The Attack (With Active Table of Contents)

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Writing code in comment? Please use ide. Types of active attacks are as following: Masquerade — Masquerade attack takes place when one entity pretends to be different entity. A Masquerade attack involves one of the other form of active attacks. Modification of messages — It means that some portion of a message is altered or that message is delayed or reordered to produce an unauthorised effect.

Repudiation — This attack is done by either sender or receiver. You can filter lists of attack signatures by these attack types. The following table describes the attack signature properties, listed on the Attack Signature Properties screen, that you can view for more information about the signatures in the pool. You can create attack signature sets in two ways: by using a filter or by manually selecting the signatures to include. Filter-based signature sets are based solely on criteria you define in the signatures filter. The advantage to filter-based signature sets is that you can focus on the criteria that define the attack signatures you are interested in, rather than trying to manage a specific list of attack signatures.

Another advantage to filter-based sets is that when you update the attack signatures database, the system also updates any signature sets affected by the update.

When manually creating a signature set, you must select each of the signatures to include from the signature pool. To simplify using this method, you can still filter the signatures first, then select the individual signatures from the filtered list. Once you create the attack signature sets that you need, you can assign them to security policies.

An attack signature set is a group of attack signatures.

What is an input validation attack?

Rather than applying individual attack signatures to a security policy, you can apply one or more attack signature sets. The Application Security Manager ships with several system-supplied signature sets. Each security policy has its own attack signature set assignments. By default, a generic signature set is assigned to new security policies.

You can assign additional signature sets to the security policy.

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Certain sets are more applicable to certain types of applications or types of attack. The sets are named logically so you can tell which ones to choose. Additionally, you can create your own attack signature sets. What happens depends on the blocking policy options you selected. If you selected Learn , the security policy learns all requests that match enabled signatures included in the signature set, and displays the request data on the Traffic Learning Attack Signature Detected screen.

If Alarm is selected, the security policy logs the request data if a request matches a signature in the signature set. If you selected Block , and the enforcement mode is Blocking , the security policy blocks all requests that match a signature included in the signature set, and sends the client a support ID number.

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When signature staging is enabled, the system places all new or updated signatures in staging for the number of days specified in the enforcement readiness period. The system does not enforce signatures that are in staging, even if it detects a violation. Instead, the system records the request information. If staging is disabled, attack signatures are not put into staging before they are enforced, regardless of the staging configuration for each individual signature. The system enforces the Learn , Alarm , and Block settings for each signature immediately. The system includes an attack signatures pool from which you can select signatures to include in any security policy.

The pool includes the system-supplied attack signatures, which are the attack signatures that are shipped with the Application Security Manager, and any user-defined attack signatures. F5 develops new attack signatures to handle the latest attacks, and you can schedule periodic updates to the attack signatures pool, or update it manually. You can have the system send you an email when an update to the attack signature pool is available.

The Application Security Manager records details about the most recent update activity, and displays this information on the Attack Signatures Update screen. There you can review the last update time as well as the readme file that pertains to the update. User-defined attack signatures are those that your organization creates and adds to the attack signature pool. User-defined attack signatures must adhere to a specific rule syntax.

They are never updated by F5 Networks. All user-defined signatures are carried forward as-is when the system is updated to a new software version. You can develop user-defined attack signatures if needed for specific purposes in your environment. You can also export and import user-defined signatures to and from other Application Security Manager systems.

The XML file format is the only accepted import format for attack signatures.

Policy Brief Series

Following is an example of the XML format used when saving user-defined attack signatures for import onto another system. My Support.

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Manual Chapter : Working with Attack Signatures. About attack signatures Attack signatures are rules or patterns that identify attacks or classes of attacks on a web application and its components. About attack signature staging When you first activate a security policy, the system puts the attack signatures into staging if staging is enabled for the security policy. Types of attacks that attack signatures detect Attack signatures in a security policy are compared with requests or responses to attempt to identify classes of attacks, for example, SQL injection, command injection, cross-site scripting, and directory traversal.

Authorization attacks target a web site's method of determining if a user, service, or application has the necessary permissions to perform a requested action. Buffer Overflow Alters the flow on an application by overwriting parts of memory. An attacker could trigger a buffer overflow by sending a large amount of unexpected data to a vulnerable component of the web server. Command Execution Occurs when an attacker manipulates the data in a user-input field, by submitting commands that could alter the web page content or web application by running a shell command on a remote server to reveal sensitive data-for example, a list of users on a server.

Cross-site Scripting XSS Forces a web site to echo attacker-supplied executable code, which loads in a user's browser. Denial of Service Overwhelms system resources to prevent a web site from serving normal user activity. Detection Evasion Attempts to disguise or hide an attack to avoid detection by an attack signature. Directory Indexing Involves a web server function that lists all of the files within a requested directory if the normal base file is not present.

Information Leakage Occurs when a web site reveals sensitive data, such as developer comments or error messages, which may aid an attacker in exploiting the system. Non-browser Client Relates to an attempt by automated client access to obtain sensitive information. HTML comments, error messages, source code, or accessible files may contain sensitive information.

Other Application Attacks Represents attacks that do not fit into the more explicit attack classifications, including email injection, HTTP header injection, attempts to access local files, potential worm attacks, CDATA injection, and session fixation. Path Traversal Forces access to files, directories, and commands that potentially reside outside the web document root directory. Predictable Resource Location Attempts to uncover hidden web site content and functionality.

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Remote File Include Occurs as a result of unclassified application attacks such as when applications use parameters to pass URLs between pages. Server Side Code Injection Attempts to exploit the server and allow an attacker to send code to a web application, which the web server runs locally.

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For example, an attacker may include an attack in an email or Microsoft Word document, and when a user opens the email or document, the attack starts. Vulnerability Scan Uses an automated security program to probe a web application for software vulnerabilities. XPath Injection Occurs when an attempt is made to inject XPath queries into the vulnerable web application.

Attack signature properties The following table describes the attack signature properties, listed on the Attack Signature Properties screen, that you can view for more information about the signatures in the pool. Property Description Name Displays the signature name. ID Specifies the signature number automatically provided by the system. Signature Type Specifies whether the signatures are for all traffic, for requests only, or for responses only. Attack Type Forces a web site to echo attacker-supplied executable code, which loads in a user's browser. Systems Displays which systems for example, web applications, web server databases, or application frameworks the signature or set protects.

Accuracy Indicates the ability of the attack signature to identify the attack including susceptibility to false-positive alarms: Low : Indicates a high likelihood of false positives. Medium : Indicates some likelihood of false positives.