Network Working Group J. Reynolds
Request for Comments: 1135 ISI
December 1989
The Helminthiasis of the Internet
Status of this Memo
This memo takes a look back at the helminthiasis (infestation with,
or disease caused by parasitic worms) of the Internet that was
unleashed the evening of 2 November 1988. This RFCprovides
information about an event that occurred in the life of the Internet.
This memo does not specify any standard. Distribution of this memo
is unlimited.
IntrodUCtion
----- "The obscure we see eventually, the completely
apparent takes longer." ----- Edward R. Murrow
The helminthiasis of the Internet was a self-replicating program that
infected VAX computers and SUN-3 workstations running the 4.2 and 4.3
Berkeley UNIX code. It disrupted the operations of computers by
Accessing known security loopholes in applications closely associated
with the operating system. Despite system administrators efforts to
eliminate the program, the infection continued to attack and spread
to other sites across the United States.
This RFCprovides a glimpse at the infection, its festering, and
cure. The impact of the worm on the Internet community, ethics
statements, the role of the news media, crime in the computer world,
and future prevention will be discussed. A documentation review
presents four publications that describe in detail this particular
parasitic computer program. Reference and bibliography sections are
also included in this memo.
1. The Infection
----- "Sandworms, ya hate 'em, right??" ----- Michael
Keaton, Beetlejuice
Defining "worm" versus "virus"
A "worm" is a program that can run independently, will consume the
resources of its host from within in order to maintain itself, and
can propagate a complete working version of itself on to other
machines.
A "virus" is a piece of code that inserts itself into a host,
including operating systems, to propagate. It cannot run
independently. It requires that its host program be run to
activate it.
In the early stages of the helminthiasis, the news media popularly
cited the Internet worm to be a "virus", which was attributed to
an early conclusion of some in the computer community before a
specimen of the worm could be extracted and dissected. There are
some computer scientists that still argue over what to call the
affliction. In this RFC, we use the term, "worm".
1.1 Infection - The Worm Attacks
The worm specifically and only made successful attacks on SUN
workstations and VAXes running Berkeley UNIX code.
The Internet worm relied on the several known access loopholes in
order to propagate over networks. It relied on implementation
errors in two network programs: sendmail and fingerd.
Sendmail is a program that implements the Internet's electronic
mail services (routing and delivery) interacting with remote sites
[1, 2]. The feature in sendmail that was violated was a non-
standard "debug" command. The worm propagated itself via the
debug command into remote hosts. As the worm installed itself in
a new host the new instance began self-replicating.
Fingerd is a utility program that is intended to help remote
Internet users by supplying public information about other
Internet users. This can be in the form of identification of the
full name of, or login name of any local user, whether or not they
are logged in at the time (see the Finger Protocol [3]).
Using fingerd, the worm initiated a memory overflow situation by
sending too many characters for fingerd to accommodate (in the
gets library routine). Upon overflowing the storage space, the
worm was able to execute a small arbitrary program. Only 4.3BSD
VAX machines suffered from this attack.
Another of the worm's methods was to eXPloit the "trusted host
features" often used in local networks to propagate (using rexec
and rsh).
It also infected machines in /etc/hosts.equiv, machines in
/.rhosts, machines in cracked accounts' .forward files, machines
cracked accounts' .rhosts files, machines listed as network
gateways in routing tables, machines at the far end of point-to-
point interfaces, and other machines at randomly guessed addresses
on networks of first hop gateways.
The Internet worm was also able to infect systems using guessed
passWords, typically spreading itself within local networks by
this method. It tried to guess passwords, and upon gaining
access, the worm was able to pose as a legitimate user.
1.2 Festering - Password Cracking
The worm festered by going into a password cracking phase,
attempting to access accounts with obvious passwords (using clues
readily available in the /etc/passwd file), such as: none at all,
the user name, the user name appended to itself, the "nickname",
the last name, the last name spelled backwards. It also tried
breaking into into accounts with passwords from a personalized 432
word dictionary, and accounts with passwords in /usr/dict/words.
Most users encountered a slowing of their programs, as the systems
became overloaded trying to run many copies of the worm program,
or a lack of file space if many copies of the worm's temporary
files existed concurrently. Actually, the worm was very careful
to hide itself and leave little evidence of its passage through a
system. The users at the infected sites may have seen strange
files that showed up in the /usr/tmp Directories of some machines
and obscure messages appeared in the log files of sendmail.
1.3 The Cure
Teams of computer science students and staff worked feverishly to
understand the worm. The key was seen to get a source (C
language) version of the program. Since the only isolated
instances of the the worm were binary code, a major effort was
made to translate back to source, that is decompile the code, and
to study just what damage the worm was capable of. Two specific
teams emerged in the battle against the Internet worm: the
Berkeley Team and the MIT team. They communicated and exchanged
code extensively. Both teams were able to scrutinize it and take
immediate action on a cure and prevent reinfection. Just like
regular medical Doctors, the teams searched, found and isolated a
worm specimen which they could study. Upon analyzing the specimen
and the elements of its design, they set about to develop methods
to treat and defeat it. Through the use of the "old boy network"
of UNIX system wizards (to find out something, one asks an
associate or friend if they know the answer or who else they could
refer to to find out the answer), email and phone calls were
extensively used to alert the computer world of the program
patches that could be used at sites to close the sendmail hole and
fingerd holes. Once the information was disseminated to the sites
and these holes were patched, the Internet worm was stopped. It
could not reinfect the same computers again, unless the worm was
still sitting in an infected trusted host computer.
The Internet worm was eliminated from most computers within 48-72
hours after it had appeared, specifically through the efforts of
computer science staffs at the University research centers.
Government and Commercial agencies apparently were slow in coming
around to recognizing the helminthiasis and eradicating it.
2. Impact
----- "Off with his head!!!" ----- The Red Queen,
Alice in Wonderland
Two lines have been drawn in the computer community in the aftermath
of the Internet worm of November 1988. One group contends that the
release of the worm program was a naive accident, and that the worm
"escaped" during testing. Yet, when the worm program was unleashed,
it was obvious it was spreading unchecked. Another group argues that
the worm was deliberately released to blatantly point out security
defects to a community that was aware of the problems, but were
complacent about fixing them. Yet, one does not necessarily need to
deliberately disrupt the entire world in order to report a problem.
Both groups agree that the community cannot condone worm infestation
whether "experimental" or "deliberate" as a means to heighten public
awareness, as the consequences of such irresponsible acts can be
devastating. Meanwhile, several in the news media stated that the
author of the worm did the computer community a favor by exposing the
security flaws, and that bugs and security flaws will not get fixed
without such drastic measures as the Internet worm program.
In the short term, the worm program did heighten the computer
community's awareness of security flaws. Also, the "old boy network"
proved it was still alive and well! While networking and computers
as a whole have grown by leaps and bounds in the last twenty years,
the Internet community still has the "old boys" who trust and
communicate well with each other in the face of adversity.
In the long term, all results of the helminthiasis are not complete.
Many sites have either placed restrictions on access to their
machines, and a few have chosen to remove themselves from the
Internet entirely. The legal consequences of the Internet worm
program as a computer crime are still pending, and may stay in that
condition into the next decade.
Yet, the problem of computer crime is, on a layman's level, a social
one. Legal statutes, which notoriously are legislated after the
fact, are only one element of the solution. Development of
enforceable ethical standards that are universally agreed on in the
computer community, coupled with enforceable laws should help
eradicate computer crime.
3. Ethics and the Internet
----- "If you're going to play the game properly,
you'd better know every rule." ----- Barbara Jordan
Ethical behavior is that of conforming to accepted professional
standards of conduct; dealing with what is good or bad within a set
of moral principles or values. Up until recently, most computer
professionals and groups have not been overly concerned with
questions of ethics.
Organizations and computer professional groups have recently, in the
aftermath of the Internet worm, issued their own "Statement of
Ethics". Ethics statements published by the Internet Activities
Board (IAB), the National Science Foundation (NSF), the Massachusetts
Institute of Technology (MIT), and the Computer Professionals for
Social Responsibility (CPSR) are discussed below.
3.1 The IAB
The IAB issued a statement of policy concerning the proper use of
the resources of the Internet in January, 1989 [4] (and reprinted
in the Communications of the ACM, June 1989). An excerpt:
The Internet is a national facility whose utility is largely a
consequence of its wide availability and accessibility.
Irresponsible use of this critical resource poses an enormous
threat to its continued availability to the technical community.
The U.S. Government sponsors of this system have a fiduciary
responsibility to the public to allocate government resources
wisely and effectively. Justification for the support of this
system suffers when highly disruptive abuses occur. Access to and
use of the Internet is a privilege and should be treated as such
by all users of this system.
The IAB strongly endorses the view of the Division Advisory Panel
of the National Science Foundation Division of Network,
Communications Research and Infrastructure which, in paraphrase,
characterized as unethical and unacceptable any activity which
purposely:
(a) seeks to gain unauthorized access to the resources of the
Internet,
(b) disrupts the intended use of the Internet,
(c) wastes resources (people, capacity, computer) through such
actions,
(d) destroys the integrity of computer-based information, and/or
(e) compromises the privacy of users.
The Internet exists in the general research milieu. Portions of
it continue to be used to support research and experimentation on
networking. Because experimentation on the Internet has the
potential to affect all of its components and users, researchers
have the responsibility to exercise great caution in the conduct
of their work. Negligence in the conduct of Internet-wide
experiments is both irresponsible and unacceptable.
The IAB plans to take whatever actions it can, in concert with
Federal agencies and other interested parties, to identify and to
set up technical and procedural mechanisms to make the Internet
more resistant to disruption. Such security, however, may be
extremely expensive and may be counterproductive if it inhibits
the free flow of information which makes the Internet so valuable.
In the final analysis, the health and well-being of the Internet
is the responsibility of its users who must, uniformly, guard
against abuses which disrupt the system and threaten its long-term
viability.
3.2 NSF
The NSF issued an ethical network use statement on 30 November
1988, during the regular meeting of the Division Advisory Panel
for Networking and Communications Research and Infrastructure (and
reprinted in the Communications of the ACM (June of 1989) [5]),
that stated, in part:
The Division Advisory Panel (DAP) of the NSF Division of
Networking and Communication Research and Infrastructure (DNCRI)
deplores lapses of ethical behavior which cause disruption to our
national network resources. Industry, government, and academe
have established computer networks in support of research and
scholarship. Recent events have accentuated the importance of
establishing community standards for the ethical use of networks.
In this regard, the DNCRI DAP defines as unethical any activity
which purposefully or through negligence:
a. disrupts the intended use of the networks,
b. wastes resources through such actions (people, bandwidth or
computer),
c. destroys the integrity of computer-based information,
d. compromises the privacy of users,
e. consumes unplanned resources for control and eradication.
We encourage organizations managing and operating networks to
adopt and publicize policies and standards for ethical behavior.
We also encourage these organizations to adopt administrative
procedures to enforce appropriate disciplinary responses to
violations and to work with appropriate bodies on drafting
legislation in this area.
3.3 MIT
MIT issued a statement of ethics entitled, "Teaching Students
About Responsible Use of Computers" in 1985-1986 (and reprinted in
the Communications of the ACM (June 1989) [6]). The official
statement of ethics specifically outlined MIT's position on the
intended use, privacy and security, system integrity, and
intellectual property rights.
Those standards, outlined in the MIT Bulletin under academic
procedures, call for all members of the community to act in a
responsible, ethical, and professional way. The members of the
MIT community also carry the responsibility to use the system in
accordance with MIT's standards of honesty and personal conduct.
3.4 CPSR
The CPSR issued a statement on the Computer Virus in November 1988
(and reprinted in the Communications of the ACM (June 1989) [7]).
The CPSR believes:
The incident should prompt critical review of our dependence on
complex computer networks, particularly for military and defense-
related function. The flaws that permitted the recent virus to
spread will eventually be fixed, but other flaws will remain.
Security loopholes are inevitable in any computer network and are
prevalent in those that support general-purpose computing and are
widely accessible.
An effective way to correct known security flaws is to publish
descriptions of the flaws so that they can be corrected. We
therefore view the effort to conceal technical descriptions of the
recent virus as short-sighted.
CPSR believes that innovation, creativity, and the open exchange
of ideas are the ingredients of scientific advancement and
technological achievement. Computer networks, such as the
Internet, facilitate this exchange. We cannot afford policies
that might restrict the ability of computer researchers to
exchange their ideas with one another. More secure networks, such
as military and financial networks, sharply restrict access and
offer limited functionality. Government, industry, and the
university community should support the continued development of
network technology that provides open access to many users.
The computer virus has sent a clear warning to the computing
community and to society at large. We hope it will provoke a long
overdue public discussion about the vulnerabilities of computer
networks, and the technological, ethical, and legal choices we
must address.
4. The Role of the Media
----- "You don't worry about whether or not they've
written it, you worry whether or not they've read it
before they go on the air." ----- Linda Ellerbee,
the Pat Sajak Show.
Airplane accidents, Pit Bulldog attacks, drought, disease...the media
is there...whether you want them there or not. Predictably, some
members of the press grabbed on to the worm invasion of the Internet
and sensationalized the outbreak. Sites were named (including sites
like NASA Ames and Lawrence Livermore) and pointed to as being
"violated". Questions of computer security were rampant. Questions
of national security appropriately followed. The alleged perpetrator
of the worm tended to be thought of by the press as a "genius" or a
"hero".
During the helminthiasis of the Internet, handling this news media
"invasion", was critical. It's akin to trying to extinguish a major
brush fire with a news reporter and a microphone in your way. Time
is of the essence. The U.C. Berkeley group, among others, reported
that it was a problem to get work accomplished with the press
hounding them incessantly. At MIT, their news Office was commended
in doing their job of keeping the press informed and satisfied, yet
out of the way of the students and staff working on the a cure.
What is an appropriate response?? At MIT, even a carefully worded
"technical" statement to the press resulted in very few coherent
press releases on the Internet worm. Extrapolation and "flavoring"
by the press were common. According to Eichin and Rochlis, "We were
unable to show the T.V. crew anything "visual" caused by the virus,
something which eventually become a common media request and
disappointment. Instead, they settled for people looking at
workstations talking 'computer talk'." [10]
Cornell University was very critical of the press in their report to
the Provost: "The Commission suggests that media exaggeration of the
value and technical sophistication of this kind of activity obscures
the far more accomplished work of those students who complete their
graduate studies without public fanfare; who make constructive
contributions to computer sciences and the advancement of knowledge
through their patiently constructed dissertation; and who subject
their work to the close scrutiny and evaluation of their peers, and
not to the interpretations of the popular press." [9]
5. Crime in the Computer World
----- "A recent survey by the American Bar Association
found that almost one-half of those companies and
Government agencies that responded had been victimized
by some form of computer crime. The known financial loss
from those crimes was estimated as high as $730 million,
and the report concluded that computer crime is among
the worst white-collar offenses." ----- The Computer
Fraud and Abuse Act of 1986
The term White Collar crime was first used by Edwin Sutherland, a
noted American criminologist, in 1939. Sutherland contended that the
popular view of crime as primarily a lower class (Blue Collar)
activity was based on the failure to consider the activities of the
robber barons and captains of industry who violated the law with
virtual impunity.
In this day and age, White Collar crime refers to violations of the
law committed by salaried or professional persons in conjunction with
their work. Computer crimes are identified and included in this
classification. Yet, law enforcement agencies have historically paid
little attention to this new phenomenon. When a trial and conviction
does occur, it's resulted more often in a fine and probation, than a
prison term. A shift became apparent in the late 1970s, when the
FBI's ABSCAM investigation (1978-80) resulted in the conviction of
several U.S. legislators for bribery and related charges.
The legal implication of the Internet worm program as a computer
crime is still pending, as there are few cases to rely on. On the
Federal level, HR-6061, "The Computer Virus Eradication Act of 1988"
(Herger & Carr) was introduced in the U.S. House of Representatives.
On the State level, several states are considering their own
statutes. Time will tell.
Meanwhile, computer network security is still allegedly being
compromised, as described in a recent DDN Security Bulletin [12].
6. Future Prevention
----- "This is a pretty kettle of fish." ----- Queen Mary to
Stanley Baldwin at the time of Edward VII's abdication
What roles can the computer community as a whole, play in preventing
such outbreaks? Why were many people aware of the debug problem in
the sendmail program and the overflow problem in fingerd, yet,
appropriate fixes were not installed in existing systems?
Various opinions have emerged:
1) Computer ethics must be taken seriously. A standard for
computer ethics is extremely important for the new groups of
computer professionals graduating out of Universities. The
"old" professionals and "new" professionals who use
computers are ALL responsible for their applications.
2) The "powers that be" of the Internet (IAB, DARPA, NSF, etc.)
should pursue the current problems in network security, and
cause the flaws to be fixed.
3) The openness and free flow of information of networking
should be rightfully preserved, as it demonstrated its worth
during the helminthiasis by expediting the analysis and cure
of the infestation.
4) Promote and coordinate the establishment of committees or
agency "police" panels that would handle, judge, and enforce
violations based on a universally set standard of computer
ethics.
5) The continued incidences of "computer crime" show a lack of
professionalism and ethical standards in the computer
community. Ethics statements like those discussed in this
RFC, not only need to be published, but enforced as well.
There is a continuing need to instill a professional code of
ethics and responsibilities in order to preserve the
computer community.
7. Documentation Review
----- "Everybody wants to get into the act!" ----- Jimmy
Durante.
Quite a number of articles and papers were published very soon after
the worm invasion. Books, articles, and other documents are
continuing to be written and published on the subject (see Section 9,
Bibliography). In this RFC, we have chosen four to review: The
Cornell University Report on "The Computer Worm" [8], presented to
the Provost of the University, Eichin and Rochlis' "With Microscope
and Tweezers: An Analysis of the Internet Virus of November 1988"
[9], Donn Seeley's "A Tour of the Worm" [10], and Gene Spafford's,
"The Internet Worm Program: An Analysis" [11].
7.1 The Cornell University Report
The Cornell University Report on "The Computer Worm", was
presented to the Provost of the University on 6 February 1989, by
the Commission of Preliminary Enquiry, consisting of: Ted
Eisenberg, Law, David Gries, Computer Science, Juris Hartmanis,
Computer Science, Don Holcomb, Physics, M. Stuart Lynn, Office of
Information Technologies (Chair), and Thomas Santoro, Office of
the University Counsel.
An introduction set the stage of the intent and purpose of the
Commission:
1) Accumulate all evidence concerning the involvement
of the alleged Cornell University Computer Science
graduate student in the worm infestation of the Internet,
and to assess the gathered evidence to determine the
alleged graduate student was the perpetrator.
2) Accumulate all evidence concerning the potential
involvement of any other members of the Cornell University
community, and to assess such evidence to determine
whether or not any other members of the Cornell University
community was involved in unleashing the worm on to the
Internet, or knew of the potential worm infestation ahead
of time.
3) Evaluate relevant computer policies and procedures to
determine which, if any, were violated and to make
preliminary recommendations to the Provost as to
whether any of such policies and procedures should be
modified to inhibit potential future security violations
of this general type.
In the summary of findings and comments, the Commission named the
Cornell University first year Computer Science graduate student
that allegedly created the worm and unleashed it on to the
Internet. The findings section also discussed:
1) the impact of the invasion of the worm,
2) the mitigation attempts to stop the worm,
3) the violation of computer abuse policies,
4) the intent,
5) security attitudes and knowledge,
6) technical sophistication,
7) Cornell's involvement,
8) ethical considerations,
9) community sentiment,
10) and Cornell University's policies on computer abuse.
The report concluded that the worm program's gathering of
unauthorized passwords and the dissemination of the worm over a
national network were wrong. The Commission also disclaimed that
contrary to media reports, Cornell University DID NOT condone the
worm infection, nor heralded the unleashing of the worm program as
a heroic event. The Commission did continue to encourage the free
flow of scholarly research and reasonable trust within the
University/Research communities.
A background on the worm program, methods of investigation, an
introduction to the evidence, an interpretation and findings,
acknowledgements, and an extensive appendices were also included
in the Commission's report.
7.2 "With Microscope and Tweezers: An Analysis of the Internet
Virus of November 1988"
Eichin and Rochlis' "With Microscope and Tweezers: An Analysis of
the Internet Virus of November 1988", provides a detailed
dissection of the worm program. The paper discusses the major
points of the worm program then reviews strategies, chronology,
lessons and open issues, acknowledgements; also included are a
detailed appendix on the worm program subroutine by subroutine, an
appendix on the cast of characters, and a reference section.
A discussion of the terms "worm" versus "virus" is presented.
These authors concluded that it was a "virus" infection, not worm
infection. Thus they use the term "virus" in their document. In
Section 1, goals and targets by the teams of computer scientists
were defined. There were three steps taken to find out the inner
workings of the virus:
- isolating a specimen of the virus in a form
which could be analyzed.
- "decompiling" the virus, into a form that could
be shown to reduce to the executable of the real
things, so that the higher level version could be
interpreted.
- analyzing the strategies used by the virus, and
the elements of its design, in order to find weaknesses
and methods of defeating it.
Major points were outlined of how the virus attacked and who it
attacked:
How it entered.
Who it attacked.
What it attacked.
What it did NOT do.
In Section 2, the target of the attacks by the virus were
discussed. This included the sendmail debug mode, the finger
daemon bug, rexec and passwords, rsh, trusted host features, and
information flow. A description of the virus' self protection
included how it covered its tracks, and what camouflage it used to
go undetected to the machines and system administrators. Flaws
were analyzed in three subjects: reinfection prevention,
heuristics, and vulnerabilities not used.
Many defenses were launched to stop the virus. Some were
convenient or inconvenient for end users of the infected systems.
Those mentioned in this document included:
- full isolation from the network
- turning off mail service
- patching out the "debug" command in sendmail
- shutting down the finger daemon
- fixing the finger daemon
- mkdir /usr/tmp/sh (a simple way to keep the virus
from propagating)
- defining pleasequit (did not stop the virus)
- renaming the UNIX C compiler and linker
- requiring new passwords for all users
After the virus was diagnosed, a tool was created which duplicated
the password attack (including the virus' internal directory) and
was posted to the Internet. System administrators were able to
analyze the passwords in use on their system.
Section 3 chronicles the events that took place between Wednesday,
2 November 1988 through Friday, 11 November 1988 (EST). In
Section 4, lessons and open issues are viewed and discussed:
- Connectivity was important.
- The "old boy network" worked.
- Late night authentication is an interesting problem.
(How did you know that it really is MIT on the
phone??)
- Whom do you call (if you need to talk to the manager of
the Ohio State University network at 3 o'clock in the
morning)?
- Speaker phones and conference calling proved very useful.
- The "teams" that were formed and how they reacted to
the virus is a topic for future study.
- Misinformation and illusions ran rampant.
- Tools were not as important as one would have
anticipated.
- Source availability was important.
- The academic sites performed the best, better than
government and commercial sites.
- Managing the press was critical.
General points for the future:
- "We have met the enemy and he is us."
(Alleged author of the virus was an insider.)
- Diversity is good.
- "The cure shouldn't be worse than the disease."
(It may be more expensive to prevent such attacks
than is is to clean up after them.)
- Defenses must be at the host level, not the network level.
(The network performed its function perfectly and should
not be faulted; the flaws were in several application
programs.)
- Logging information is important.
- Denial of service attacks are easy.
- A central security fix repository may be a good idea.
- Knee-jerk reactions should be avoided.
Appendix A describes the virus program subroutine by subroutine.
A flow of information among the subroutines is pictured on page
19. Appendix B presents the 432 words built in the worm's
dictionary. Appendix C lists the "cast of characters" in
defeating the virus.
7.3 "A Tour of the Worm"
In Donn Seeley's "A Tour of the Worm", specific details were
presented as a "walk thru" of this particular worm program. The
paper opened with an abstract, introduction, detailed chronology
of events upon the discovery of the worm, an overview, the
internals of the worm, personal opinions, and conclusion.
The chronology section presented a partial list representing the
current known dates and times (in PST). In the descriptive
overview, the worm is defined as a 99-line bootstrap program
written in the C language, plus a large relocatable object file
that was available in VAX and various Sun-3 versions. Seeley
classified activities of the worm into two categories of attack
and defense. Attack consisted of locating hosts (and accounts) to
penetrate, then exploiting security holes on remote systems to
pass across a copy of the worm and run it. The defense tactics
fell into three categories: preventing the detection of intrusion,
inhibiting the analysis of the program, and authenticating other
worms. When analyzing this particular program, Seeley stated that
it is just as important to establish what the program DOES NOT do,
as what it does do:
This worm did not delete a system's files,
This worm did not modify existing files,
This worm did not install trojan horses,
This worm did not record or transmit decrypted passwords,
This worm did not try to capture superuser privileges,
This worm did not propagate over UUCP, X.25, DECNET, or BITNET,
This worm specifically draws upon TCP/IP,
and
This worm did not infect System V systems, unless they had been
modified to use Berkeley network programs like sendmail,
fingerd, and rexec.
In section 4, the "internals" of the worm were examined and
charted. The main thread of control in the worm was analyzed,
then an examination of the worm's data structure was presented.
Population growth of the worm, security holes, the worms' use of
rsh and rexec network services, the use of the TCP finger service
to gain entry to a system, and the sendmail attack are discussed.
Password cracking and faster password encryption algorithms are
discussed.
In the opinions section, certain questions that a "mythical
ordinary system administrator" might ask were discussed:
Did the worm cause damage?
Was the worm malicious?
Will publication or worm details further harm security?
7.4 "The Internet Worm Program: An Analysis"
Gene Spafford's "The Internet Worm Program: An Analysis",
described the infection of the Internet as a worm program that
exploited flaws in utility programs in UNIX based systems. His
report gives a detailed description of the components of the worm
program: data and functions. He focuses his study on two
completely independent reverse-compilations of the worm and a
version disassembled to VAX assembly language.
In Section 4, Spafford provided a high-level example of how the
worm program functioned. The worm consisted of two parts: a main
program, and a bootstrap (or vector) program. A description from
the point of view of a host that was infected was presented.
Section 5 describes the data structures and organization of the
routines of the program:
1) The worm had few global data structures.
2) The worm constructed a linked list of host
records.
3) The worm constructed a simple array of gateway
IP addresses through the use of the system
"netstat" command.
4) An array of records was filled in with information
about each network interface active on the current host.
5) A linked list of records was built to hold user
information.
6) The program maintained an array of "object" that
held the files that composed the worm.
7) A mini-dictionary of words was present in the worm
to use in password guessing.
8) Every text string used by the program, except for
the words in the mini-dictionary, was masked (XOR)
with the bit pattern 0x81.
9) The worm used the following routines:
setup and utility:
main, doit, crypt, h_addaddr,
h_addname, h_addr2host, h_clean,
h_name2host, if_init, loadobject,
makemagic, netmastfor, permute,
rt_init, supports_rsh, and supports_telnet
network and password attacks:
attack_network, attack_user, crack_0,
crack_1, crack_2, crack_3, cracksome,
ha, hg, hi, hl, hul, infect, scan_gateways,
sendWorm, try_fingerd, try_password,
try_rsh, try_sendmail, and waithit
Camouflage:
checkother, other_sleep, send_message,
and xorbuf
In Section 6, Spafford provides an analysis of the code of the worm.
He discusses the structure and style, the problems of functionality,
camouflage, specific comments, the sendmail attack, the machines
involved, and the portability considerations.
Finally, appendices supply the "mini-dictionary" of words contained
in the worm, the bootstrap (vector) program that the worm traversed
over to each machine, a corrected fingerd program, and the patches
developed and invoked to sendmail to rectify the infection.
8. References
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10. Security Considerations
If security considerations had not been so widely ignored in the
Internet, this memo would not have been possible.
Author's Address
Joyce K. Reynolds
University of Southern California
Information Sciences Institute
4676 Admiralty Way
Marina del Rey, CA 90292
Phone: (213) 822-1511
EMail: JKREY@ISI.EDU
