Hacker (computer security)
From Wikipedia, the free encyclopedia
Hacker means someone who finds weaknesses in a computer or computer network, though the term can also refer to someone with an advanced understanding of computers and computer networks.
[1] Hackers may be motivated by a multitude of reasons, such as profit, protest, or challenge.
[2] The subculture that has evolved around hackers is often referred to as the computer underground but it is now an open
community.
[3] While other uses of the word hacker exist that are not related to computer security, they are rarely used in mainstream context. They are subject to the long standing
hacker definition controversy about the true meaning of the term
hacker. In this controversy, the term hacker is reclaimed by
computer programmers who argue that someone breaking into computers is better called a
cracker,
[4] not making a difference between computer criminals (
black hats) and computer security experts (
white hats). Some white hat hackers claim that they also deserve the title hacker, and that only black hats should be called crackers.
History
Bruce Sterling traces part of the roots of the computer underground to the
Yippies, a 1960s counterculture movement which published the
Technological Assistance Program (TAP) newsletter.
[citation needed] TAP was a
phone phreaking newsletter that taught the techniques necessary for the unauthorized exploration of the phone network. Many people from the phreaking community are also active in the hacking community even today, and vice versa.
[citation needed] Classifications
Several subgroups of the computer underground with different attitudes use different terms to demarcate themselves from each other, or try to exclude some specific group with which they do not agree.
Eric S. Raymond (author of
The New Hacker's Dictionary) advocates that members of the computer underground should be called crackers. Yet, those people see themselves as hackers and even try to include the views of Raymond in what they see as one wider hacker culture, a view harshly rejected by Raymond himself. Instead of a hacker/cracker dichotomy, they give more emphasis to a spectrum of different categories, such as
white hat,
grey hat,
black hat and
script kiddie. In contrast to Raymond, they usually reserve the term cracker for more malicious activity. According to (Clifford R.D. 2006) a cracker or cracking is to "gain unauthorized access to a computer in order to commit another crime such as destroying information contained in that system".
[5] These subgroups may also be defined by the legal status of their activities.
[6]
White hat
A
white hat hacker breaks security for non-malicious reasons, perhaps to test their own security system or while working for a security company which makes security software. The term "white hat" in Internet slang refers to an
ethical hacker. This classification also includes individuals who perform
penetration tests and
vulnerability assessments within a contractual agreement. The
EC-Council, also known as the International Council of Electronic Commerce Consultants has developed certifications, courseware, classes, and online training covering the diverse arena of Ethical Hacking.
[6] Black hat
A "black hat" hacker is a hacker who "violates computer security for little reason beyond maliciousness or for personal gain" (Moore, 2005).
[7] Black hat hackers form the stereotypical, illegal hacking groups often portrayed in popular culture, and are "the epitome of all that the public fears in a computer criminal".
[8] Black hat hackers break into secure networks to destroy data or make the network unusable for those who are authorized to use the network. They choose their targets using a two-pronged process known as the "pre-hacking stage".
- Part 1: Targeting
- The hacker determines what network to break into during this phase. The target may be of particular interest to the hacker, either politically or personally, or it may be picked at random. Next, they will port scan a network to determine if it is vulnerable to attacks, which is just testing all ports on a host machine for a response. Open ports—those that do respond—will allow a hacker to access the system.
- Part 2: Research and Information Gathering
- It is in this stage that the hacker will visit or contact the target in some way in hopes of finding out vital information that will help them access the system. The main way that hackers get desired results from this stage is from "social engineering", which will be explained below. Aside from social engineering, hackers can also use a technique called "dumpster diving". Dumpster diving is when a hacker will literally search through users' garbage in hopes of finding documents that have been thrown away, which may contain information a hacker can use directly or indirectly, to help them gain access to a network.
- Part 3: Finishing The Attack
- This is the stage when the hacker will invade the preliminary target that he/she was planning to attack or steal. Many "hackers" will be caught after this point, lured in or grabbed by any data also known as a honeypot (a trap set up by computer security personnel).
Grey hat
A grey hat hacker is a combination of a Black Hat and a White Hat Hacker. A Grey Hat Hacker may surf the internet and hack into a computer system for the sole purpose of notifying the administrator that their system has been hacked, for example. Then they may offer to repair their system for a small fee.
[8] Elite hacker
A
social status among hackers,
elite is used to describe the most skilled. Newly discovered
exploits will circulate among these hackers. Elite
groups such as
Masters of Deception conferred a kind of credibility on their members.
[9] Script kiddie
A
script kiddie (or skiddie) is a non-expert who breaks into computer systems by using pre-packaged automated tools written by others, usually with little understanding of the underlying concept—hence the term script (i.e. a prearranged plan or set of activities) kiddie (i.e. kid, child—an individual lacking knowledge and experience, immature).
[10] Neophyte
A neophyte, "
n00b", or "
newbie" is someone who is new to hacking or phreaking and has almost no knowledge or experience of the workings of technology, and hacking.
[8] Blue hat
A
blue hat hacker is someone outside computer security consulting firms who is used to bug test a system prior to its launch, looking for exploits so they can be closed.
Microsoft also uses the term
BlueHat to represent a series of security briefing events.
[11][12][13] Hacktivist
A hacktivist is a hacker who utilizes technology to announce a social, ideological, religious, or political message. In general, most
hacktivism involves website defacement or
denial-of-service attacks.
Nation state
Intelligence agencies and cyberwarfare operatives of nation states.
[14] Organized criminal gangs
Criminal activity carried on for profit.
[14] Bots
Automated software tools, some freeware, available for the use of any type of hacker.
[14] Attacks
A typical approach in an attack on Internet-connected system is:
- Network enumeration: Discovering information about the intended target.
- Vulnerability analysis: Identifying potential ways of attack.
- Exploitation: Attempting to compromise the system by employing the vulnerabilities found through the vulnerability analysis.[15]
In order to do so, there are several recurring tools of the trade and techniques used by computer criminals and security experts.
Security exploits
A security exploit is a prepared application that takes advantage of a known weakness. Common examples of security exploits are
SQL injection,
Cross Site Scripting and
Cross Site Request Forgery which abuse security holes that may result from substandard programming practice. Other exploits would be able to be used through
FTP,
HTTP,
PHP,
SSH,
Telnet and some web-pages. These are very common in website/domain hacking.
Techniques
- Vulnerability scanner
- A vulnerability scanner is a tool used to quickly check computers on a network for known weaknesses. Hackers also commonly use port scanners. These check to see which ports on a specified computer are "open" or available to access the computer, and sometimes will detect what program or service is listening on that port, and its version number. (Note that firewalls defend computers from intruders by limiting access to ports/machines both inbound and outbound, but can still be circumvented.)
- Password cracking
- Password cracking is the process of recovering passwords from data that has been stored in or transmitted by a computer system. A common approach is to repeatedly try guesses for the password.
- Packet sniffer
Main article:
Packet sniffer- A packet sniffer is an application that captures data packets, which can be used to capture passwords and other data in transit over the network.
- Spoofing attack (Phishing)
- A spoofing attack involves one program, system, or website successfully masquerading as another by falsifying data and thereby being treated as a trusted system by a user or another program. The purpose of this is usually to fool programs, systems, or users into revealing confidential information, such as user names and passwords, to the attacker.
- Rootkit
- A rootkit is designed to conceal the compromise of a computer's security, and can represent any of a set of programs which work to subvert control of an operating system from its legitimate operators. Usually, a rootkit will obscure its installation and attempt to prevent its removal through a subversion of standard system security. Rootkits may include replacements for system binaries so that it becomes impossible for the legitimate user to detect the presence of the intruder on the system by looking at process tables.
- Social engineering
When a Hacker, typically a black hat, is in the second stage of the targeting process, he or she will typically use some social engineering tactics to get enough information to access the network. A common practice for hackers who use this technique, is to contact the system administrator and play the role of a user who cannot get access to his or her system. Hackers who use this technique have to be quite savvy and choose the words they use carefully, in order to trick the system administrator into giving them information. In some cases only an employed help desk user will answer the phone and they are generally easy to trick. Another typical hacker approach is for the hacker to act like a very angry supervisor and when the his/her authority is questioned they will threaten the help desk user with their job. Social Engineering is very effective because users are the most vulnerable part of an organization. All the security devices and programs in the world won't keep an organization safe if an employee gives away a password. Black Hat Hackers take advantage of this fact. Social Engineering can also be broken down into four sub-groups. These are intimidation, helpfulness, technical, and name-dropping.
- Intimidation As stated above, with the angry supervisor, the hacker attacks the person who answers the phone with threats to their job. Many people at this point will accept that the hacker is a supervisor and give them the needed information.
- Helpfulness Opposite to intimidation, helpfulness is taking advantage of a person natural instinct to help someone with a problem. The hacker will not get angry instead act very distressed and concerned. The help desk is the most vulnerable to this type of Social Engineering, because they generally have the authority to change or reset passwords which is exactly what the hacker needs.
- Name-Dropping Simply put, the hacker uses the names of advanced users as "key words", and gets the person who answers the phone to believe that they are part of the company because of this. Some information, like web page ownership, can be obtained easily on the web. Other information such as president and vice president names might have to be obtained via dumpster diving.
- Technical Using technology to get information is also a great way to get it. A hacker can send a fax or an email to a legitimate user in hopes to get a response containing vital information. Many times the hacker will act like he/she is involved with law enforcement and needs certain data for record keeping purposes or investigations.
- Trojan horses
- A Trojan horse is a program which seems to be doing one thing, but is actually doing another. A trojan horse can be used to set up a back door in a computer system such that the intruder can gain access later. (The name refers to the horse from the Trojan War, with conceptually similar function of deceiving defenders into bringing an intruder inside.)
- Viruses
Main article:
Computer virus- A virus is a self-replicating program that spreads by inserting copies of itself into other executable code or documents. Therefore, a computer virus behaves in a way similar to a biological virus, which spreads by inserting itself into living cells.
- While some are harmless or mere hoaxes most computer viruses are considered malicious.
- Worms
Main article:
Computer worm- Like a virus, a worm is also a self-replicating program. A worm differs from a virus in that it propagates through computer networks without user intervention. Unlike a virus, it does not need to attach itself to an existing program. Many people conflate the terms "virus" and "worm", using them both to describe any self-propagating program.
- Key loggers
- A key logger is a tool designed to record ('log') every keystroke on an affected machine for later retrieval. Its purpose is usually to allow the user of this tool to gain access to confidential information typed on the affected machine, such as a user's password or other private data. Some key loggers uses virus-, trojan-, and rootkit-like methods to remain active and hidden. However, some key loggers are used in legitimate ways and sometimes to even enhance computer security. As an example, a business might have a key logger on a computer used at a point of sale and data collected by the key logger could be used for catching employee fraud.
Notable intruders and criminal hackers
Notable security hackers
Customs
The computer underground
[2] has produced its own slang and various forms of unusual alphabet use, for example
1337speak. Political attitude usually includes views for freedom of information, freedom of speech, a right for anonymity and most have a strong opposition against copyright.
[citation needed] Writing programs and performing other activities to support these views is referred to as
hacktivism. Some go as far as seeing illegal cracking ethically justified for this goal; a common form is
website defacement. The computer underground is frequently compared to the Wild West.
[18] It is common among hackers to use aliases for the purpose of concealing identity, rather than revealing their real names.
Hacker groups and conventions
The computer underground is supported by regular real-world gatherings called
hacker conventions or "hacker cons". These draw many people every year including
SummerCon (Summer),
DEF CON,
HoHoCon (Christmas), ShmooCon (February), BlackHat, AthCon, Hacker Halted, and
H.O.P.E..
[citation needed]. Local Hackfest groups organize and compete to develop skills to send a team to a prominent convention to compete in group pentesting, exploit and forensics on a wider scale. In the early 1980s Hacker Groups became popular, Hacker groups provided access to information and resources, and a place to learn from other members. BBS systems like Utopias
[19] provided a platform for information sharing via dialup. Hackers could also gain credibility by being affiliated with an elite group.
[20] Hacking and the media
Hacker magazines
The most notable hacker-oriented magazine publications are
Phrack,
Hakin9 and
2600: The Hacker Quarterly. While the information contained in hacker magazines and
ezines was often outdated, they improved the reputations of those who contributed by documenting their successes.
[20] Hackers in fiction
Hackers often show an interest in fictional
cyberpunk and
cyberculture literature and movies. Absorption of
fictional pseudonyms, symbols, values, and
metaphors from these fictional works is very common.
[citation needed]Books portraying hackers:
Films also portray hackers:
Non-fiction books
Fiction books
See also
source: wikipedia.com
, so hurry before they go down
).
? THIS UTILITY DOES THE JOB: 
, waiting for new ones...
