moncler size chart Intrusion Detection

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Intrusion Detection (Intrusion Detection), the name suggests, is found on the invasion behavior. He passed on the computer network or computer system to collect information on some key points and analyzed, and found the network or system security policy is a violation of the behavior and signs of attack.
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Introduction to the classification of basic feature detection anomaly detection work steps common terms AlertsAnomalyApplianceArachNIDSAttacksAutomated ResponseCERTCIDFCIRTCISLCVECrafting PacketsDesynchronizationEleetEnumerationEvasionExp loitsFalse NegativesFIRSTFragmentationHeuristicsHoneynet ProjectHoneypotIDS CategoriesIDWGIncident HandlingIncident ResponseIslandingPromiscuousScannersScript KiddiesShunningSignaturesStealth information collection 1. System and network log files 2. Directories and files do not expected to change 3. program is being run is not expected behavior 4. the physical form of invasion of pattern matching information signal integrity analysis detection statistical analysis of the development process of intrusion detection model for the development of the concept put forward the basic profile and technological progress Intrusion Detection (Intrusion Detection ) is an intrusion detection. It is through the collection and analysis of network behavior, security logs, intrusion detection audit
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data and other information available on the network and computer systems in a number of key points of information, check whether the network or system violation of security policy behavior and signs of attack. Intrusion detection as a proactive security protection technology, provides internal attacks and external attacks and misuse of the real-time protection, endangered in the network system to intercept and respond before the invasion. Therefore considered to be the firewall after the second security gate, without prejudice to the case of network performance monitoring network. Intrusion detection achieved by performing the following tasks: monitoring, analysis of user and system activities; system construction and weaknesses of the audit; identify known attack patterns of activity reflects the relevant person to the police; statistical analysis of abnormal behavior; evaluate critical systems and data integrity of the document; operating system audit trail management, and identify users who violate security policy behavior. Firewall, intrusion detection is a reasonable supplement to help the system to deal with cyber attacks, expands the ability of the system administrator's security management (including safety audit, monitoring, attack recognition and response), improve the integrity of the information security infrastructure. It from the computer network system in a number of key points to collect information and analyze this information to see if there are violations of network security policy behavior and signs of an attack. Firewall, intrusion detection is a reasonable supplement to help the system to deal with cyber attacks, expands the ability of the system administrator's security management (including safety audit, monitoring, attack recognition and response), improve the integrity of the information security infrastructure. It from the computer network system in the number of key points to collect information and analyze this information, Kankan network security policy is a violation of the behavior and signs of being attacked. Firewall, intrusion detection is considered to be after the second security gate, without prejudice to the case of network performance monitoring network, which provides internal attacks and external attacks and misuse of the real-time protection. The following tasks through which to achieve: * Monitor, analyze user and system activities; ? System structure and weaknesses of the audit; * identify known attack patterns of activity reflects the relevant person to the police; * Statistical analysis of abnormal behavior; * assessment of critical systems and data integrity of the document; * operating system audit trail management, and identify users who violate security policy behavior. Of a successful intrusion detection system is concerned, it not only enables system administrators always know the network system (including programs, files and hardware devices, etc.) of any changes to the network can provide guidance for the formulation of security policy. More important point is that it should be management, configuration is simple, so easy access to non-professional network security. Moreover, the scale of intrusion detection should be based on network threats and security needs of system configuration is changed. Intrusion detection system is found after the invasion, will respond in a timely manner, including the cut off network connections, recording the event and alarm. Classification of intrusion detection technology used in the system can be divided into two kinds of feature detection and anomaly detection. Feature detection feature detection (Signature-based detection), also known as Misuse detection, the intruder detection activities can be assumed to represent a model system the main objective is to test whether the activities conform to these patterns. It can be invasive method to check out the existing, but new intrusion methods are useless. The difficulty lies in how to design models to express both the Anomaly detection anomaly detection (Anomaly detection) the assumption that the intruder activities, the main exception to normal activities. According to this concept of the normal activities of the establishment of the main Anomaly detection problem is how to create Work steps to a successful intrusion detection system is concerned, it not only enables system administrators always know the network system (including programs, files and hardware devices, etc.) of any changes to the network security policy can provide guidelines for the formulation. More important point is that it should be management, configuration is simple, so easy access to non-professional network security. Moreover, the scale of intrusion detection should be based on network threats and security needs of system configuration is changed. Intrusion detection system is found after the invasion, will respond in a timely manner, including the cut off network connections, recording the event and alarm. Common terms with the IDS (Intrusion Detection System) is speeding the development of the terminology associated with the rapid evolution of the same. This article shows you some IDS technical terms, some of which are very basic and relatively common, some rare and others. As the rapid development and a number of IDS IDS manufacturer market power, different manufacturers may use the same term for different significance, leading to the precise meaning of certain terms out of whack. In this regard, this paper will attempt to include all the terms are entered. Alerts (alert) when an intrusion is occurring, or attempts to occur, IDS alert information system will issue a notification system administrator. If the console with the IDS system and a single machine, alert information is displayed on the monitor may also be accompanied by voice prompts. If the remote console, then the alert will be built into the system through the IDS method (usually encrypted), SNMP (Simple Network Management Protocol, is usually not encrypted), email, SMS (short message) or more of several methods of mixed mode delivery to the administrator. Anomaly (anomaly) when there is an event with a signal to match known attacks, most IDS will alarm. One based on anomaly (anomaly) of the IDS activity will then construct a rough outline of the host or network, when there is a profile in this time of the incident other than the pictures
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, IDS will alarm , for example, some people do not done before his time, for example, a user suddenly get the administrator or root permissions. Some IDS vendors use this method as heuristic function, but a heuristic reasoning in their judgments should IDS has more intelligence. Appliance (IDS hardware) in addition to those existing systems to be installed up to the IDS software, the shelves in the market can also buy some ready-IDS hardware, just that they can be used to access the network. Some of the available hardware, including IDS CaptIO, Cisco Secure IDS, OpenSnort, Dragon and SecureNetPro. ArachNIDS ArachNIDS developed by Max Visi an attack signature database, it is updated dynamically, for a variety of network-based intrusion detection system. ARIS: Attack Registry & Intelligence Service (attack up, and intelligence services) ARIS is provided SecurityFocus an additional service that allows users to anonymously connect to the Internet network to the SecurityFocus submitted on network security events, then will these SecurityFocus data with many other participants in the data, which eventually form a detailed statistical analysis of network security and Prediction, published in the network. Its URL address is. Attacks (attack) Attacks can be understood as attempting to infiltrate the system or bypass the system security policy, to obtain the information, modify information, and damage to the target network or system functional behavior. The following lists the IDS can detect the most common types of Internet attacks: attack type 1-DOS (Denial Of Service attack, denial of service attacks): DOS attack is not damaged by hacking the security of a system, it just makes the system paralyzed, so that system refused to provide services to its users. The categories include buffer overflows, through the flood (flooding) run out of system resources and so on. Attack Type 2-DDOS (Distributed Denial of Service, Distributed Denial of Service attack): a standard DOS attacks use a lot of data from a host to attack a remote host, but can not send enough packets to achieve the desired results , and therefore had a DDOS, or distributed from multiple hosts to attack a target,moncler size chart, draining resources of the remote system, or its connection failure. Attack Type 3-Smurf: This attack is an old-fashioned, but there have occurred, the attacker uses the guise of targeting a smurf amplifier to the source address, ping the broadcast address, then all activities will be to the target host response, to interrupt the network connection. Attack Type 4-Trojans (Trojan): Trojan attacks the term comes from the ancient Greeks used the Trojan Trojan, Trojan horses in the possession of the Greek soldiers, the horse shipped to the city, soldiers poured out of the city and its inhabitants to the Trojan attack. In computer terminology, it refers to those who had the form of legal process, in fact, those that harbor malware software. Thus, when the user runs legal procedures, in the knowledge of the malicious software to be installed. However, because most of this form of malicious programs are installed remote control tool, Trojan quickly evolved into the term refers specifically to such tools, such as BackOrifice, SubSeven, NetBus and so on. Automated Response (automated response) in addition to sound the alarm on the attack, some IDS can automatically resist these attacks. Diyu There are many ways: First, you can re-configure the router and firewall, reject the flow of information from the same address; Second, by sending reset packets on the network Qieduan connection. But there are problems of these two methods, an attacker could use to re-configure the device in turn, the method is: by pretending to be a friendly address to launch attacks and then IDS will configure the router and firewall to reject these addresses, so that is actually the Send a reset packet method requires an active network interface, so it will be placed under attack, a remedy is: to make the activity within the network interface in the firewall, or the use of specialized contracting procedures to avoid the standard IP stack needs . CERT (Computer Emergency Response Team, Computer Emergency Response Team) is the term reflects the first computer emergency response team selection, the team built on the Carnegie Mellon University, their computer security incident response, take action. Many organizations now have a CERT, such as CNCERT / CC (China Computer Network Emergency Coordination Center.) Some of the emergency the word unclear, many organizations have used the word to replace it with Incident, resulting in a new word Computer Incident Response Team (CIRT), namely, computer incident response team. response handling the word is sometimes used instead, which means that the emergency response action, rather than long-term research. CIDF (Common Intrusion Detection Framework; common intrusion detection framework) CIDF somehow kept the intrusion detection attempt Biaozhun Hua, develop some protocol and application programming interface, so that intrusion detection research projects can share information and resources between and intrusion detection components can also be reused in other systems. CIRT (Computer Incident Response Team, Computer Incident Response Team) CIRT evolved from CERT,ghd cheap, CIRT security event represents a change in the philosophical understanding. CERT was originally a computer specifically for a particular emergency situation, and CIRT incident indicates that the term is not necessarily all of the incidents are emergencies, and all emergencies can be seen as incidents. CISL (Common Intrusion Specification Language, Common Intrusion Specification Language) CISL is CIDF between components communicate with each other language. As CIDF standardized protocols and interfaces is on the attempt, so CISL is the study of intrusion detection attempts to standardize the language. CVE (Common Vulnerabilities and Exposures, Common Vulnerabilities and Exposures) on an old problem is the vulnerability scanner or in the design of coping strategies, the different vendors on the title of vulnerability will be completely different. Also, some of the Chamber of Commerce produced a loophole in the definition of multiple features and applications to their IDS systems, thus giving a false impression, as if their products are more effective. MITRE created CVE, will be standardized vulnerability names, participating manufacturers will naturally develop in accordance with this standard IDS products. Crafting Packets (custom data packets) to create custom packets, you can avoid some of the usual requirements for the data packet structure, thereby creating a data packet spoofing, or makes the computer receiving it do not know how to handle it. Desynchronization (synchronization failure) Desynchronization The term originally refers to the number of escape sequences IDS method. Some IDS may expect it would have been confused about the serial number, resulting in the data can not be rebuilt. This technology is very popular in 1998, is now out of date, some articles on behalf of the desynchronization the term refers to other IDS evasion method. Eleet When hackers write exploit development program, they will usually leave a signature, one of the most notorious one is the elite. If eleet into digital, it is 31337, and when it refers to their ability, elite = eleet, that elite. 31337 is often used as a port number or serial number. Currently popular term is Enumeration (cited) research and social engineering through the passive work, the attacker will start on the network resources listed. List is active attacker probing a network to discover what is and what can be made use of. Now that the action is no longer the passive, it is likely to be detected. Course, in order to avoid being detected, they will quietly as possible. Evasion (dodge) Evasion is to launch an attack, IDS successfully without being detected. The trick is to let them see only one aspect of the IDS, but the actual attack is another goal, the so-called repairing the plank road, stealing a march. Evasion is a form of information packets for different set different TTL (effective time) value, so the information through the IDS looks like a harmless bit of information in the sound than the TTL to reach the target host TTL needs to be short. Once through the IDS, and close to the target, some will be lost sound, leaving only harmful. Exploits (Exploit) For each vulnerability, there is an attack using this vulnerability mechanisms. In order to attack the system, an attacker exploit code or write textbooks. Will be there for each to exploit loopholes in the implementation of the mode of attack, this way is Exploit. In order to attack the system, the hacker will write exploits. Exploit: Zero Day Exploit (exploit zero-time) zero-day exploits is not yet understood and still running amok exploits, vulnerabilities of this type that has not been found by the current. Once an exploit is found in the network security community, and soon there will be patches for it,moncler womens, and its characteristics in the IDS identification information is written to make use of this loophole is not valid, effectively capture it. False Negatives (omitted) Omission is not an IDS detects attacks, or analysts considered harmless. False Positives (false) false positive refers to the actual sound of the event but was detected as IDS attacks. Firewalls (Firewall) is a network security firewall, the first hurdle, although it is not IDS, but the firewall logs can provide valuable information for the IDS. Working principle is based on the firewall rules or standards, such as source address, port, etc, blocking out the dangerous connection. FIRST (Forum of Incident Response and Security Teams, Incident Response and Security Team Forum) FIRST by international governmental and private organizations together to exchange information and coordinate response efforts, alliance, the annual FIRST be a high priority. Fragmentation (fragment) If a packet is too large to load, it had to be divided into fragments. Fragmentation is based on the network MTU (Maximum Transmission Units, the maximum transmission unit). For example, tablets ring (token ring) of the MTU is 4464, Ethernet (Ethernet) the MTU is 1500, so if a packet transmitted from the tablets Ring to Ethernet, it will be split into smaller fragments, and then rebuild at the destination. Although this treatment may cause reduced efficiency, but the effect of fragmentation is very good. Slice as hackers evade IDS method, in addition to a number of DOS attacks are also used Segmentation. Heuristics (inspired) Heuristics refers to the use of intrusion detection in the AI (artificial intelligence, artificial intelligence) thought. IDS using the theory of real inspiration has emerged about 10 years, but they are not enough Some of IDS to detect intrusions with abnormal patterns, such IDS must continue to learn what is normal events. Some producers think this is pretty But in fact, the real application of AI technology to IDS analysis of the input data is also very little. Honeynet Project (Honeynet Project) Honeynet is a learning tool, is a network system that contains security flaws. When it was security threat, the invasion of information will be captured and accepted analysis, so that hackers can understand some things. Honeynet is a professional organization of more than 30 security members, dedicated to the understanding of hacker groups using the tools, tactics and motives as well as sharing their knowledge of the project. They have established a series of honeypots, provides a seemingly vulnerable Honeynet network, observe the intrusion into the hacking of these systems to study the hacker tactics, motivation and behavior. Honeypot (honey pot) containing honeypot is a vulnerable system, which simulates one or more vulnerable host to the hacker provides an easy target. Since the honeypot is no need to complete other tasks, all connection attempts should be considered suspicious. Another honeypot Intrusion Detection with
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way to delay an attacker to attack their real target, allow an attacker to waste time on the honeypot. At the same time, the initial target is protected, the real value of the content will not be violated. Honeypot is one of the original purpose of gathering evidence for the prosecution of malicious hackers, it looks like a However, in some countries, can not use honeypots to collect evidence to prosecute hackers. IDS Categories (IDS classification) there are many different types of IDS, the following breakdown: IDS Category 1-Application IDS (Application IDS): IDS application for some specific applications that invasion of the signal, these applications are usually those Comparison of vulnerable applications such as Web servers, databases and so on. There are many operating systems originally focused on host-based IDS, although not for the default application, but can also be trained to used the application. For example, KSE (a host-based IDS) can tell us all going in the event log, including the event log report on the application's output. An example of an application IDS is Entercept �� Web Server Edition. IDS Category 2-Consoles IDS (console IDS): In order to apply collaborative environment IDS, distributed IDS agents will need to report information to the center console. Now many of the center console can also receive data from other sources, such as other manufacturer in IDS, firewalls, routers. This information will be integrated together, they can reveal a more complete picture of the attack. Some Kongzhi Tai Hai Jiang added their own signatures to the agency-level console, and provide remote management capabilities. The IDS product Intellitactics Network Security Monitor and Open Esecurity Platform. IDS Category 3-File Integrity Checkers (file integrity checker): When a system's threat of an attack, it often will change some of the key documents to provide continuous access and prevent detection. Additional information for the key documents through summaries (encrypted hash), you can periodically check the file to see if they are to be changed, so in a way provide a guarantee. Once such a change is detected, the integrity checker will send out a warning. Moreover, when a system has been under attack, the system administrators can also use the same method to determine the extent of the system at risk. File Checker before the incident occurred only after a long time out of the intrusion detection is These products are Tripwire and Intact. IDS Category 4-Honeypots (honeypots): on the honeypot, as already introduced. Examples of the honeypot Mantrap �� Sting. IDS Category 5-Host-based IDS (host-based IDS): IDS on a variety of sources of such a system and event log monitoring, suspicious activity. Host-based IDS, also known host IDS, most suitable for the detection of internal staff who can be trusted and has to avoid the misuse of traditional detection methods to infiltrate the network activities. In addition to completing a similar function of the event log viewer, host IDS is also on the Many products also contain a heuristic function. Host IDS is almost time for work, system errors can be detected quickly, technical staff and security people are very fond of it. Now, host-based IDS is that based on server / workstation all types of host intrusion detection system. These products include Kane Secure Enterprise and Dragon Squire. IDS Category 6-Hybrid IDS (Hybrid IDS): The structure of modern switched networks to intrusion detection operation caused some problems. First, the default state of the switching network card in promiscuous mode is not allowed, which makes the installation of traditional network IDS is very difficult. Second, the high speed of the network means that many packets will be discarded by NIDS. Hybrid IDS (Hybrid IDS) is a program to solve these problems, it will IDS to the next level, the combination of a network node IDS and Host IDS (host IDS). Although the coverage of this solution is great, but taking into account the resulting huge amount of data and costs. Many network servers only for the very critical reserves the hybrid IDS. Some manufacturers of more than one task to complete the IDS are called Hybrid IDS, in fact it is only for advertising effects. Hybrid IDS products are CentraxICE and RealSecure Server Sensor. IDS Category 7-Network IDS (NIDS, Network IDS): NIDS through monitoring agent for all network traffic monitor suspicious activities and unusual features include activities to respond to attacks. NIDS filter was originally mixed with IDS packet sniffer, but recently they have become more intelligent, you can decipher the agreement and to maintain state. NIDS application-based products exist, only need to install can be applied to the host. NIDS attack on the characteristics of each information packet analysis, but under high load in the network, or to discard some packets. Network IDS products are SecureNetPro and Snort. IDS Category 8-Network Node IDS (NNIDS, network node IDS): Some network IDS are unreliable at high speed, the load will be discarded after a high proportion of their network information packets, and exchange network that often hinder the network IDS Mixed packet sent. NNIDS the NIDS function entrusted to a single host, thus alleviating the problem of high speed and exchange. Although NNIDS and personal firewall features are similar, but there are differences between them. To be classified as NNIDS personal firewall, an attempt should be made of the connection. For example, unlike many personal firewall found in the In addition, NNIDS will host the event received is sent to a central console. NNIDS products BlackICE Agent and Tiny CMDS. IDS Category 9-Personal Firewall (Personal Firewall): personal firewall installed on separate systems, to prevent unwanted connections, either incoming or out to protect the host system. Be careful not to confuse it with NNIDS. There ZoneAlarm Personal Firewall and Sybergen. IDS Category 10-Target-Based IDS (target-based IDS): This is not a clear one IDS terminology, different people have different meanings. A possible definition file integrity checker, while the other is the definition of the network IDS, which is only for those who are looking for protection of the vulnerable and the attacks carried out by the network characteristics. The purpose behind this definition is to improve the speed of IDS because it does not search for those unnecessary attacks. IDWG (Intrusion Detection Working Group, Intrusion Detection Working Group) Intrusion Detection Working Group's goal is to define data formats and procedural steps to exchange information, this information is for intrusion detection systems, response systems, and those who need to interact with their management systems has important significance. Intrusion Detection Working Group organization and coordination with other IETF work. Incident Handling (event handling) detected an intrusion is just the beginning. More generally, the console operator will continue to receive the alert, because personally can not separate the time to track every potential incident, the operator will make a mark on the event of interest to prepare for the future by the Response Team to investigation. After the initial reaction, we need to deal with the incident, that is, such as surveys, debates and prosecution of the class issues. Incident Response (incident response) to detect the initial response of potential events, then these events should be handled according to the procedures for processing the event. Islanding (island) island is the network is completely cut off from the Internet, which is almost a last resort, and there is no way of approach. An organization only in the large-scale virus outbreak or attack by the very obvious security when using this means. Promiscuous (promiscuous mode) By default, IDS host network interface can only see out of the information, that is, the so-called non-promiscuous (non-promiscuous mode). If the network interface is in promiscuous mode, you can see all of the segment network traffic, regardless of its origin or destination. This is necessary for network IDS, but may be used by packet sniffers to monitor network traffic. Exchange-based HUB can solve this problem, see a comprehensive traffic in place, will have a lot of over (span) port. Routers (router) routers are used to connect different subnet hub, they work in the OSI 7 layer model of the transport layer and network layer. Router's basic function is to transmit the network packets to their destination. There are a number of router access control lists (ACLs), allows packet filtering unwanted information out. Many routers can log information will be injected into their IDS system to provide network access attempts blocked the valuable information. Scanners (scanner) scanner is an automated tool, it scans the network and host vulnerabilities. With intrusion detection systems, they are also divided into many types, the following were described. Scanner Type 1-Network Scanners (network scanner): network scanner on the network search to find all the hosts on the network. They use the traditional ICMP ping technology, but this approach can easily be detected. In order to become hidden, there are some new technologies such as scanning and fin ack scan. More subtle use of these scanners is another advantage: different operating systems have different reactions of these scans, which provide an attacker with more valuable information. An example of such a tool is nmap. Scanner Type 2-Network Vulnerability Scanners (network vulnerability scanner): Network vulnerability scanners will be a step forward network scanner that can detect the target host, and highlight all the hackers can exploit. Network vulnerability scanner for attackers and security experts to use, but will allow IDS systems often Retina of such products and CyberCop. Scanner Type 3-Host Vulnerability Scanners (host vulnerability scanner): such tools as a privileged user, from the internal scan host, password strength testing, security policy and file permissions and so on. Network IDS, Host IDS particular it can be detected. These products are SecurityExpressions, it is a remote Windows vulnerability scanners, and can automatically fix vulnerabilities. Also, as ISS database scanner, will scan the database for the vulnerability. Script Kiddies (script kiddies) are trumpeted some of the Internet security breaches, such as the February 2000 denial of service attacks on Yahoo, some ten-year-old high school students doing, they aim to do these bad things seem to fame. Security experts often to these people as script kiddies (Script Kiddies). Script kiddies are usually some spontaneous, less skilled cracker, they use the information downloaded from the Internet, software or scripts on the target site of destruction. Hackers or law enforcement authorities have a child to express contempt for the scripts, because they are usually unskilled, the hands have a lot of time to carry out his sabotage, their purpose generally is to impress their friends. Script kiddies is like a hand grab the kids, they do not know how to ballistic theory, there is no need to manufacture firearms, can become a powerful enemy. Therefore, whenever they can not underestimate the strength. Shunning (escape) to avoid the border device is configured to deny all unwanted packets, and some even refuse to escape all the IP addresses from certain countries, the information packets. Signatures (feature) IDS is the core of signatures, which allows IDS is triggered when the event occurs. Feature information is too short will often trigger the IDS, lead to false positives or false reporting, excessive speed will slow down the work of IDS. Some features will be supported by the number of IDS IDS as a standard of good or bad, but a feature of some of commercially available products include many attacks, and some manufacturers of these features will be listed separately, which would give the impression, as if It contains more features, a better IDS. We must be aware of these. Stealth (hidden) hidden in the detection of attacks is the IDS does not see the outside world, they often use outside in the DMZ, not behind a firewall. It has some disadvantages, such as automatic response. The first step in information gathering intrusion detection, information collection, including systems, network, data and user activity in the state and behavior. Moreover, the need for computer network systems in a number of different critical points (in different segments and different host) to collect information, which in addition to maximizing the detection range of factors, there is an important factor is the information from a source may be do not see the doubt, but several inconsistencies in the information source to suspicious behavior or invasion is the best logo. Of course, the intrusion detection relies heavily on the reliability and validity of information collected, therefore,moncler ski pants for men, it is necessary to know only the use of real and accurate software to report this information. Because hackers often confused and replaced by software to remove the information, for example, replacement by programs called subroutines, libraries and other tools. Hackers to modify the system could malfunction and the system looks the same as with normal, but actually is not. For example, unix system PS instructions can be replaced with a non-invasive procedure shows the command, or the editor to be replaced with a reading different from the specified file (hacker hides the first test file and replaced with another version.)