Dom Based Xss Attack

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Any page that uses uri fragments is potentially at risk from xss attacks. In reflective and stored cross site scripting attacks you can see the vulnerability payload in the response page but in dom based cross site scripting the html source code and response of the attack will be exactly the same i e.

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Read about other types of cross site scripting attacks.

Dom based xss attack. There is a third much less well known type of xss attack called dom based xss that is discussed separately here. Dom xss stands for document object model based cross site scripting. An attacker can execute a dom based cross site scripting attack if the web application writes user supplied information directly to the document object model dom and there is no sanitization.

Dom based xss attacks have all the risks associated with the other types of xss attack with the added bonus that they are impossible to detect from the server side. Dom based xss or as it is called in some texts type 0 xss is an xss attack wherein the attack payload is executed as a result of modifying the dom environment in the victim s browser used by the original client side script so that the client side code runs in an unexpected manner. Want to see this vulnerability in action.

That is the page itself the http response that is does not change but the client side code contained in the page executes differently due to the malicious modifications that have. The attacker can manipulate this data to include xss content on the web page for example malicious javascript code. A dom based xss vulnerability arises when the dom is used to generate dynamic content containing user input that can be processed without checking.

Dom based xss is extremely difficult to mitigate against because of its large attack surface and lack of standardization across browsers. This kind of attack is carried out with javascript in the user s browser. The guidelines below are an attempt to provide guidelines for developers when developing web based javascript applications web 2 0 such that they can avoid xss.

Dom based cross site scripting dom xss is a web vulnerability a subtype of cross site scripting. Stored xss attacks stored attacks are those where the injected script is permanently stored on the target servers such as in a database in a message forum visitor log comment field etc. A dom based xss attack is possible if the web application writes data to the document object model without proper sanitization.

This kind of xss attack occurs when an application receives some client side javascript that processes data from an unsafe or untrusted source by writing the data to a potentially dangerous sink within the dom instead of writing data in html which would present a regular xss. Here the locations that malicious user input bring into the dom are designated as source. Dom based xss simply means a cross site scripting vulnerability that appears in the dom document object model instead of part of the html.

The payload cannot be found in the response. Dom based xss vulnerabilities usually arise when javascript takes data from an attacker controllable source such as the url and passes it to a sink that supports dynamic code execution such as eval or innerhtml. This enables attackers to execute malicious javascript which typically allows them to hijack other users accounts.

The document object model is a convention used to represent and work with objects in an html document as well as in other document types.

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