The standard HTTP/2-exclusive attacks – The most important Daily Swig

burpsuite twittercard ProxyEgg The standard HTTP/2-exclusive attacks - The most important Daily Swig

When you intercept a trustworthy request in Burp Proxy server, or send it on the way to Burp Repeater, the Inspector enables you to work with HTTP/2 headers and pseudo-headers in a way that securely resembles the underlying request.

Nearly header and pseudo-header has its own entry under Request Headers , put into distinct Establish and Value fields. Although we should never show you the actual binary, it is really an accurate representation of so what will be sent to the machine. You can see this in action belonging to the following video demonstration:

As this advice is completely decoupled from HTTP/1, you aren’t bound by the disadvantage of HTTP/1 syntax at what point constructing malicious requests. This lets you to perform some advanced, HTTP/2-exclusive attacks .

For example , you can:

  • Inject colons into header names.

  • Inject dictatorial spaces or newlines on the inside the method and path.

  • Inject newlines anywhere within a header recognize or value.

You can make a good number of changes by just double-clicking title or value of a header in the main Inspector view.

According to the specification, this kind of injections should cause the exact request to be rejected using the server, but some servers stand them anyway. Burp is now the only tool that enables you to take advantage of this behavior.

Note

Once you apply these changing, the message editor likely to be unable to accurately represent and the request using HTTP/1 format without losing information. In this case, currently the request is considered ” kettled in.

Injecting newlines to make headers

To inject a newline into a very HTTP/2 header or price point, drill down into the header by clicking the chevron to the right of its accessibility in the Inspector. From this consider, you can select either the exact Name or Value particular field and press the Shift + Revisit keys to the sequence \r\n .

Source of this news: https://portswigger.net/burp/documentation/desktop/http2/performing-http2-exclusive-attacks

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