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would indicate this packet was likely created by a potential attacker for a specific purpose, such as to crash the targeted system Matching the characters to: decode in the header of an e-mail message On certain older versions of sendmail, sending an e-mail message to decode would cause the system to execute the contents of the e-mail Context-based signatures are generally more complicated, as they are designed to match large patterns of activity and examine how certain types of activity fit into the other activities going on around them Context signatures generally address the question How does this event compare to other events that have already happened or might happen in the near future Context-based signatures are more difficult to analyze and take more resources to match, as the IDS must be able to remember past events to match certain context signatures Here are some examples of context-based signatures: Match a potential intruder scanning for open web servers on a specific network A potential intruder may use a port scanner to look for any systems accepting connections on port 80 To match this signature, the IDS must analyze all attempted connections to port 80 and then be able to determine which connection attempts are coming from the same source but are going to multiple, different destinations Identify a Nessus scan Nessus is an open-source vulnerability scanner that allows security administrators (and potential attackers) to quickly examine systems for vulnerabilities Depending on the tests chosen, Nessus will typically perform the tests in a certain order, one after the other To be able to determine the presence of a Nessus scan, the IDS must know which tests Nessus runs as well as the typical order in which the tests are run Identify a ping flood attack A single ICMP packet on its own is generally regarded as harmless, certainly not worthy of an IDS signature Yet thousands of ICMP packets coming to a single system in a short period of time can have a devastating effect on the receiving system By flooding a system with thousands of valid ICMP packets, an attacker can keep a target system so busy it doesn t have time to do anything else a very effective denial-of-service attack To identify a ping flood, the IDS must recognize each ICMP packet and keep track of how many ICMP packets different systems have received in the recent past EXAM TIP Know the differences between content-based and context-based signatures Content-based signatures match specific content such as a certain string or series of characters (matching the string /etc/passwd in an FTP session) Context-based signatures match a pattern of activity based on the other activity around it (such as a port scan) To function, the IDS must have a decent signature base with examples of known, undesirable activity that it can use when analyzing traffic or events Any time an IDS matches current events against a signature, the IDS could be considered successful, as it.

You then assign types of packets to this class using the match command, which can be used to match packets based on protocol used, input interface (the interface on which the packet arrives), IP precedence, and access lists (discussed in 27) You choose which criteria to base the match on by using different targets in the match command Table 21-2 describes the common targets for the match command, with further explanations following the table Note You can match a class map using only one match command For instance, if you enter match access-group 1 and then enter match protocol ip, the only command that will be used is the last one typed, in this case, match protocol ip Therefore, most match commands are configured to use access lists, because each access list can be configured to match multiple items For more information on access lists, please refer to 27 The match access-group command can match packets based on specific (already configured) named or numbered access lists To use this command, from class map config mode, type the command followed by the appropriate named or numbered access list (For named access lists, you must specify the name subtarget) For instance, the following configuration matches packets based on access list 50:

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And the following command matches packets based on named access list "executives":

has correctly matched the current event against a known signature and reacted accordingly (usually with an alarm or alert of some type)

Table 21-2: Commonmatch Command Targets Description Matches packets based on a named or numbered access list Matches packets based on the interface on which the packet was received

59% 60% 310% 175%

match access-group [access list number | name (access list name)] match input-interface [interface name and number]

Viewed in its simplest form, an IDS is really just looking at activity (be it host-based or network-based) and matching it against a predefined set of patterns When it matches an activity to a specific pattern, the IDS cannot know the true intent behind that activity whether or not it is benign or hostile and therefore it can react only as it has been programmed to do In most cases, this means generating an alert that must then be analyzed by a human who tries to determine the intent of the traffic from whatever information is available When an IDS matches a pattern and generates an alarm for benign traffic, meaning the traffic was not hostile and not a threat, this is called a false positive In other words, the IDS matched a pattern and raised an alarm when it didn t really need to do so Keep in mind that the IDS can only match patterns and has no ability to determine intent behind the activity, so in some ways this is an unfair label Technically, the IDS is functioning correctly by matching the pattern, but from a human standpoint this is not information the analyst needed to see, as it does not constitute a threat and does not require intervention An IDS is also limited by its signature set it can match only activity for which it has stored patterns Hostile activity that does not match an IDS signature and therefore goes undetected is called a false negative In this case, the IDS is not generating any alarms, even though it should be, giving a false sense of security

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