Hacker (computer security) (794228), страница 2

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Main article: Exploit (computer security)

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

Main article: 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

Main article: 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)

Main article: Spoofing attack

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

Main article: 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

Main article: Social engineering (computer security)

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's natural instinct to help someone with a problem. The hacker will not get angry and instead act very distressed and concerned. The help desk is the most vulnerable to this type of social engineering, because it generally has 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 is also a great way to get information. 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

Main article: Trojan horse (computing)

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 the 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

Main article: Keystroke logging

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 use 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

Main article: List of convicted computer criminals

Notable security hackers

Main article: List of hackers

• Jacob Appelbaum is an Advocate, Security Researcher, and Developer for the Tor project. He speaks internationally for usage of Tor by human rights groups and others concerned about internet anonymity and censorship.

• Albert Gonzalez sentenced to 20 years in prison.

• Eric Corley (also known as Emmanuel Goldstein) is the long standing publisher of 2600: The Hacker Quarterly. He is also the founder of the H.O.P.E. conferences. He has been part of the hacker community since the late '70s.

• Ed Cummings (also known as Bernie S) is the long standing writer for 2600: The Hacker Quarterly. He set legal precedence after denial of both a bail hearing and a speedy trial in 1995. Bernie S was charged with possession of technology which could be used for fraudulent purposes.

• Dan Kaminsky is a DNS expert who exposed multiple flaws in the protocol and investigated Sony's rootkit security issues in 2005. He has spoken in front of the US Senate on technology issues.

• Gordon Lyon, known by the handle Fyodor, authored the Nmap Security Scanner as well as many network security books and web sites. He is a founding member of the Honeynet Project and Vice President of Computer Professionals for Social Responsibility.

• Gary McKinnon is a Scottish hacker facing extradition to the United States to face charges of perpetrating what has been described as a travesty of justice with many in the UK "show a little bit of compassion" to rule sooner who also suffers from Asperger syndrome.^[18]

• Kevin Mitnick is a computer security consultant and author, formerly the most wanted computer criminal in United States history.^[19]

• Rafael Núñez aka RaFa was a notorious most wanted hacker by the FBI since 2001.

• Meredith L. Patterson a well known technologist and biohacker who has presented research with Dan Kamisky and Len Sassaman at many international security and hacker conferences.

• Len Sassaman a Belgian computer programmer and technologist who was also a privacy advocate.

• Solar Designer is the pseudonym of the founder of the Openwall Project.

• Michał Zalewski (lcamtuf) is a prominent security researcher.

Customs

The computer underground^[1] 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.^[20] It is common among hackers to use aliases for the purpose of concealing identity, rather than revealing their real names.

Hacker groups and conventions

Main articles: Hacker conference and Hacker group

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 provided a platform for information sharing via dialup. Hackers could also gain credibility by being affiliated with an elite group.^[21]

Hacking and the law

Netherlands

• Article 138ab of Wetboek van Strafrecht prohibits computervredebreuk which is defined as intruding an automated work or a part thereof with intention and against the law. Intrusion is defined as access by means of:

  • breaking through a security;

  • by technical means;

  • by false signals or a false key;

  • by disguising, which is using a stolen username and password.

Maximum imprisonment is one year or a fine of the fourth category.^[22][23]

Hacking and the media

Hacker magazines

Характеристики

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