xss-scanner

xss-scanner

Cross-Site Scripting (XSS) scanner. This tool helps to find possible XSS vulnerabilities. It's intended use is to help "plug" the vulnerability, not exploit. Be nice. Make the web better.

The three most important countermeasures to prevent cross-site scripting attacks are to:

• Constrain input.
• Encode output.
• Filter user input.

Url encode output URLs if they are constructed from input.

Html encode output if it contains input from the user or from other sources such as databases.

Installation

npm install

Configuration

Open up the config.js file and configure the xssOptions() return object.

Run

npm start

Results

The console shows the XSS parameter values that have made it back with a status code 200. You can also dump the resulting Html to a file. Unfortunately, you have to manually check these. I prefer to use the latest version of Firefox with add-ons and extensions disabled. Other XSS tools, such as Burp Suite, also require some manual checking.

At the top of the Html content, look for a <![CDATA[ \"-alert(123456789))// ]]>. It contains the offending XSS injection payload value.

Additional Resources

OWASP XSS Cheatsheet