Cyber-Security

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Did you know you can make a career out of that?  Cybersecurity Guru  Cybersecurity Forensic Expert  Information Security Expert  Ethical Hacker Cybersecurity professionals must have the same skills as the cyber attackers, but cybersecurity professionals must work within the bounds of the local, national and international law. Cybersecurity professionals must also use their skills ethically. What is Cybersecurity? The connected electronic information network has become an integral part of our daily lives. All types of organizations, such as medical, financial, and education institutions, use this network to operate effectively. They utilize the network by collecting, processing, storing, and sharing vast amounts of digital information. As more digital information is gathered and shared, the protection of this information is becoming even more vital to our national security and economic stability. Cybersecurity is the ongoing effort to protect these networked systems and all of the data from unauthorized use or harm. On a personal level, you need to safeguard your identity, your data, and your computing devices. At the corporate level, it is everyone’s responsibility to protect the organization’s reputation, data, and customers. At the state level, national security, and the safety and well-being of the citizens are at stake. Types of Organizational Data Traditional Data Corporate data includes personnel information, intellectual properties, and financial data. The personnel information includes application materials, payroll, offer letters, employee agreements, and any information used in making employment decisions. Intellectual property, such as patents, trademarks and new product plans, allows a business to gain economic advantage over its competitors. This intellectual property can be considered a trade secret; losing this information can be disastrous for the future of the company. The financial data, such as income statements, balance sheets, and cash flow statements of a company gives insight into the health of the company. Internet of Things and Big Data With the emergence of the Internet of Things (IoT), there is a lot more data to manage and secure. IoT is a large network of physical objects, such as sensors and equipment that extend beyond the traditional computer network. All these connections, plus the fact that we have expanded storage capacity and storage services through the Cloud and virtualization, lead to the exponential growth of data. This data has created a new area of interest in technology and business called “Big Data". With the velocity, volume, and variety of data generated by the IoT and the daily operations of business, the confidentiality, integrity and availability of this data is vital to the survival of the organization.

Confidentiality, Integrity, and Availability Confidentiality, integrity and availability, known as the CIA triad (Figure 1), is a guideline for information security for an organization. Confidentiality ensures the privacy of data by restricting access through authentication encryption. Integrity assures that the information is accurate and trustworthy. Availability ensures that the information is accessible to authorized people. Confidentiality Another term for confidentiality would be privacy. Company policies should restrict access to the information to authorized personnel and ensure that only those authorized individuals view this data. The data may be compartmentalized according to the security or sensitivity level of the information. For example, a Java program developer should not have to access to the personal information of all employees. Furthermore, employees should receive training to understand the best practices in safeguarding sensitive information to protect themselves and the company from attacks. Methods to ensure confidentiality include data encryption, username ID and password, two factor authentication, and minimizing exposure of sensitive information. Integrity Integrity is accuracy, consistency, and trustworthiness of the data during its entire life cycle. Data must be unaltered during transit and is not changed by unauthorized entities. File permissions and user access control can prevent unauthorized access. Version control can be used to prevent accidental changes by authorized users. Backups must be available to restore any corrupted data, and checksum hashing can be used to verify integrity of the data during transfer. A checksum is used to verify the integrity of files, or strings of characters, after they have been transferred from one device to another across your local network or the Internet. Checksums are calculated with hash functions. Some of the common checksums are MD5, SHA-1, SHA-256, and SHA-512. A hash function uses a mathematical algorithm to transform the data into fixed-length value that represents the data, as represented in Figure 2. The hashed value is simply there for comparison. From the hashed value, the original data cannot be retrieved directly. For example, if you forgot your password, your password cannot be recovered from the hashed value. The password must be reset. After a file is downloaded, you can verify its integrity by verifying the hash values from the source with the one you generated using any hash calculator. By comparing the hash values, you can ensure that the file has not been tampered with or corrupted during the transfer. Availability Maintaining equipment, performing hardware repairs, keeping operating systems and software up to date, and creating backups ensure the availability of the network and data to the authorized users. Plans should be in place to recover quickly from natural or man-made disasters. Security equipment or software, such as firewalls, guard against downtime because of attacks, such as denial of service (DoS). Denial of service occurs when an attack attempts to overwhelm resources so the services are not available to the users.

Types of Attackers Attackers are individuals or groups who attempt to exploit vulnerability for personal or financial gain. Attackers are interested in everything, from credit cards to product designs and anything with value. Amateurs – These people are sometimes called Script Kiddies. They are usually attackers with little or no skill, often using existing tools or instructions found on the Internet to launch attacks. Some of them are just curious, while others are trying to demonstrate their skills and cause harm. They may be using basic tools, but the results can still be devastating. Hackers – This group of attackers break into computers or networks to gain access. Depending on the intent of the break-in, these attackers are classified as white, gray, or black hats. The white hat attackers break into networks or computer systems to discover weaknesses so that the security of these systems can be improved. These break-ins are done with prior permission and any results are reported back to the owner. On the other hand, black hat attackers take advantage of any vulnerability for illegal personal, financial or political gain. Gray hat attackers are somewhere between white and black hat attackers. The gray hat attackers may find a vulnerability in a system. Gray hat hackers may report the vulnerability to the owners of the system if that action coincides with their agenda. Some gray hat hackers publish the facts about the vulnerability on the Internet so that other attackers can exploit it. The figure gives details about the terms white hat hacker, black hat hacker, and gray hat hacker. Organized Hackers – These hackers include organizations of cyber criminals, hacktivists, terrorists, and state- sponsored hackers. Cyber criminals are usually groups of professional criminals focused on control, power, and wealth. The criminals are highly sophisticated and organized, and they may even provide cybercrime as a service to other criminals. Hacktivists make political statements to create awareness to issues that are important to them. State- sponsored attackers gather intelligence or commit sabotage on behalf of their government. These attackers are usually highly trained and well-funded, and their attacks are focused on specific goals that are beneficial to their government. Social Engineering Social engineering is an access attack that attempts to manipulate individuals into performing actions or divulging confidential information. Social engineers often rely on people’s willingness to be helpful but also prey on people’s weaknesses. For example, an attacker could call an authorized employee with an urgent problem that requires immediate network access. The attacker could appeal to the employee’s vanity, invoke authority using name-dropping techniques, or appeal to the employee’s greed. These are some types of social engineering attacks:  Pretexting - This is when an attacker calls an individual and lies to them in an attempt to gain access to privileged data. An example involves an attacker who pretends to need personal or financial data in order to confirm the identity of the recipient.  Tailgating - This is when an attacker quickly follows an authorized person into a secure location.  Something for Something (Quid pro quo) - This is when an attacker requests personal information from a party in exchange for something, like a free gift.

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Wi-Fi Password Cracking Wi-Fi password cracking is the process of discovering the password used to protect a wireless network. These are some techniques used in password cracking: Social engineering – The attacker manipulates a person who knows the password into providing it. Brute-force attacks – The attacker tries several possible passwords in an attempt to guess the password. If the password is a 4-digit number, for example, the attacker would have to try every one of the 10000 combinations. Brute- force attacks usually involve a word-list file. This is a text file containing a list of words taken from a dictionary. A program then tries each word and common combinations. Because brute-force attacks take time, complex passwords take much longer to guess. A few password brute-force tools include Ophcrack, L0phtCrack, THC Hydra, RainbowCrack, and Medusa. Network sniffing – By listening and capturing packets sent on the network, an attacker may be able to discover the password if the password is being sent unencrypted (in plain text). If the password is encrypted, the attacker may still be able to reveal it by using a password cracking tool. Phishing Phishing is when a malicious party sends a fraudulent email disguised as being from a legitimate, trusted source. The message intent is to trick the recipient into installing malware on their device, or into sharing personal or financial information. An example of phishing is an email forged to look like it was sent by a retail store asking the user to click a link to claim a prize. The link may go to a fake site asking for personal information, or it may install a virus. Spear phishing is a highly targeted phishing attack. While phishing and spear phishing both use emails to reach the victims, spear phishing emails are customized to a specific person. The attacker researches the target’s interests before sending the email. For example, an attacker learns the target is interested in cars, and has been looking to buy a specific model of car. The attacker joins the same car discussion forum where the target is a member, forges a car sale offering and sends email to the target. The email contains a link for pictures of the car. When the target clicks on the link, malware is installed on the target’s computer. Vulnerability Exploitation Exploiting vulnerabilities is another common method of infiltration. Attackers will scan computers to gain information about them. Below is a common method for exploiting vulnerabilities: Step 1 . Gather information about the target system. This could be done in many different ways such as a port scanner or social engineering. The goal is to learn as much as possible about the target computer. Step 2 .One of the pieces of relevant information learned in step 1 might be the operating system, its version, and a list of services running on it. Step 3 . When the target’s operating system and version is known, the attacker looks for any known vulnerabilities specific to that version of OS or other OS services. Step 4 . When a vulnerability is found, the attacker looks for a previously written exploit to use. If no exploits have been written, the attacker may consider writing an exploit.

Figure 1 portrays an attacker using whois , a public Internet database containing information about domain names and their registrants. Figure 2 portrays an attacker using the nmap tool, a popular port scanner. With a port scanner, an attacker can probe ports of a target computer to learn about which services are running on that computer. Advanced Persistent Threats One way in which infiltration is achieved is through advanced persistent threats (APTs). They consist of a multi-phase, long term, stealthy and advanced operation against a specific target. Due to its complexity and skill level required, an APT is usually well funded. An APT targets organizations or nations for business or political reasons. Usually related to network-based espionage, APT’s purpose is to deploy customized malware on one or multiple of the target’s systems and remain undetected. With multiple phases of operation and several customized types of malware that affect different devices and perform specific functions, an individual attacker often lacks the skill-set, resources or persistence to carry out APTs. DoS Denial-of-Service (DoS) attacks are a type of network attack. A DoS attack results in some sort of interruption of network service to users, devices, or applications. There are two major types of DoS attacks: Overwhelming Quantity of Traffic - This is when a network, host, or application is sent an enormous quantity of data at a rate which it cannot handle. This causes a slowdown in transmission or response, or a crash of a device or service. Maliciously Formatted Packets - This is when a maliciously formatted packet is sent to a host or application and the receiver is unable to handle it. For example, an attacker forwards packets containing errors that cannot be identified by the application, or forwards improperly formatted packets. This causes the receiving device to run very slowly or crash. DoS attacks are considered a major risk because they can easily interrupt communication and cause significant loss of time and money. These attacks are relatively simple to conduct, even by an unskilled attacker. DDoS A Distributed DoS Attack (DDoS) is similar to a DoS attack but originates from multiple, coordinated sources. As an example, a DDoS attack could proceed as follows: An attacker builds a network of infected hosts, called a botnet. The infected hosts are called zombies. The zombies are controlled by handler systems. The zombie computers constantly scan and infect more hosts, creating more zombies. When ready, the hacker instructs handler systems to make the botnet of zombies carry out a DDoS attack. SEO Poisoning Search engines such as Google work by ranking pages and presenting relevant results based on users’ search queries. Depending on the relevancy of web site content, it may appear higher or lower in the search result list. SEO, short for Search Engine Optimization, is a set of techniques used to improve a website’s ranking by a search engine. While many legitimate companies specialize in optimizing websites to better position them, a malicious user could use SEO to make a malicious website appear higher in search results. This technique is called SEO poisoning.

The most common goal of SEO poisoning is to increase traffic to malicious sites that may host malware or perform social engineering. To force a malicious site to rank higher in search results, attackers take advantage of popular search terms. What is a Blended Attack? Blended attacks are attacks that use multiple techniques to compromise a target. By using several different attack techniques at once, attackers have malware that are a hybrid of worms, Trojan horses, spyware, keyloggers, spam and phishing schemes. This trend of blended attacks is revealing more complex malware and placing user data at great risk. The most common type of blended attack uses spam email messages, instant messages or legitimate websites to distribute links where malware or spyware is secretly downloaded to the computer. Another common blended attack uses DDoS combined with phishing emails. First, DDoS is used to take down a popular bank website and send emails to the bank's customers, apologizing for the inconvenience. The email also directs the users to a forged emergency site where their real login information can be stolen. Many of the most damaging computer worms like Nimbda, CodeRed, BugBear, Klez and Slammer are better categorized as blended attacks, as shown below:  Some Nimbda variants used email attachments; file downloads from a compromised web server; and Microsoft file sharing (e.g., anonymous shares) as propagation methods.  Other Nimbda variants were able to modify the system’s guest accounts to provide the attacker or malicious code with administrative privileges. The recent Conficker and ZeuS/LICAT worms were also blended attacks. Conficker used all the traditional distribution methods. What is Impact Reduction? While the majority of successful companies today are aware of common security issues and put considerable effort towards preventing them, no set of security practices is 100% efficient. Because a breach is likely to happen if the prize is big, companies and organizations must also be prepared to contain the damage. It is important to understand that the impact of a breach is not only related to the technical aspect of it, stolen data, damaged databases, or damage to intellectual property, the damage also extends to the company’s reputation. Responding to a data breach is a very dynamic process. Below are some important measures a company should take when a security breach is identified, according to many security experts:  Communicate the issue. Internally employees should be informed of the problem and called to action. Externally, clients should be informed through direct communication and official announcements. Communication creates transparency, which is crucial in this type of situation.  Be sincere and accountable in case the company is at fault.  Provide details. Explain why the situation took place and what was compromised. It is also expected that the company take care of the costs of identity theft protection services for affected customers.

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 Understand what caused and facilitated the breach. If necessary, hire forensics experts to research and learn the details.  Apply what was learned from the forensics investigation to ensure similar breaches do not happen in the future.  Ensure all systems are clean, no backdoors were installed, and nothing else has been compromised. Attackers will often attempt to leave a backdoor to facilitate future breaches. Make sure this does not happen.  Educate employees, partners, and customers on how to prevent future breaches. Chapter 2: Attacks, Concepts and Techniques This chapter covered the ways that cybersecurity professionals analyze what has happened after a cyberattack. It explains security software and hardware vulnerabilities and the different categories of security vulnerabilities. The different types of malicious software (known as malware) and the symptoms of malware explained. Some of the malware that was discussed included viruses, worms, Trojan horses, spyware, adware, and others. The different ways that attackers can infiltrate a system was covered, including social engineering, Wi-Fi Password Cracking, Phishing, and vulnerability exploitation. The different types of denial of service attacks were also explained. Blended attacks use multiple techniques to infiltrate and attack a system. Many of the most damaging computer worms like Nimbda, CodeRed, BugBear, Klez and slammer are better categorized as blended attacks. When an attack cannot be prevented, it is the job of a cybersecurity professional is to reduce the impact of that attack. If you would like to further explore the concepts in this chapter, please check out the Additional Resources and Activities page in Student Resources.

Internal and External Threats Internal Security Threats Attacks can be originated from within an organization or from outside of the organization, as shown in the figure. An internal user, such as an employee or contract partner, can accidently or intentionally:  Mishandle confidential data  Threaten the operations of internal servers or network infrastructure devices  Facilitate outside attacks by connecting infected USB media into the corporate computer system  Accidentally invite malware onto the network through malicious email or websites Internal threats also have the potential to cause greater damage than external threats, because internal users have direct access to the building and its infrastructure devices. Employees also have knowledge of the corporate network, its resources, and its confidential data, as well as different levels of user or administrative privileges. External Security Threats External threats from amateurs or skilled attackers can exploit vulnerabilities in network or computing devices, or use social engineering to gain access.

Legal Issues in Cybersecurity Cybersecurity professionals must have the same skills as hackers, especially black hat hackers, in order to protect against attacks. One difference between a hacker and a cybersecurity professional is that the cybersecurity professional must work within legal boundaries. Personal Legal Issues You do not even have to be an employee to be subject to cybersecurity laws. In your private life, you may have the opportunity and skills to hack another person’s computer or network. There is an old saying, “Just because you can does not mean you should.” Keep this in mind. Most hackers leave tracks, whether they know it or not, and these tracks can be followed back to the hacker. Cybersecurity professionals develop many skills which can be used for good or evil. Those who use their skills within the legal system, to protect infrastructure, networks, and privacy are always in high demand. Corporate Legal Issues Most countries have some cybersecurity laws in place. They may have to do with critical infrastructure, networks, and corporate and individual privacy. Businesses are required to abide by these laws. In some cases, if you break cybersecurity laws while doing your job, it is the company that may be punished and you could lose your job. In other cases, you could be prosecuted, fined, and possibly sentenced. In general, if you are confused about whether an action or behavior might be illegal, assume that it is illegal and do not do it. Your company may have a legal department or someone in the human resources department who can answer your questions before you do something illegal. International Law and Cybersecurity The area of cybersecurity law is much newer than cybersecurity itself. As mentioned before, most countries have some laws in place, and there will be more laws to come. International cybersecurity law is still quite new. The International Multilateral Partnership Against Cyber Threats (IMPACT) is the first, international public-private partnership that is focused on cyber threats. IMPACT is a global partnership of world governments, industries, and academia dedicated to improving global capabilities when dealing with cyber threats. The figure shows the website for IMPACT.

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Ethical Issues in Cybersecurity In addition to working within the confines of the law, cybersecurity professionals must also demonstrate ethical behavior. Personal Ethical Issues A person may act unethically and not be subject to prosecution, fines or imprisonment. This is because the action may not have been technically illegal. But that does not mean that the behavior is acceptable. Ethical behavior is fairly easy to ascertain. It is impossible to list all of the various unethical behaviors that can be exhibited by someone with cybersecurity skills. Below are just two. Ask yourself:  Would I want to discover that someone has hacked into my computer and altered images in my social network sites?  Would I want to discover that an IT technician whom I trusted to fix my network, told colleagues personal information about me that was gained while working on my network? If your answer to any of these questions was ‘no’, then do not do such things to others. Corporate Ethical Issues Ethics are codes of behavior that are sometimes enforced by laws. There are many areas in cybersecurity that are not covered by laws. This means that doing something that is technically legal still may not be the ethical thing to do. Because so many areas of cybersecurity are not (or not yet) covered by laws, many IT professional organizations have created codes of ethics for persons in the industry. Below is a list of three organizations with Codes of Ethics:  The CyberSecurity Institute (CSI) has published a code of ethics that you can read here .  The Information Systems Security Association (ISSA) has a code of ethics found here .  The Association of Information Technology Professionals (AITP) has both a code of ethics and a standard of conduct found here . Cisco has a team devoted exclusively to ethical business conduct. Go here to read more about it. This site contains an eBook about Cisco’s Code of Business Conduct, and a pdf file. In both files is an “Ethics Decision Tree”, as shown in the figure. Even if you do not work for Cisco, the questions and answers found in this decision tree can easily be applied to your place of work. As with legal questions, in general, if you are confused about whether an action or behavior might be unethical, assume that it is unethical and do not do it. There may be someone in your company’s human resources or legal department who can clarify your situation before you do something that would be considered unethical. Search online to find other IT-related organizations with codes of ethics. Try to find what they all have in common.

ISSA Code of Ethics The primary goal of the Information Systems Security Association, Inc. (ISSA) is to promote practices that will ensure the confidentiality, integrity, and availability of organizational information resources. To achieve this goal, members of the Association must reflect the highest standards of ethical conduct. Therefore, ISSA has established the following Code of Ethics and requires its observance as a prerequisite for continued membership and affiliation with the Association. As an ISSA member, guest and/or applicant for membership, I have in the past and will in the future:  Perform all professional activities and duties in accordance with all applicable laws and the highest ethical principles;  Promote generally accepted information security current best practices and standards;  Maintain appropriate confidentiality of proprietary or otherwise sensitive information encountered in the course of professional activities;  Discharge professional responsibilities with diligence and honesty;  Refrain from any activities which might constitute a conflict of interest or otherwise damage the reputation of or is detrimental to employers, the information security profession, or the Association; and  Not intentionally injure or impugn the professional reputation or practice of colleagues, clients, or employers.

What is Cyberwarfare? Cyberspace has become another important dimension of warfare, where nations can carry out conflicts without the clashes of traditional troops and machines. This allows countries with minimal military presence to be as strong as other nations in cyberspace. Cyberwarfare is an Internet-based conflict that involves the penetration of computer systems and networks of other nations. These attackers have the resources and expertise to launch massive Internet- based attacks against other nations to cause damage or disrupt services, such as shutting down a power grid. An example of a state-sponsored attack involved the Stuxnet malware that was designed to damage Iran’s nuclear enrichment plant. Stuxnet malware did not hijack targeted computers to steal information. It was designed to damage physical equipment that was controlled by computers. It used modular coding that was programmed to perform a specific task within the malware. It used stolen digital certificates so the attack appeared legitimate to the system. Click Play to view a video about Stuxnet. The Purpose of Cyberwarfare The main purpose of cyberwarfare is to gain advantage over adversaries, whether they are nations or competitors. A nation can continuously invade other nation’s infrastructure, steal defense secrets, and gather information about technology to narrow the gaps in its industries and military. Besides industrial and militaristic espionage, cyberwar can sabotage the infrastructure of other nations and cost lives in the targeted nations. For example, an attack can disrupt the power grid of a major city. Traffic would be disrupted. The exchange of goods and services is halted. Patients cannot get the care needed in emergency situations. Access to the Internet may also be disrupted. By affecting the power grid, the attack can affect the everyday life of ordinary citizens. Furthermore, compromised sensitive data can give the attackers the ability to blackmail personnel within the government. The information may allow an attacker to pretend to be an authorized user to access sensitive information or equipment. If the government cannot defend against the cyberattacks, the citizens may lose confidence in the government’s ability to protect them. Cyberwarfare can destabilize a nation, disrupt commerce, and affect the citizens’ faith in their government without ever physically invading the targeted nation. Chapter 1: The Need for Cybersecurity This chapter explained the features and characteristics of cybersecurity. It explained why the demand for cybersecurity professionals will only continue to increase. The content explains why your personal online identity and data is vulnerable to cyber criminals. It gives some tips on how you can protect your personal online identity and data. This chapter also discussed organizational data: what it is, where it is, and why it must be protected. It explained who the cyber attackers are and what they want. Cybersecurity professionals must have the same skills as the cyber attackers. Cybersecurity professionals must work within the bounds of the local, national and international law. Cybersecurity professionals must also use their skills ethically. Finally, this chapter briefly explained cyberwarfare and why nations and governments need cybersecurity professionals to help protect their citizens and infrastructure.

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Chapter 2: Attacks, Concepts and Techniques This chapter covers the ways that cybersecurity professionals analyze what has happened after a cyberattack. It explains security software and hardware vulnerabilities and the different categories of security vulnerabilities. The different types of malicious software (known as malware) and the symptoms of malware are discussed. The different ways that attackers can infiltrate a system is covered, as well as denial of service attacks. Most modern cyberattacks are considered to be blended attacks. Blended attacks use multiple techniques to infiltrate and attack a system. When an attack cannot be prevented, it is the job of a cybersecurity professional to reduce the impact of that attack. Finding Security Vulnerabilities Security vulnerabilities are any kind of software or hardware defect. After gaining knowledge of a vulnerability, malicious users attempt to exploit it. An exploit is the term used to describe a program written to take advantage of a known vulnerability. The act of using an exploit against a vulnerability is referred to as an attack. The goal of the attack is to gain access to a system, the data it hosts or to a specific resource. Software vulnerabilities Software vulnerabilities are usually introduced by errors in the operating system or application code, despite all the effort companies put into finding and patching software vulnerabilities, it is common for new vulnerabilities to surface. Microsoft, Apple, and other operating system producers release patches and updates almost every day. Application updates are also common. Applications such as web browsers, mobile apps and web servers are often updated by the companies or organizations responsible for them. In 2015, a major vulnerability, called SYNful Knock, was discovered in Cisco IOS. This vulnerability allowed attackers to gain control of enterprise-grade routers, such as the legacy Cisco 1841, 2811, and 3825 routers. The attackers could then monitor all network communication and had the ability to infect other network devices. This vulnerability was introduced into the system when an altered IOS version was installed in the routers. To avoid this, always verify the integrity of the downloaded IOS image and limit the physical access of the equipment to authorized personnel only. The goal of software updates is to stay current and avoid exploitation of vulnerabilities. While some companies have penetration testing teams dedicated to search, find and patch software vulnerabilities before they can get exploited, third party security researchers also specialize in finding vulnerabilities in software. Google’s Project Zero is a great example of such practice. After discovering a number of vulnerabilities in various software used by end-users, Google formed a permanent team dedicated to finding software vulnerabilities. Google Security Research can be found here . Hardware vulnerabilities Hardware vulnerabilities are often introduced by hardware design flaws. RAM memory for example, is essentially capacitors installed very close to one another. It was discovered that, due to proximity, constant changes applied to one of these capacitors could influence neighbor capacitors. Based on that design flaw, an exploit called Rowhammer was created. By repeatedly rewriting memory in the same addresses, the Rowhammer exploit allows data to be retrieved from nearby address memory cells, even if the cells are protected. Hardware vulnerabilities are specific to device models and are not generally exploited through random compromising attempts. While hardware exploits are more common in highly targeted attacks, traditional malware protection and a physical security are sufficient protection for the everyday user.

Categorizing Security Vulnerabilities Most software security vulnerabilities fall into one of the following categories: Buffer overflow – This vulnerability occurs when data is written beyond the limits of a buffer. Buffers are memory areas allocated to an application. By changing data beyond the boundaries of a buffer, the application accesses memory allocated to other processes. This can lead to a system crash, data compromise, or provide escalation of privileges. Non-validated input – Programs often work with data input. This data coming into the program could have malicious content, designed to force the program to behave in an unintended way. Consider a program that receives an image for processing. A malicious user could craft an image file with invalid image dimensions. The maliciously crafted dimensions could force the program to allocate buffers of incorrect and unexpected sizes. Race conditions – This vulnerability is when the output of an event depends on ordered or timed outputs. A race condition becomes a source of vulnerability when the required ordered or timed events do not occur in the correct order or proper timing. Weaknesses in security practices – Systems and sensitive data can be protected through techniques such as authentication, authorization, and encryption. Developers should not attempt to create their own security algorithms because it will likely introduce vulnerabilities. It is strongly advised that developers use security libraries that have already created, tested, and verified. Access-control problems – Access control is the process of controlling who does what and ranges from managing physical access to equipment to dictating who has access to a resource, such as a file, and what they can do with it, such as read or change the file. Many security vulnerabilities are created by the improper use of access controls. Nearly all access controls and security practices can be overcome if the attacker has physical access to target equipment. For example, no matter what you set a file’s permissions to, the operating system cannot prevent someone from bypassing the operating system and reading the data directly off the disk. To protect the machine and the data it contains, physical access must be restricted and encryption techniques must be used to protect data from being stolen or corrupted.

Types of Malware Short for Malicious Software, malware is any code that can be used to steal data, bypass access controls, or cause harm to, or compromise a system. Below are a few common types of malware: Spyware – This malware is design to track and spy on the user. Spyware often includes activity trackers, keystroke collection, and data capture. In an attempt to overcome security measures, spyware often modifies security settings. Spyware often bundles itself with legitimate software or with Trojan horses. Adware – Advertising supported software is designed to automatically deliver advertisements. Adware is often installed with some versions of software. Some adware is designed to only deliver advertisements but it is also common for adware to come with spyware. Bot – From the word robot, a bot is malware designed to automatically perform action, usually online. While most bots are harmless, one increasing use of malicious bots are botnets. Several computers are infected with bots which are programmed to quietly wait for commands provided by the attacker. Ransomware – This malware is designed to hold a computer system or the data it contains captive until a payment is made. Ransomware usually works by encrypting data in the computer with a key unknown to the user. Some other versions of ransomware can take advantage of specific system vulnerabilities to lock down the system. Ransomware is spread by a downloaded file or some software vulnerability. Scareware – This is a type of malware designed to persuade the user to take a specific action based on fear. Scareware forges pop-up windows that resemble operating system dialogue windows. These windows convey forged messages stating the system is at risk or needs the execution of a specific program to return to normal operation. In reality, no problems were assessed or detected and if the user agrees and clears the mentioned program to execute, his or her system will be infected with malware. Rootkit – This malware is designed to modify the operating system to create a backdoor. Attackers then use the backdoor to access the computer remotely. Most rootkits take advantage of software vulnerabilities to perform privilege escalation and modify system files. It is also common for rootkits to modify system forensics and monitoring tools, making them very hard to detect. Often, a computer infected by a rootkit must be wiped and reinstalled. Virus - A virus is malicious executable code that is attached to other executable files, often legitimate programs. Most viruses require end-user activation and can activate at a specific time or date. Viruses can be harmless and simply display a picture or they can be destructive, such as those that modify or delete data. Viruses can also be programmed to mutate to avoid detection. Most viruses are now spread by USB drives, optical disks, network shares, or email. Trojan horse - A Trojan horse is malware that carries out malicious operations under the guise of a desired operation. This malicious code exploits the privileges of the user that runs it. Often, Trojans are found in image files, audio files or games. A Trojan horse differs from a virus because it binds itself to non-executable files. Worms – Worms are malicious code that replicate themselves by independently exploiting vulnerabilities in networks. Worms usually slow down networks. Whereas a virus requires a host program to run, worms can run by themselves. Other than the initial infection, they no longer require user participation. After a host is infected, the worm is able to spread very quickly over the network. Worms share similar patterns. They all have an enabling vulnerability, a way to propagate themselves, and they all contain a payload. Worms are responsible for some of the most devastating attacks on the Internet. As shown in Figure 1, in 2001 the Code Red worm had infected 658 servers. Within 19 hours, the worm had infected over 300,000 servers as shown in Figure 2. Man-In-The-Middle (MitM) – MitM allows the attacker to take control over a device without the user’s knowledge. With that level of access, the attacker can intercept and capture user information before relaying it to its intended destination. MitM attacks are widely used to steal financial information. Many malware and techniques exist to provide attackers with MitM capabilities.

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Man-In-The-Mobile (MitMo) – A variation of man-in-middle, MitMo is a type of attack used to take control over a mobile device. When infected, the mobile device can be instructed to exfiltrate user-sensitive information and send it to the attackers. ZeuS, an example of an exploit with MitMo capabilities, allows attackers quietly to capture 2-step verification SMS messages sent to users. Symptoms of Malware Regardless of the type of malware a system has been infected with, these are common malware symptoms:  There is an increase in CPU usage.  There is a decrease in computer speed.  The computer freezes or crashes often.  There is a decrease in Web browsing speed.  There are unexplainable problems with network connections.  Files are modified.  Files are deleted.  There is a presence of unknown files, programs, or desktop icons.  There are unknown processes running.  Programs are turning off or reconfiguring themselves.  Email is being sent without the user’s knowledge or consent.

Social Engineering Social engineering is an access attack that attempts to manipulate individuals into performing actions or divulging confidential information. Social engineers often rely on people’s willingness to be helpful but also prey on people’s weaknesses. For example, an attacker could call an authorized employee with an urgent problem that requires immediate network access. The attacker could appeal to the employee’s vanity, invoke authority using name-dropping techniques, or appeal to the employee’s greed. These are some types of social engineering attacks:  Pretexting - This is when an attacker calls an individual and lies to them in an attempt to gain access to privileged data. An example involves an attacker who pretends to need personal or financial data in order to confirm the identity of the recipient.  Tailgating - This is when an attacker quickly follows an authorized person into a secure location.  Something for Something (Quid pro quo) - This is when an attacker requests personal information from a party in exchange for something, like a free gift.

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