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URL encode the user data and prevent the use of ampersand as it may lead to parameter pollution issues.
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Prevent JavaScript from running by using a protocol handler. Take notice to the protocol specified and if you expect HTTP or HTTPS links, whitelist those. URL encode the user data, whitelist known URLs and run the user data through a proper URL library in your language. onclick), at they are made to execute JavaScript. Be very cautious when providing user data into DOM event handlers (e.g. See PHP htmlspecialchars() HTML AttributesĬonvert the untrusted user input to HTML entities to prevent the creation of other attributes and nver let any user data into the “id”, “class” or “name” parameters. Here are some general tips (where UNTRUSTED is where user supplied data). The remediation of XSS vulnerabilities is heavily context-dependent and the patches vary. This is a common example of a privilege escalation attack by the means of cross-site scripting and session riding. The attacker will then be able to set their own cookie to the victim’s stolen one, hence gaining access the victim’s data.
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The JavaScript will grab the user’s cookie and send it off bounds to a third party domain of the attackers control. The HTML contains a script tag which will evaluate JavaScript. Since there is no validation of the data, the target browser will render: Could not find any pages when searching for document.InnerHTML += "" This would make the victim search for: document.InnerHTML += “” Imagine an attacker sends a link like the following to a victim: += "" If the search query contains HTML, the user’s web browser will render it. This would, in other words, output the user supplied data (the search query) straight into the HTML document. ”.ĭoing this in PHP it might look something like this: If there is no result, the site should say “Could not find any pages when searching for.
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