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A CSRF attack works because browser requests automatically include any credentials associated with the site, such as the user's session cookie, IP address, etc. Therefore, if the user is authenticated to the site, the site cannot distinguish between the forged or legitimate request sent by the victim.
The impact of a successful CSRF attack is limited to the capabilities exposed by the vulnerable application. Impacts of successful CSRF exploits vary greatly based on the privileges of each victim.
When targeting a normal user, a successful CSRF attack can compromise end-user data and their associated functions.
If the targeted end user is an administrator account, a CSRF attack can compromise the entire web application. The task then executes with or without the user's knowledge, either directly or by using a Cross-Site Scripting flaw. For example, see Samy MySpace Worm. However, any cross-site scripting vulnerability can be used to defeat all CSRF mitigation techniques available in the market today except mitigation techniques that involve user interaction and described later in this cheatsheet.
This is because an XSS payload can simply read any page on the site using an XMLHttpRequest direct DOM access can be done, if on same page and obtain the generated token from the response, and include that token with a forged request. If for any reason you violate, you would also need to protect those resources, which is mostly achieved with default form tag [GET method], href, and src attributes.
As a defense-in-depth measure, consider implementing one mitigation from Defense in Depth Mitigations section you can choose the mitigation that fits your ecosystem considering the issues mentioned under them. These defense-in-depth mitigation techniques are not recommended to be used by themselves without token based mitigation for mitigating CSRF in your applications.
You can select any algorithm per your organizational needs. Strict key rotation and token lifetime policies should be maintained. Policies can be set according to your organizational needs.
Synchronizer Token Pattern Any state changing operation requires a secure random token e. A CSRF token should be unique per user session, large random value, and also generated by a cryptographically secure random number generator.
The server rejects the requested action if the CSRF token fails validation. In order to facilitate a "transparent but visible" CSRF solution, developers are encouraged to adopt a pattern similar to Synchronizer Token Pattern The original intention of this synchronizer token pattern was to detect duplicate submissions in forms.
The synchronizer token pattern requires the generation of random "challenge" tokens that are associated with the user's current session.
These challenge tokens are then inserted within the HTML forms and calls associated with sensitive server-side operations. It is the responsibility of the server application to verify the existence and correctness of this token.
By including a challenge token with each request, the developer has a strong control to verify that the user actually intended to submit the desired requests. Inclusion of a required security token in HTTP requests associated with sensitive business functions helps mitigate CSRF attacks as successful exploitation assumes the attacker knows the randomly generated token for the target victim's session.
This is analogous to the attacker being able to guess the target victim's session identifier. The following describes a general approach to incorporate challenge tokens within the request. The value of this token must be randomly generated such that it cannot be guessed by an attacker. Consider leveraging the java.
SecureRandom class for Java applications to generate a sufficiently long random token. Alternative generation algorithms include the use of bit BASE64 encoded hashes.
Developers that choose this generation algorithm must make sure that there is randomness and uniqueness utilized in the data that is hashed to generate the random token.
After initial generation of this token, the value is stored in the session and is used for each subsequent request until the session expires. When a request is issued by the end-user, the server-side component must verify the existence and validity of the token in the request compared to the token found in the user session.
If the token was not found within the request, or the value provided does not match the value within the user session, then the request should be aborted, and the event logged as a potential CSRF attack in progress. Implementing this approach results in the generation of per-request tokens as opposed to per-session tokens.
This is more secure than per-session tokens as the time range for an attacker to exploit the stolen tokens is minimal. However, this may result in usability concerns. For example, the "Back" button browser capability is often hindered as the previous page may contain a token that is no longer valid.
Interaction with this previous page will result in a CSRF false positive security event at the server.
Few applications that need high security typically implement this approach such as banks. You have to check what suits your needs. Regardless of the approach taken, developers are encouraged to protect the CSRF token the same way they protect authenticated session identifiers, such as the use of TLS.
Existing Synchronizer Implementations Synchronizer token defenses have been built into many frameworks, so we strongly recommend using them first when they are available.Setting Name.
Impact. Port. Default: You can set a different port for AJP communication. Server. Default: localhost. If the Apache Tomcat server is located on a different server you can set the server IP or DNS name here.
Sep 11, · Web Authentication, Session Management, and Access Control. A web session is a sequence of network HTTP request and response transactions associated to . Introduction. This article is next in the series of articles about Java Servlet Session management. In this article we will learn about maintaining the client state or session by using URL Rewriting in a Servlet.
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Sep 09, · Cookies can be used to maintain a session state. This identifies a user whilst in the middle of using the application.
Session IDs are a popular method of identifying a user. A "secure" session ID should be at least bits in length and sufficiently random. Cookies can also be used to identify a.
Session object, cookie in Java servlets vs attheheels.com Ask Question. Java EE Containers default session management is using cookies (although it supports other methods, like URL rewriting).
The server can maintain a session in many ways such as using cookies or rewriting URLs.