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For more information, see HTTP Repeater tab. This enables you to reproduce external service interaction issues detected by Scanner using Collaborator payloads within the SNI. You can now set custom SNI values in Repeater.

For more information, see Client TLS certificates. This enables you to test target applications that don't directly trust your intermediate CA. You can now set intermediate certificates when you add a new PKCS#11 certificate for hardware token and smart cards. Specify intermediate CA certificates for hardware tokens and smart cards For more information, see Startup behavior. Find this setting on the startup wizard, or in Settings > Suite > Startup behavior > Unrecognized project files. This is especially useful if you are opening project files that came from unknown or untrusted sources. If you deselect Trust this project, Burp can now remove potentially harmful settings that could be configured within project files. We've introduced a new startup setting that enables you to trust or untrust projects. For more information, see HTTP/1 connection reuse. Find this in Intruder > Settings > HTTP/1 connection reuse. This can greatly increase the speed of your attacks when using HTTP/1, as Burp does not need to open a new connection for each request and close it after receiving a response. You can now control whether Intruder reuses connections to issue multiple HTTP/1 requests. Reuse HTTP/1 connections in Intruder to speed up attacks You can also explicitly specify the HTTP mode that the requests should use, if required. These methods enable you to build extensions that can send HTTP requests in parallel and retrieve their responses. Montoya API changesĪs part of these new Repeater features, we have added two sendRequests methods to the Http interface.

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For more information about how to do this, as well as some deliberately vulnerable labs for you to practice on, check out the Race conditions topic on the Web Security Academy.įor more information on sending Repeater groups in parallel, see Sending grouped HTTP requests. Sending synchronized requests in parallel makes it much easier to test for race conditions. After a short delay, these last bytes are sent down each connection simultaneously. This is where multiple requests are sent over concurrent connections, but the last byte of each request in the group is withheld.

When sending over HTTP/1, Repeater uses last-byte synchronization.

This is where multiple requests are sent via a single TCP packet.

When sending over HTTP/2, Repeater sends the group using a single packet attack.

It uses different synchronization techniques depending on the HTTP version used:

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Repeater synchronizes parallel requests to ensure that they all arrive in full at the same time. When you select this option for a tab group, Repeater sends the requests from all of the group's tabs at once. We have added a Send group (parallel) option to Repeater's Group send options menu.

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We have also introduced various other improvements for Burp Suite Professional and Burp Scanner, including the ability to reuse HTTP/1 connections in Intruder, a new project-level Crawl paths tab in the Target tool, and support for GraphQL introspection during scans. These requests are synchronized to arrive within a very small time window, making it much simpler to test for race conditions. Repeater's new single-packet attack feature nullifies network jitter, enabling you to send multiple requests in parallel. This release introduces new Repeater functionality based on the techniques discussed in James Kettle's talk 'Smashing the State Machine: The True Potential of Web Race Conditions', first presented at Black Hat USA 2023.

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