comp.security.announce Copyright 1997 Carnegie Mellon University This material may be reproduced and distributed without permission provided it is used for noncommercial purposes and the copyright statement is included. CERT is a service mark of Carnegie Mellon University. ============================================================================= UPDATES CISCO - ----- Cisco Alert Summary: http://www.cisco.com/warp/public/146/917_security.html Cisco Security Guide http://www.cisco.com/univercd/data/doc/cintrnet/ics/icssecur.htm Silicon Graphics Inc. - --------------------- SGI acknowledges CERT Advisory CA-96.01 and is currently investigating. No further information is available at this time. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Revision history Feb. 14, 1997 Introduction - updated the IP spoofing reference to CA-96.21. Updates section - added pointers to CISCO documents. Aug. 30, 1996 Information previously in the README was inserted into the advisory. Feb. 23, 1996 Updates section - added information from Silicon Graphics, Inc. Feb. 21, 1996 Solution, Sec. III.4 - added new URL for Argus. -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBMwTKXnVP+x0t4w7BAQEYVAP/fLxjusXIKs5FQ24u9hW9OS6B0ThgibBo lqTdErwTHUhUXc5R3rveE0aEiSn4NhBiEK4hNUY2jpmvw9A24aoE5w5gH+4C/uoY yb0aFqYDoef3amgcOhGmsMoOwgcWB9cesLom8Cih/UlRI6CeCwodpqDhQwd+SOGk JFbZnh0xgrE= =kXm1 -----END PGP SIGNATURE-----