January 1993
Revision 7
JPO#93-025 and ESC#93-0115
The CERT Coordination Center FAQ
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= Preface Section: =
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This document is intended to answer the most Frequently Asked
Questions (FAQs) about the CERT Coordination Center. The FAQ is a
dynamic document that will change as information changes. Suggestions
for additional sections are welcome -- please e-mail them to
cert@cert.org. The most recent copy of this FAQ will be available
via anonymous FTP from cert.org (192.88.209.5) in the /pub directory.
Questions answered in this document
A. Introduction to the CERT Coordination Center
A1. What is CERT?
A2. What does CERT stand for?
B. Where to go for information
B1. What is a CERT advisory?
B2. Where can I obtain archived CERT advisories?
B3. Can I obtain source code to a patch described in a CERT
advisory?
B4. What security mailing lists, newsgroups, and other sources
of information does CERT recommend?
B5. What information is available via anonymous FTP from
CERT?
B6. What presentations, workshops, and seminars does the CERT
Coordination Center offer?
B7. What books or articles does the CERT Coordination Center
recommend?
C. Incident Response
C1. What kind of information should I provide to CERT when my
site has experienced an intrusion?
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= Section A. Introduction to the CERT Coordination Center =
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A1. What is CERT?
CERT is the Computer Emergency Response Team that was formed
by the Defense Advanced Research Projects Agency (DARPA) in
November 1988 in response to the needs exhibited during the
Internet worm incident. The CERT charter is to work with the
Internet community to facilitate its response to computer
security events involving Internet hosts, to take proactive
steps to raise the community's awareness of computer security
issues, and to conduct research targeted at improving the
security of existing systems.
CERT products and services include 24-hour technical
assistance for responding to computer security incidents,
product vulnerability assistance, technical documents, and
seminars. In addition, the team maintains a number of
mailing lists (including one for CERT advisories) and
provides an anonymous FTP server: cert.org (192.88.209.5),
where security-related documents, past CERT advisories, and
tools are archived.
CERT contact information:
U.S. mail address
CERT Coordination Center
Software Engineering Institute
Carnegie Mellon University
Pittsburgh, PA 15213-3890
U.S.A.
Internet E-mail address
cert@cert.org
Telephone number
+1 412-268-7090 (24-hour hotline)
CERT Coordination Center personnel answer
7:30 a.m.- 6:00 p.m. EST(GMT-5)/EDT(GMT-4), on call for
emergencies during other hours.
FAX number
+1 412-268-6989
A2. What does CERT stand for?
You may see our name in several different forms. CERT stood
for "Computer Emergency Response Team", CERT/CC stood for
"CERT Coordination Center", and now we use "CERT Coordination
Center". Informally, we use "CERT", throughout this document
and a few other documents.
We use the e-mail address:
cert@cert.org
Any references to:
cert@cert.sei.cmu.edu
or
cert@sei.cmu.edu
should be changed to the new address (cert@cert.org).
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= Section B. Where to go for information =
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B1. What is a CERT advisory?
A CERT advisory provides information on how to obtain a patch or
details of a workaround for a known computer security problem.
CERT works with vendors to produce a workaround or a patch
for a problem, and does not publish vulnerability information
until a workaround or a patch is available. A CERT advisory
may also be a warning to our constituency about ongoing
attacks (e.g., "CA-91:18.Active.Internet.tftp.Attacks").
CERT advisories are published on the USENET newsgroup:
comp.security.announce
and are distributed via the cert-advisory mailing list. Both
of these publication methods are described below.
CERT advisory archives are available via anonymous FTP from
cert.org (192.88.209.5) in the /pub/cert_advisories
directory.
B2. Where can I obtain archived CERT advisories?
CERT advisories are available via anonymous FTP from cert.org
(192.88.209.5) in the /pub/cert_advisories directory. The
"01-README" file provides a short summary of each of the
advisories.
B3. Can I get source code to a patch described in a CERT advisory?
CERT does not provide source-level patches. Some vendors make
source-level patches available to their source customers
while others only distribute binary patches. Contact your
vendor for more information.
B4. What security mailing lists, newsgroups, and other sources of
information does CERT recommend?
(a) CERT mailing lists
(1) CERT advisory mailing list
The CERT Coordination Center maintains a CERT
advisory mailing list for those members of the
constituency who are unable to access USENET news
or who would like to have advisories mailed
directly to them or to a mail exploder at their
site. If you would like to be added to the
mailing list, please send mail to:
cert-advisory-request@cert.org
You will receive confirmation mail when you have
been placed on the list.
(2) CERT tools mailing list
The purpose of this moderated mailing list is to
encourage the exchange of information on security
tools and techniques. The list should not be used
for security problem reports.
The CERT Coordination Center will not formally
review, evaluate, or endorse the tools and
techniques described. The decision to use the
tools and techniques described is the
responsibility of each user or organization, and
we encourage each organization to thoroughly
evaluate new tools and techniques before
installation or use.
Membership is restricted to system programmers,
system administrators, and others with a
legitimate interest in the development of computer
security tools. If you would like to be
considered for inclusion, please send mail to:
cert-tools-request@cert.org
You will receive confirmation mail when you have
been placed on the list.
(b) Other security-related mailing lists
(1) VIRUS-L mailing list (see comp.virus newsgroup
below)
VIRUS-L is a moderated mailing list with a focus
on computer virus issues. For more information,
including a copy of the posting guidelines, see
the file "virus-l.README", available via anonymous
FTP on cert.org (192.33.209.5) in the /pub/virus-l
directory. To be added to the mailing list, send
mail to:
listserv@lehigh.edu
In the body of the message, put nothing more than:
SUB VIRUS-L your name
(2) VALERT-L mailing list
VALERT-L is a mailing list for sharing urgent
virus warnings among other computer users. Note
that any message sent to VALERT-L will be
cross-posted in the next VIRUS-l digest. To be
added to the mailing list, send mail to:
listserv@lehigh.edu
In the body of the message, put nothing more than:
SUB VALERT-L your name
(c) USENET newsgroups
(1) comp.security.announce
The comp.security.announce newsgroup is moderated
and is used solely for the distribution of CERT
advisories.
(2) comp.security.misc
The comp.security.misc is a forum for the
discussion of computer security, especially as it
relates to the UNIX(r) Operating System.
(3) alt.security
The alt.security newsgroup is also a forum for the
discussion of computer security, as well as other
issues such as car locks and alarm systems.
(4) comp.virus
The comp.virus newsgroup is a moderated newsgroup
with a focus on computer virus issues. For more
information, including a copy of the posting
guidelines, see the file "virus-l.README",
available via anonymous FTP on cert.org
(192.88.209.5) in the /pub/virus-l directory.
(5) comp.risks
The comp.risks newsgroup is a moderated forum on
the risks to the public in computers and related
systems.
(d) NIST (National Institute of Standards and Technology)
Computer Security Bulletin Board
Information posted on the bboard includes an events
calendar, software reviews, publications, bibliographies,
lists of organizations, and other government bulletin
board numbers. This bboard contains no sensitive
(unclassified or classified) information.
If you have any questions, contact NIST by phone at:
301-975-3359; by FAX at: 301-590-0932; or by e-mail at:
csrc@csrc.ncsl.nist.gov.
B5. What information is available via anonymous FTP from CERT?
CERT provides information available via anonymous FTP from
cert.org (192.88.209.5) in the /pub directory. In the
/pub directory, the file "ls-lR" lists the subdirectories
and the information found in those subdirectories.
/pub/CERT_Press_Release_8812: The file
"CERT_Press_Release_8812" is a copy of the December 1988 DARPA
press release announcing the formation of the CERT
Coordination Center.
/pub/FIRST: The /pub/FIRST directory contains a file,
"first-contacts". FIRST, the Forum of Incident Response and
Security Teams, is an organization whose members work together
voluntarily to deal with computer security problems and their
prevention. General information on FIRST is available via
anonymous FTP from csrc.ncsl.nist.gov in the /pub/first
directory. The name of the file is "op_frame.txt". The
document begins with a description of the CERT System, which
was later renamed "FIRST". Also in that directory are the
minutes from meetings, a list of FIRST contacts (also
duplicated in the CERT anonymous FTP area on cert.org
[192.88.209.5] in the /pub/FIRST directory), and other related
information.
/pub/cert_advisories: The /pub/cert_advisories directory
contains archived copies of past CERT advisories, the
"01-README" file, a copy of the CERT press release from
December 1988 announcing the formation of CERT, an article
from the March 1990 issue of Bridge, a magazine published by
the Software Engineering Institute (SEI), describing CERT, and
a file containing information on the status of the rdist
patch.
/pub/clippings: The /pub/clippings directory is an archive
service for computer security. This archive is a central
repository for selected security related USENET News and
mailing list postings. The archive will not be restricted to
any one newsgroup or mailing list. To submit an article for
the clippings archive, please send e-mail to:
clip@cert.org
/pub/cops: The /pub/cops directory includes the information
for the COPS package. COPS is a publicly available collection
of programs that attempts to identify security problems in the
UNIX Operating System. COPS does not attempt to correct
any discrepancies found; it simply produces a report of its
findings.
/pub/info: The /pub/info directory contains online copies of
security-related books and papers, including Dave Curry's May
1990 SRI Tech Report "Improving the Security of Your Unix
System", "Computer Emergency Response - An International
Problem" by Richard D. Pethia and Kenneth R. van Wyk, the
report "Coping with the Threat of Computer Security Incidents:
A Primer from Prevention through Recovery" by Russell Brand,
and the Department of Defense Trusted Computer System
Evaluation Criteria CSC-STD-001-83 often referred to as the
"Orange Book". (Note: This is the Aug 1983 version of this
document; this document was revised in Dec 1985.)
/pub/network_tools The /pub/network_tools directory contains
network tools made available via anonymous FTP. The file
"tcp_wrapper.xx" is a TCP daemon wrapper program that will
provide additional logging information and access control for
many network services (also duplicated in the /pub/tools
directory).
/pub/papers: The /pub/papers directory contains the
announcement of the CERT tools mailing list.
/pub/ssphwg: The /pub/ssphwg directory contains archived
information from the IETF Site Security Policy Handbook
Working Group and the IETF Security Policy Working Group. RFC
1244, "Site Security Handbook" was the result of the Site
Security Policy Handbook Working Group; and RFC 1281,
"Guidelines for the Secure Operation of the Internet" was the
result of the Security Policy Working Group. Both of these
RFCs are available in the /pub/info directory, as mentioned
above.
/pub/tech_tips: The /pub/tech_tips directory contains
documents on anonymous FTP configurations, packet filtering,
and the CERT security checklist.
/pub/tools: The /pub/tools directory contains various
software programs, including COPS, Crack, TCP daemon wrappers,
and virus-detection programs.
/pub/virus-l: The /pub/virus-l directory contains the
archives and other VIRUS-L and VALERT-L mailing list
documents.
B6. What presentations, workshops, and seminars does the CERT
Coordination Center offer?
(a) Presentations
Throughout the year, members of the CERT Coordination
Center give presentations at various technical
conferences, seminars, and regional networks.
Periodically, special arrangements can be made to tailor
the presentation to fit the requirements of the specific
site. For further information regarding presentations,
please contact the CERT Coordination Center.
(b) Workshops
For the past few years, the CERT Coordination Center has
hosted and co-sponsored the FIRST Workshop on Incident
Handling. The 1993 workshop will be held in St. Louis,
Missouri, August 10-13, 1993. For further information,
please contact the CERT Coordination Center.
(c) Seminars
(1) Internet Security for Managers
Description: This seminar is to help
managers understand what needs to be done to ensure
that their computer systems and networks are as
securely managed as possible when operating within
the Internet community. Attendees will be provided
with information that will enable them to formulate
realistic security policies, procedures, and
programs specific to their operating environment.
Audience: This seminar is designed for managers of
computing centers/facilities, individuals tasked to
evaluate/initiate Internet connectivity, senior system
administrators, and others interested in computer
security within the Internet community.
(2) Internet Security for UNIX System Administrators
Description: The information presented in this
seminar is based on incidents reported to the CERT
Coordination Center. The topics covered will include
defensive and offensive strategies for system
administration, site-specific security policies, and
incident handling.
Audience: This seminar is designed for users and
system administrators of hosts using the UNIX
Operating System. It is especially suited for system
administrators of systems connected to a wide
area network based on TCP/IP such as the Internet.
Some system administrator experience is assumed.
B7. What books or articles does the CERT Coordination Center
recommend?
[Bishop 87] Bishop, Matt. "How to Write a Setuid
Program." ;login: 12(1) (Jan/Feb 1987):
5-12.
[Curry 90] Curry, Dave. "Improving the Security of Your
UNIX System" (Technical Report
ITSTD-721-FR-90-21). Menlo Park, CA: SRI
International, April 1990.
[Curry 92] Curry, David A. UNIX System Security: A
Guide for Users and System Administrators.
Addison-Wesley Publishing Co., Inc.
(ISBN 0-201-56327-4), 1992.
[Denning 91] Denning, Peter J., ed. Computers Under
Attack: Intruders, Worms, and Viruses. ACM
Press, Addison-Wesley Publishing Company,
Inc. (ISBN 0-201-53067-8), 1990.
[Farrow 91] Farrow, Rik. How to Protect Your Data and
Prevent Intruders: UNIX System Security.
Addison-Wesley Publishing Company, Inc.
(ISBN 0-201-57030-0), 1991.
[Garfinkel and Spafford 91]
Garfinkel, Simson; Spafford, Gene. Practical
UNIX Security. O'Reilly & Associates, Inc.
(ISBN 0-937175-72-2), 1991.
[Grampo and Morris 84]
Grampo, M.; Morris, R.T. "UNIX Operating
System Security." AT&T Technical Journal
63(8) (Oct 1984): 1649-1672.
[Hafner and Markoff 91]
Hafner, Katie; Markoff, John. Cyperpunk:
Outlaws and Hackers on the Computer Frontier.
Simon & Schuster, 1991.
[Morris and Thompson 79]
Morris, R.T.; Thompson, K. "Password
Security: A Case History." CACM 22(11)
(November 1979): 594-597.
[Nemeth, Snyder, and Seebass 89]
Nemeth, Evi; Snyder, Garth; Seebass, Scott.
UNIX System Administration Handbook. Prentice
Hall (ISBN 0-13-933441-6), 1989.
[Stoll 89] Stoll, Clifford. The Cuckoo's Egg: Tracking a
Spy Through the Maze of Computer Espionage.
Doubleday (ISBN 0-385-24946-2), 1989.
[Wood and Kochran 86]
Wood, Patrick; Kochran, Stephen. UNIX System
Security. Haden Books, 1986.
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= Section C. Incident Response =
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C1. What kind of information should I provide to CERT when my site
has had an intrusion?
The CERT Coordination Center would like as much information as
possible, including opinions and thoughts as to how the
breakin occurred. Some specifics include:
1) names of host(s) compromised at your site
2) architecture and OS (operating system and revision)
of compromised host(s)
3) whether or not security patches have been applied
to the compromised host(s); if so, were patches
applied before or after the intrusion
4) account name(s) compromised
5) other host(s)/site(s) involved in the intrusion and
whether or not you have already contacted those
site(s) about the intrusion
6) if other site(s) have been contacted, the contact
information used for contacting the site(s)
involved
7) if CERT is to contact the other site(s), can we
give the other sites your contact information
(i.e., your name, e-mail address, and phone number)
8) whether or not any law enforcement agencies have
been contacted
9) appropriate log extracts (including timestamps)
10) what assistance you would like from the CERT
Coordination Center
UNIX(r) is a registered trademark of UNIX System Laboratories, Inc.
CERT is sponsored by the Advanced Research Projects Agency (ARPA). The
Software Engineering Institute is sponsored by the U.S. Department of
Defense.