![]() And you can use Burp Intruder's grep payloads settings to automatically flag responses that contain the submitted value. You can use Burp Intruder's number payloads with randomly generated hex values to generate suitable random values. A random alphanumeric value of around 8 characters is normally ideal. But it needs to be long enough to make accidental matches within the response highly unlikely. The value should be designed to survive most input validation, so needs to be fairly short and contain only alphanumeric characters. For each entry point, submit a unique random value and determine whether the value is reflected in the response. ![]() It also includes HTTP headers, although XSS-like behavior that can only be triggered via certain HTTP headers may not be exploitable in practice. This includes parameters or other data within the URL query string and message body, and the URL file path. ![]() Test separately every entry point for data within the application's HTTP requests. Testing for reflected XSS vulnerabilities manually involves the following steps: The vast majority of reflected cross-site scripting vulnerabilities can be found quickly and reliably using Burp Suite's web vulnerability scanner. How to find and test for reflected XSS vulnerabilities The need for an external delivery mechanism for the attack means that the impact of reflected XSS is generally less severe than stored XSS, where a self-contained attack can be delivered within the vulnerable application itself. The attack could be targeted directly against a known user, or could be an indiscriminate attack against any users of the application. These include placing links on a website controlled by the attacker, or on another website that allows content to be generated, or by sending a link in an email, tweet or other message. There are various means by which an attacker might induce a victim user to make a request that they control, to deliver a reflected XSS attack. Initiate interactions with other application users, including malicious attacks, that will appear to originate from the initial victim user. Modify any information that the user is able to modify. View any information that the user is able to view. Perform any action within the application that the user can perform. If an attacker can control a script that is executed in the victim's browser, then they can typically fully compromise that user. If another user of the application requests the attacker's URL, then the script supplied by the attacker will execute in the victim user's browser, in the context of their session with the application.ĪPPRENTICE Reflected XSS into HTML context with nothing encoded Impact of reflected XSS attacks This URL results in the following response: The application echoes the supplied search term in the response to this URL:Īssuming the application doesn't perform any other processing of the data, an attacker can construct an attack like this: Suppose a website has a search function which receives the user-supplied search term in a URL parameter: Reflected cross-site scripting (or XSS) arises when an application receives data in an HTTP request and includes that data within the immediate response in an unsafe way. ![]() In this section, we'll explain reflected cross-site scripting, describe the impact of reflected XSS attacks, and spell out how to find reflected XSS vulnerabilities. Bypassing a CSP with an AngularJS sandbox escape.XSS combined with reflected and stored data ![]()
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