Computer emergency response teams are set up by government and large organization to handle computer security incidents.
Such internet data packets carry the sender's IP address as well as application-layer data. If the attacker obtains control over the software software running on a network device, they can then easily modify the device's protocols to place an arbitrary IP address into the data packet's source address field.
This is known as IP spoofing, which makes any payload appear to come from any source.
Networks are always susceptible to unauthorized monitoring and different types of network attacks. If you have not implemented proper security measures and controls in your network, there is a chance for network attacks from inside and outside your network. A computer network attack disrupts the integrity or authenticity of data, usually through malicious code that alters program logic that controls data, leading to errors in output. Types of attack attacks can be concentrated on network mechanisms or host features. Network Attack Types There are 2 types of attacks in general, either they are passive, meaning information is being screened and monitored ; other attacks are active, which means that the information is altered with the intent to modify or destroy the data or the network itself.
With a spoofed source IP address on a datagram, it is difficult to find the host that actually sent the datagram. The countermeasure for spoofing is ingress filtering. Routers usually perform this. Routers that perform ingress filtering check the IP address of incoming datagrams and determine whether the source addresses that are known to be reachable via that interface.
If the source addresses that are known to be reachable via that interface. If the source address is not in the valid range, then such packets will be discarded.
Sniffing Packet sniffing is the interception of data packets traversing a network. A sniffer program works at the Ethernet layer in combination with network interface cards NIC to capture all traffic traveling to and from internet host site. Further, if any of the Ethernet NIC cards are in promiscuous mode, the sniffer program will pick up all communication packets floating by anywhere near the internet host site.
A sniffer placed on any backbone device, inter-network link or network aggregation point will therefore be able to monitor a whole lot of traffic. Most of packet sniffers are passive and they listen all data link layer frames passing by the device's network interface.
There are dozens of freely available packet sniffer programs on the internet. The more sophisticated ones allow more active intrusion. The key to detecting packet sniffing is to detect network interfaces that are running in promiscuous mode.
Sniffing can be detected two ways: Software commands exist that can be run on individual host machines to tell if the NIC is running in promiscuous mode. Solutions tend to check for the presence of running processes and log files, which sniffer programs consume a lot of. However, sophisticated intruders almost always hide their tracks by disguising the process and cleaning up the log files.
The best countermeasure against sniffing is end-to-end or user-to-user encryption. Mapping Eavesdropping Before attacking a network, attackers would like to know the IP address of machines on the network, the operating systems they use, and the services that they offer.
With this information, their attacks can be more focused and are less likely to cause alarm. The process of gathering this information is known as mapping.
In general, the majority of network communications occur in an unsecured or "clear text" format, which allows an attacker who has gained access to data paths in your network to "listen in" or interpret the traffic.
When an attacker is eavesdropping on your communications, it is referred to as sniffing or snooping. The ability of an eavesdropper to monitor the network is generally the biggest security problem that administrators face in an enterprise.
Counter measures are strong encryption services that are based on cryptography only. Otherwise your data can be read by others as it traverses the network. Hijacking occurs when someone between you and the person with whom you are communicating is actively monitoring, capturing, and controlling your communication transparently.
For example, the attacker can re-route a data exchange.
When computers are communicating at low levels of the network layer, the computers might not be able to determine with whom they are exchanging data.
Man-in-middle attacks are like someone assuming your identity in order to read your message. The person on the other end might believe it is you, because the attacker might be actively replying as you, to keep the exchange going and gain more information.
Trojans These are programs that look like ordinary software, but actually perform unintended or malicious actions behind the scenes when launched.
Most remote control spyware programs are of this type. The number of trojan techniques are only limited by the attacker's imagination. A torjanizes file will look, operate, and appear to be the same size as the compromised system file. The only protection is early use of a cryptographic checksum or binary digital signature procedure.These attacks attempt to penetrate a network by using wireless or evading WLAN access control measures, like AP MAC filters and X port access controls.
Type of Attack Description. Top 7 types of network attacks Denial of service attacks – 37% A denial of service (DOS) attack attempts to make a resource, such as a web server, unavailable to users.
DoS (Denial of Service attacks): DOS Attack is a type of attack to a network server with large number or service requests with it cannot handle. DoS (Denial of Service Attack) can causes the server to crash the server and legitimate users are denied the service. A computer network attack disrupts the integrity or authenticity of data, usually through malicious code that alters program logic that controls data, leading to errors in output.
Types of attack attacks can be concentrated on network mechanisms or host features. A reconnaissance attack, as the name implies, is the efforts of an unauthorized user to gain as much information about the network as possible before launching other more serious types of attacks.
Quite often, the reconnaissance attack is implemented by using readily available information. Types of Wireless Network Attacks. Types of Wireless Attacks.
Wireless Attacks can come at you through different methods. For the most part you need to worry about WiFi.
Some methods rely on tricking users, others use brute force, and some look for people who don’t bother to secure their network.