When users receive a maliciously crafted request, XSS can occur in the following ways:
In the above example, the user’s session information is transmitted in the query string of the URL, which can be leveraged to steal information.
Another example of XSS in NSS can be seen in the following URL:
XSS can be especially dangerous in e-commerce applications, where users are typically logged in and have their shopping basket details available to hackers.
How to protect against XSS in NSS
There are some steps you can take to protect yourself from XSS:
Check the URL of the request. If it's a malicious request, it will have a different URL pattern than your site and so won't be able to hit your application.
Use parameterization on your URLs. This way each user's session information is being used with their unique ID rather than just being transmitted in the query string of the URL.
Stored XSS in NSS
An example of Stored XSS in NSS is shown here:
XSS can be especially dangerous in e-commerce applications, where users are typically logged in and have their shopping basket details available to hackers.
XSS in Web IDL
In the example above, the malicious code is executed in the browser when a user visits a website that uses Web IDL. The code will be parsed and executed before rendering is attempted.
XSS can happen in any situation where an attacker injects malicious content into a web site's source code. For example, if an attacker injects malicious JavaScript or HTML into the page being viewed by a browser, XSS can occur. XSS attacks have even been known to exploit vulnerabilities in outdated software such as Microsoft Internet Explorer versions 6 (IE6) and 7 (IE7), which would have been vulnerable to XSS exploitation prior to Windows XP Service Pack 3 (SP3) installation.
HTML Injection Attack
When web applications are unable to handle HTML code that is injected into their responses, they can experience serious security concerns.
In the below example, a hacker is able to inject HTML code into the response document of a website, which can be leveraged in XSS attacks.
Timeline
Published on: 09/15/2022 15:15:00 UTC
Last modified on: 09/18/2022 21:57:00 UTC