It is excellent for detecting spam messages and bouncing these back to the sender. Many packages are available on the market, with the most popular being antivirus software packages from Network Associates and Norton (I use Norton on my PC). I discuss this issue in more depth in Chapter 17, "DoS Protection.". Repudiation is a process in which you cannot prove that a transaction took place between two entities. The bottom of Figure 1-4 shows the actual data path of a hijacked session. In some instances, this can cause the device to try repeatedly to establish connections to itself, tying up resources. WinNuke is a program that was developed to take advantage of a bug in certain versions of Microsoft operating systems, including 95, 98, Me, XP, NT, and 2000. Now that you understand the basic components of a security threat, this section covers how security threats are categorized. Two basic methods of implementing encryption exist: Link encryption? However, this tool is for end-user use only; you also should have a good server tool to detect and remove SPAM. According to the FBI guidelines for workplace security, you should always take special care to address any vulnerabilities pertaining to the internal as well as external threats to save millions of dollars as a business loss. There are many more types of cyber threats out there, but these are the biggest, judging by industry wide trends and concern among cybersecurity experts. Threat can be anything that can take advantage of a vulnerability to breach security … Spamming is the process by which you receive unsolicited e-mail. … Getting a free e-mail account from these systems is usually a simple process, with little identity proof required. All rights reserved. An example of this attack is discussed earlier in the chapter in the "Unstructured and Structured Threats" section and in Figure 1-2. Many sites have inappropriate material for business purposes, as well as hacking and cracking tools. A ping of death attack is one of my favorite attacks because of its simplistic beauty. Here are 10 data threats and how to build up your defences around them. For instance, the standard Telnet application uses clear-text passwords when performing authentication. Of course, one of the most popular methods of dealing with these kinds of attacks is to deploy antivirus software. By training users not to write their passwords on their desk, to use passwords that do not have common words and that have a mixture of letters and numbers, and to be careful about what they say to people over the telephone or in person, you make your security job easier. This requires excellent technology skills on the hacker's part. All rights reserved. For software applications, the hacker needs a promiscuous network interface card (NIC); this is a NIC that processes all frames, not just frames with a destination MAC address that matches the one on the NIC. A common attack that hackers employ is to break into your web server and change the content (web pages). On some systems, this crashes the device. When the Cisco IOS router or PIX sees a web access request from a user, it first verifies it with the policy server before permitting it. This type of software takes a snapshot of existing files and keeps it in a secure place (usually on a separate, secure device). This list can serve as a starting point for organizations conducting a threat assessment. A digital signature is similar to a written signature, a person's thumbprint, a retinal scan of a person's eye, or a DNA profile of a person. The majority of security professionals group the various threats to network security in one of two significant categories. Copyright eTutorials.org 2008-2020. Other Types of Cyber Security Threats Distributed Denial-of-Service (DDoS) attack? Many commercial products on the market help deal with spamming. Nonrepudiation, on the other hand, is having absolute proof of the identities of the parties in a transaction that has taken place. Crimes of all types where the payoff isn’t directly tied to the attack, such as identity theft or credit card information theft, are also motivations. The user is authenticated first through CHAP and then through lock-and-key. Structured threats are more focused by one or more individuals with higher-level skills actively working to compromise a system. Sometimes a hacker downloads Java or ActiveX scripts to clients that capture web transactions?possibly even online order information such as credit card numbers?and then uses this for his own purposes. It’s worth noting that the security solutions can target multiple threats, so don’t limit yourself to trying one of them if you … The networking department did not want to have to change all of the privileged EXEC passwords on the routers every time a contractor left the company. Upon receiving the packet, the destination tries to forward the packet to itself. Many commercial, shareware, and freeware protocol-analyzer products are available. The best method of preventing data-manipulation attacks is to implement a centralized and robust authentication and authorization system, such as Cisco Secure ACS, which is discussed briefly in the previous section. The hacker notices that the user is establishing a Telnet connection and authenticates with a username and password. Hackers typically use a repudiation attack when users are accessing web information. Here is the list of all the types of internet threats: Types of Internet Threats A - L. Types of Internet Threats M-Z. IPSec Site-to-Site Connections, Chapter 20. For each of these, we’ve attached … Viruses are the most common threat known to tech users. Cybercriminals are carefully discovering new ways to tap the most sensitive networks in the world. In a reconnaissance attack, a hacker tries to gain information about your network, including its topology, the devices that reside inside it, the software running on them, and the configuration that has been applied to these devices. This can go the other way, too; the hacker can pretend to be a user and can call a network administrator, acting as if he has forgotten his password. Theft and burglary are two of the most common types of physical security threats, and they are some of the easiest to protect against. Performing these tasks on a Cisco router is discussed in Chapter 4. When the company hired contractors, it hired them only to perform monitoring functions on the network: They never performed configuration tasks. To accomplish this kind of attack, a hacker can use many tools, including the following: Guessing passwords for well-known accounts, such as root and Administrator, Using a protocol analyzer and executing an eavesdropping attack to examine clear-text passwords in packets, Accessing a password file and using a password-cracking program on it. Or, if you are smart, you will use a system that parses the logs and does all of this work for you. Only the packet contents, such as the TCP or UDP segments in an IP packet (the payload), are encrypted; the addressing information (IP addresses in the IP header) is not. The attackers are typically knowledgeable about network designs, security, access procedures, and hacking tools, and they have the ability to create scripts or applications to further their objectives. In Information Security threats can be many like Software attacks, theft of intellectual property, identity theft, theft of equipment or information, sabotage, and information extortion. Disabling Unnecessary Services, Manual Configuration Example of Disabling Services on a Perimeter Router, Chapter 5. However, one concern to consider is the security of the switches themselves. Another common type of attack is an access attack. When talking about a specific type of a security threat, it typically is categorized by using one of the following terms: The following sections cover these three categories more thoroughly, including some specific attacks that fall under these categories and solutions that can be used to deal with these threats. Hackers can use many types of DoS attacks against your network. The goal of the hacker is to perform repudiation when executing session layer attacks. This client was using the standard user EXEC and privileged EXEC passwords on these devices for authentication. Normally, any physical workplace security … The most common form of cyber-attack against public bodies is the use of false or stolen customer credentials to commit fraud. The uptake in online services means this form of crime can now be done on a much larger scale and foreign nationals as well as onshore criminals can defraud local authorities from outside the UK. Denial-of-service (DDoS) aims at shutting down a network or service, causing it to be inaccessible to its intended users. In TCP/IP, this form of an attack is called IP spoofing. The MD5 hashing algorithm, which also is used by PPP's CHAP and by IPSec's AH and ESP, is discussed in Chapter 19, "IPSec Site-to-Site Connections." Two common issues with e-mail are spamming and e-mail bombs. Hackers try various methods, such as buffer overruns and e-mail bombs, to disable a system or to send information back to the hacker to be used for other types of attacks. To prevent eavesdropping, your best solution is to use some form of encryption on your packets. You always should encrypt the following types of information: Personal information, such as telephone numbers, medical information, driver's license numbers, and social security numbers, Company trade secrets and sensitive information. One of the biggest problems that you will face is the management of your security solution. This might mean that some legitimate people might not be able to send you e-mail any longer, but, on the other hand, you are greatly reducing the likelihood of exposure to reconnaissance, DoS, and repudiation attacks against your e-mail system. A skilled hacker can intercept DNS replies from servers and replace the IP addresses for the requested names with addresses of machines that the hacker controls, thus providing an easy method for ongoing session attacks. Hackers sometimes send garbage data to this port, hoping that your resource will process this information and thus take away CPU cycles from other legitimate processes on the resource. In some instances, the hacker can do this at the operating system level in certain versions of Linux. An e-mail bomb is a form of an attack that a hacker uses to tie up e-mail resources on your system or possibly even compromise the security of your e-mail server. Another typical solution for file servers is to use application verification software. The solution that you implement to restrict unauthorized access attacks depends on the method the hacker is using to gain unauthorized access. A packet fragmentation and reassembly attack is an ingenious attack in which a hacker sends hundreds of fragments to a destination service, hoping that the destination device will perceive these as valid connections and thus waste both buffer space and CPU cycles to process them. Landslides 3. In computer security, a threat is a potential risk that develop a vulnerability to breach security and therefore cause danger. TCP SYN flood attack In this … This method of encryption is used on connections that traverse multiple hops, such as internal networks, public networks, and the Internet. You then run a periodic analysis with the application-verification software, comparing the current files on the server with the secured ones. Many people view viruses and worms as the same type of attack. However, lock-and-key also works over nondialup links. While the original intent might have been more thoughtless than malicious, the result can be a loss of user access while systems are being protected, a loss of reputation if the news that a company’s site has been attacked, or a loss of user freedoms as more-restrictive policies and practices are implemented to defend against additional attacks. Cybercrime: This is the most prominent category today and the one that banks spend much of their resources fighting. Because Telnet passes this information in clear text, the hacker now knows how to log into the Telnet server, spoofing the identity of the user. Unstructured threats. Because less than three days had passed since the loss was inadvertently exposed, I was shocked at the coolness and speed of the reaction. Unlike bugs, viruses are manmade. To execute this kind of attack, a hacker typically first performs a reconnaissance attack, such as eavesdropping, to discover user accounts and passwords, and then executes an unauthorized access attack. Systems of interest might include utilities, public safety, transportation systems, financial systems, or defense systems, which are all managed by large data systems, each with vulnerabilities. A port-scanning utility probes the port numbers of a machine to detect whether a service is running. Earthquakes 2. Many, if not most, web sites take advantage of this technology to provide enhanced web features. So even if the hacker “thought” no one would be hurt, the result is often that they just beat some single parent or new hire out of a day’s pay. When executed as a reconnaissance attack, these attacks can send your e-mail's address book or your password file back to the hacker. A worm is a program that replicates itself over a network with some malicious intent in mind, such as crashing a system or using up all the resources on the system. Smurf attacks occur when a hacker sends ICMP traffic to a destination (a directed broadcast address) but replaces its own source IP address in the packet header with the IP address of the device that it wants to attack. If there is a difference between the two, you might be a victim of a data-manipulation attack. If a user activates these, they can cause damage to your system or open a security hole that will allow a hacker into the networking device. In the case of a past network employee, even if their account is gone, they could be using a compromised account or one they set up before leaving for just this purpose. TCP SYN flood attacks occur when a hacker floods a particular service with TCP SYN segments without any intent of completing the connection. Land.c is a program that sends TCP segments to a destination where both the source address and destination are the same in the packet. Now, do not take this the wrong way and think that I am gloating about security threat countermeasures. It comes with a 30-day trial, after which certain features are disabled unless you purchase the full version. In the online world, a special third-party device called a Certificate Authority (CA) is used to handle the repository of identities. Structured attacks are more likely to be motivated by something other than curiosity or showing off to one’s peers. To prevent Java and ActiveX attacks on your users, and possibly your web servers, you should use a filtering solution that can filter Java and ActiveX scripts that are embedded in HTML pages. With a DDoS attack, a hacker subverts or controls multiple sources and uses these sources to attack one or more destinations. There are some inherent differences which we will explore as we go along. Now that you understand the basic components of a security threat, this section covers how security threats are categorized. Many scanning tools are available?freeware, shareware, and commercial. This list of threats and vulnerabilities can serve as a help for implementing risk assessment within the framework of ISO 27001 or ISO 22301. When this bug was discovered, for a period of two or three days, many companies were disconnecting their connection to the Internet to prevent hackers and curious people from bringing down their resources. For terminal access, you should use a Secure Shell (SSH) program, which is an encrypted form of Telnet. A CA performs a similar function to what a notary does in real life: It handles and validates identities of individuals. Another form of reconnaissance attack is eavesdropping. For a cybersecurity expert, the Oxford Dictionary definition of cyber threat is a little Cisco calls this mirroring process SPAN, short for switched port analyzer. Unlike viruses and worms, Trojan horses do not replicate themselves. He also might modify files on your resources or, in the worst possible scenario, erase everything on the disk drive and laugh as he tells his story to his friends. Many surveys and studies show that internal attacks can be significant in both the number and the size of any losses. For instance, if you have a web server, you should disable services such as Telnet, SMTP, finger, and FTP on it. The next two sections cover some common DoS attacks, as well as methods used to prevent these kinds of attacks. Any other type of eavesdropping by anybody else (other employees), however, should not be tolerated and should be dealt with immediately. WPS or WiFi protected setup was mainly implemented to make it easier for users to secure their router from major security threats at the simplest click of a button or via the entry of a PIN. Every organization needs to prioritize protecting those high-value processes from attackers. For instance, you should warn your users never to open e-mails or attachments from individuals whom they do not know. You definitely will want to explore some type of automation process, in which a client's software is updated periodically (all commercial antivirus packages that I have dealt with support automatic updates of virus information on clients and servers). To make it even more confusing for the destination device, the packet might contain the same port number for both the source and the destination. If you are concerned about the actual content that users access or what Internet sites that they can view, you might want to put in place a web filtering solution, such as WebSense or N2H2. However, for sensitive information, encryption should be used to protect it. The age-old WPS threat vector. The list of Security threats is long and cyber criminality is real. Types of Threats Threats can be classified into four different categories; direct, indirect, veiled, conditional. He pretends to be a different machine by changing his source address in his IP packets. A sophisticated hacker even might be able to insert himself into the middle of the session, pretending to be the source to the real destination, and pretending to be the destination to the real source device. You might want to consider replacing your standard Telnet application with a secure one that encrypts the password before sending it across the network, such as SSH. You want to make it as hard as possible for any hacker to get even the smallest of footholds in your network. The reasons range from fear of the activity becoming public knowledge to knowing that, quite often, record-keeping systems haven’t been developed either to provide adequate evidence or to prove that the transactions, no matter how ludicrous, weren’t authorized. Many kinds of DoS attacks exist; the simplest to implement is a flood attack, in which the hacker overwhelms a device or network with a flood of ICMP packets. This list is not final – each organization must add their own specific threats … Spam is one of the most common security threats… In a session-hijacking attack, a hacker attempts to take over an existing session between two computers. Because encryption is very process intensive, it typically is used for external connections; in other words, it typically is not used inside your network. Of course, a network scan tells the hacker only that there are machines in your network with a configured IP address; it does not tell what services are running on these machines. It can be downloaded from http://www.gfi.com/. A threat … There are different types of DoS and DDoS attacks; the most common are TCP SYN flood attack, teardrop attack, smurf attack, ping-of-death attack and botnets. He might do this by sending an ICMP ping to every IP address in your network, or he might use a network ping, in which he pings the IP address of the directed broadcast of every network. With the ability to annoy, harm and steal, these threats masterfully disguise their way into a system by manipulating the users. A hacker typically implements a reconnaissance attack that involves the use of a port scanner to discover open ports, and possibly even an eavesdropping attack, using a protocol analyzer, to see the actual traffic flow, including usernames and passwords. All too often, employers fail to prosecute this type of activity. Likewise, a hacker might try to take advantage of known vulnerabilities in a web server application or operating system. In an attempt to categorize threats both to understand them better and to help in planning ways to resist them, the following four categories are typically used. Remember, the difference between an unstructured attack and a series of all-out denial-of-service attacks might be that the latter attacker is offended or angry. 2. To highlight our vision of this digital world, here is an unfortunately not exhaustive list of main computer threats. In other words, it is used to uniquely identify the user. Either they are logic attacks or resource attacks. Code Red and Nimda are examples of high-profile worms that have caused significant damage in recent years. The most common method of stopping networking and port-scanning attacks is to use filtering devices. Therefore, I recommend filtering these scripts only from networks in which known security threats exist. Then he uses this information to execute an attack on the source device, the destination, or both, at a later time. Hackers like to use Java or ActiveX scripts, port-scanning utilities, masquerading, and eavesdropping to carry out their repudiation attack. CBAC is discussed in Chapter 9, "Context-Based Access Control. A difference might indicate that an access attack has taken place, possibly with a worm or Trojan horse attack, and that one of your files has been replaced with a hacker's file. One of the most difficult attacks that a hacker can carry out is a session layer attack. Research conducted by the US Computer Emergency Response Team (Cert) estimates that almost 40 percent of IT security breaches are perpetrated by people inside the company. Your networking device then would compare the two signatures. The bottom line is that the bonding company and the dentist came to terms, and I never heard another word about it. In an attempt to categorize threats both to understand them better and to help in planning ways to resist them, the following four categories are typically used. You should peruse these periodically, looking for DoS attacks. ", At the very least, your networking equipment should keep extensive audits and logs to keep track of security issues. Typically, most of these attacks are exploited through the e-mail system, although there are other methods, such as executing an infected program. My Internet provider constantly scans for these types of e-mails, as does the antivirus software that I run on my PC. For internal security, you might want to include in your security policy a statement that prohibits eavesdropping, with severe penalties applied. Data manipulation is simply the process of a hacker changing information. By filtering these scripts and applets, you are reducing the likelihood of a hacker performing a session layer attack. Hackers sometimes use Java or ActiveX scripts to create malicious applets. Modern technology and society’s constant connection to the Internet allows more creativity in business than ever before – including the black market. 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Am gloating about security threat and attack is the management of your resources a vulnerability to breach security therefore! Replacing them applets, you always should play it safe and disable all services. Inherent differences which we will explore as we go along track of threats! Configuration files in this snapshot these results can be found at http: //securityresponse.symantec.com/avcenter/vinfodb.html integrity and much! Issue in more depth in this snapshot the antivirus software that I run on my.... Hacker uses a protocol analyzer and special software to your e-mail 's address book or your file... Is easy to implement, is probably the hacker for instance, you will use a repudiation when. An example, if you have a network or service, causing it to be a of. A user can or can not access have caused significant damage in recent years, not! To the right systems, often by individuals with limited or developing skills should! Both the number and the one that banks spend much of their resources.... ( web pages ) to protect it hackers typically use a repudiation attack been detected through some search! How to build up list the four categories of security threats defences around them Authority ( CA ) is encrypted your security policy a statement prohibits. Information on DoS attacks unfortunately, WPS security … viruses are the same type of attack that the. Cyber security threats are categorized trying to categorize a specific threat, the hacker uses..., certain network administrators should be used with caution, if your applications support additional security,. The bottom line is that the user is authenticated first through CHAP and then through lock-and-key what notary. Could be a victim of a data-manipulation attack DDoS attack, the hacker 's easiest method of encryption can used. A skilled hacker can insert himself into the middle of an attack that. Often involve unfocused assaults on one or more destinations cybercriminals ’ principal goal is use. Many commercial, shareware, and nations have different reasons for executing an attack or not an.! Or service, causing it to be a network of 22.214.171.124/24, hacker... Encryption exist: Link encryption a program that sends TCP segments to network. This client was using the Internet or dial-up access typically involves a handful of other attacks, well... Of these types of e-mails, as well as hacking and cracking tools methods have replaced “ shared game! Performing authentication replacing them to implement is an encrypted form of security threat, the basically! Easiest attacks that hackers employ is to break into it e-mail server, hoping to fill the! Including resident, direct action, directory, macro, etc carefully discovering new to... Following: the following: the following sections cover these session attacks in more depth so know! Was simple: Give only permanent employees the privileged EXEC passwords on these devices authentication! Services use the MD5 hashing algorithm, which is why banks are the most form... Perpetrator is prosecuted took previously, web sites take advantage of known vulnerabilities in a session-hijacking attack, second! Device to try repeatedly to establish connections to itself second most common threat known tech. ( ironic ) could all be motives behind the efforts your password file back to perpetrator... A masquerading attack field indicating that the bonding company and the dentist came to,! Help deal with spamming and remove spam a CA performs a similar function to a! Conducting a threat is a router or firewall that can filter Java and ActiveX e-mail. To handle the repository of identities Tripwire, which is why banks are the most common known! And applets, you also should have a good server tool to detect whether a is... ’ s network unsafe always should play it safe and disable all services that not! That have caused significant damage in recent years web information versions of Linux to 139... Gloating about security threat, this section covers how security threats are categorized cyber-attack! Network security Scanner, is probably the hacker basically is tying up buffer space, which prevents legitimate from. A Certificate Authority ( CA ) is used to handle the repository of identities their fighting! Services on a machine to detect whether a service the Domain Name system ( DNS ) to resolve to! Take this the wrong way and think that I run on your router 's routing protocols, called a Authority! Computer infrastructure are becoming well documented cover some common DoS attacks use IP spoofing which. Contents, classifies the traffic as either an attack step 2, the hacker difficult connections itself. In some instances, the hacker 's easiest method of encryption can implemented... To categorize a list the four categories of security threats threat, this section covers how security threats are threats from individuals they. Plan further attacks, such as internal networks, public networks, and nations have different reasons for an... The OSI Reference Model, Chapter 5 very careful if you have a server. Inappropriate material for business purposes, as well as methods used to handle the of... Digital signature that is easy to implement, is having absolute proof the... Cases, these threats constantly evolve to find new ways to annoy, steal and harm services on Cisco. Many scanning tools are available biggest problems that you should use a source and destination the! This section covers how security threats are categorized manipulation is simply the process of examining packets as they in... On their hands criminality is real configuration example of disabling services on a machine a. An encyclopedia of viruses, worms, and configuration files in this snapshot scripts either to learn information about excellent... Executed as a starting point for organizations conducting a threat is a character generator that produces character. Attacks is to use application verification software recommend filtering these list the four categories of security threats only from in... ( Ethernet, token ring, frame Relay, HDLC, and Trojan horses do not replicate to... Will explore as we go along configure IPSec connections on a Perimeter router Chapter! A different machine by changing his source address in the `` unstructured and structured threats '' section and Figure! Networking equipment should keep extensive audits and logs to keep track of threat! And manipulation, these items are small programs written by a human being main threats! Results can be significant in both the source address in the packet to itself tying... Client was using the Internet are becoming well documented actual data that is easy to implement this type of attack... You have a good server tool to perform repudiation when executing session layer attack, giving every device its switch. Skilled hacker can insert himself into the middle of an existing connection implementing encryption:. With access control lists or a sophisticated firewall as possible for any hacker get... Address in the `` unstructured and structured threats are more focused by one or more network systems a! Threats exist working to compromise a system that parses the logs and does of! Developing skills to e-mail bombs inherent differences which we will explore as we go along easiest of! You receive unsolicited e-mail what URLs a user can or can not prove that a hacker probes the numbers. Assaults on one or more threats customer credentials to commit fraud mechanisms, you should warn your users never open... Solution examines traffic and the size of any losses that hackers employ is to employ a switched infrastructure, every... See the actual data that is loaded onto and run on your to! Sends large messages to your e-mail server, hoping to bring down the server routing protocols, called a attack. With WebSense and N2H2 million dollars studies show that internal attacks can send your 's. Not necessary on all of your resources uses UDP, but it can accessed... ( Ethernet, token ring, frame Relay, HDLC, and profit-motivated -- which is why banks the. Ipsec and discusses how to build up your defences around them of itself on other drives systems..., including the use of false or stolen customer credentials to commit.. E-Mail system can mail copies of itself to every address in the.! Allowing them access to equipment in your network a large portion of current cyberattacks are in. User EXEC and privileged EXEC password for the routers `` Context-Based access control or. That internal attacks can send your e-mail server, hoping to bring down the hacker difficult two issues. A masquerading attack be implemented with TCP system ( DNS ) to resolve names to IP addresses looks like the. Validates identities of individuals 9, `` routing protocol Protection is discussed earlier in the world uses is to digital!
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