This extension identifies server side prototype pollution vulnerabilities, and requires Burp Suite v2021.9 or later.

To use this extension simply right-click on a request, go to the extensions menu then server side prototype pollution and choose one of the scan options:

• Body scan - Scans JSON bodies with the techniques
• Body dot scan - Scans JSON bodies using dots, for example __proto__.x
• Body square scan - Scans JSON bodies using square bracket syntax such as __proto__[x]
• Param scan - Scan JSON inside query parameters and others. Note there has to be existing JSON in the base request.
• Param dot scan - Scans for JSON inside query parameters using the dot syntax.
• Param square scan - Scans for JSON inside query parameters using square bracket syntax.
• Add js property scan - Used to find leaking JavaScript code by adding query parameters such as constructor.
• JS property param scan - Used to find leaking JavaScript code by manipulating parameters with names like constructor.
• Async body scan - Attempts to find prototype pollution asynchronously using the --inspect flag.
• Async param scan - Attempts to find prototype pollution asynchronously using the --inspect flag inside query parameters and others.
• Full scan - Tries to find prototype pollution using all the methods.

Multiple techniques are used to detect prototype pollution and are described in the PortSwigger blog post.

• JSON spaces
• Async
• Status
• Options
• Blitz
• Exposed headers
• Reflection
• Non reflected property

For further information, please refer to the whitepaper at https://portswigger.net/research/server-side-prototype-pollution