Questions tagged [http2]

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Decrypting Data field of HTTP2 packet in Wireshark

I have pcap file that consists of HTTP/2 requests. Communication between two machines used basically done through Encryption using JSON Web Encryption (JWE) and encapsulate and encapsulates the ...
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2 votes
0 answers
143 views

What are NGINX reverseproxy users doing to prevent HTTP Request smuggling?

Since NGINX does not support sending HTTP/2 requests upstream, what are the present NGINX reverseproxy users doing to mitigate HTTP Request Smuggling vulnerability? I understand that the best way to ...
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2 votes
1 answer
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Timeless timing attacks and response jitter

I've been researching timeless timing attacks, ie: timing attacks using concurrency rather than round trip time. Here is an article by portswigger with links to the original article by Van Goethem. ...
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1 answer
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Nessus Plugin "HTTP Smuggling Detection" failing due to support for http/1.1 - how to overcome?

A new Nessus plugin (140735 - HTTP Smuggling Detection) was very recently incorporated into Tenable's PCI template and is now beeing flagged as a "medium" vulnerability and causing scans to ...
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9 votes
1 answer
989 views

Does HTTP/2 prevent security vulnerabilites like CRLF injection?

Which vulnerabilites does HTTP/2 prevent? More specifically: Does it prevent HTTP request smuggling? Does it prevent HTTP response splitting / CRLF injection?
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22 votes
2 answers
4k views

Is there any point in having the HSTS header enabled when using HTTP/2?

As a protection against attacks such as SSLstrip, the HSTS header prevents an attacker from downgrading a connection from HTTPS to HTTP, as long as the attributes of the header are properly configured....
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-1 votes
2 answers
2k views

Interpreting SSLLabs Handshake simulation results

While testing SSL/TLS details on ssllabs.com for a website, the Handshake Simulation part contains: TLS 1.2 > http/1.1 TLS 1.2 > h2 For eg: What do these things mean? I couldn't find it ...
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4 votes
2 answers
2k views

How to MiTM HTTP/2 Traffic

I recently had to MiTM an HTTP/2 connection over TLS and realized there is no MiTM tool out there that fully supports HTTP/2 over TLS, and no articles/blog posts written about this topic. After ...
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7 votes
2 answers
913 views

Alternative to client certificate authentication with HTTP/2

We are currently busy improving an Android application with connects to an Azure App Service API using client certificates and bearer token for authentication over TLS 1.2. We are investigating ...
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1 vote
2 answers
189 views

CORS clarification

I need some clarifications about the problems that CORS (Cross-Origin Resource Sharing) can cause. Let's suppose that site A.COM has enabled CORS, in particular: Access-Control-Allow-Origin can be ...
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1 vote
0 answers
117 views

Converting HTTP/2 without TLS traffic into HTTP/1.1 [closed]

I'd like to have a listener understanding HTTP/2 without TLS ("prior knowledge HTTP/2"). The listener should then translate the received traffic into HTTP/1.1 and forward it to a desired location. ...
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1 answer
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Static Key Ciphers and key persistence

A vulnerability report states the following: The server is configured to support ciphers known as static key ciphers. These ciphers don't support "Forward Secrecy". In the new specification for ...
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Must one have SSL certificates for each domain, to use HTTPS? [duplicate]

I read in the following passage in this DigitalOcean article, concerning HTTP/2: Even though HTTP/2 does not require encryption, developers of two most popular browsers, Google Chrome and Mozilla ...
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28 votes
2 answers
5k views

What are possible security problems of enabling HTTP2?

I want to enable HTTP2 for several web servers but I'm worried about the possible security implications. I think about something like: HTTP2 implementations are maybe more error prone than mature ...
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0 votes
1 answer
120 views

Are URLs viewed during HTTPS/2 transactions to one or more websites from a single IP distinguishable?

This is a follow up to the original question Are URLs viewed during HTTPS transactions to one or more websites from a single IP distinguishable? D.W. provided an extensive summary on attack vectors ...
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2 votes
3 answers
13k views

Why can't we use POST method for all requests? [closed]

It is known that sensitive information should not be transmitted in GET requests as GET requests will be cached and POST should be used. Why can't we use POST method for all request and ignoring GET ...
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6 votes
2 answers
954 views

What are the security benefits or risks of HTTP/2?

Since HTTP/2 is starting to get adopted by more and more sites everyday. Are there any security benefits or known risks regarding HTTP/2?
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4 votes
1 answer
686 views

What security benefits does ALPN bring to TLS?

I've been recommending Application-Layer Protocol Negotiation (the successor to Next Protocol Negotiation) to people for a while, but recently realised that I actually don't have a concrete example of ...
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-8 votes
2 answers
274 views

HTTP websites vs HTTPS websites [closed]

Why do we say that an http website is not secure compared to an https website?
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3 votes
2 answers
9k views

Understanding blacklisted ciphers for HTTP2

I've been working on get HTTP2 support running on an Nginx server for some time now. At this point I'm stuck at selecting ciphers to support. Hopefully you can help me understand this. Before I ...
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2 votes
2 answers
7k views

Cipher suite selection for compatibility with http/2, and TLS 1.0-1.2

I have been attempting to configure my site to have http/2 support, but I kept having to remove cipher suites because of the blacklist. Eventually, I got the list whittled down sufficiently. The ...
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2 votes
1 answer
200 views

Are there strong technical reasons for browsers mandating TLS for http2?

I realise there are similar questions around this topic, however, I think this is sufficiently different/focused not to be a duplicate. I hope it doesn't sound like a soapbox piece. HTTP/2 ...
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9 votes
2 answers
982 views

Why doesn't the HTTP/2 spec require TLS?

Although no browser implements the full HTTP/2 spec right now limiting themselves to just the TLS part there are stories on the internet that this incomplete implementation of the spec is a way of ...
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