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Date: Thu, 2 Feb 2017 09:31:30 +0100
From: Pierre Kim <>
Subject: Re: CVE requests: OpenBSD httpd - 2 DoS



>> DoS: CPU exhaustion with SSL client-initiated renegotiation,
>Is this a public vulnerability? It does not have any obvious match with the
>latest commits.

>From OpenBSD team:

> o High CPU usage is a well-known issue of client-initiated
> renegotiation.  While this can cause higher than normal CPU usage, the
> processes are still able to service requests.
> As httpd uses LibreSSL's libtls, a sane TLS API on top of libssl, we
> decided to disable client-initiated renegotiation for libtls servers
> in -current. This change was already planned and has now been
> committed to LibreSSL.
> libssl
> libtls

If you think it doesn't deserve a CVE, then I will publish the advisory without.
>From my tests, during an attack, the httpd has some difficulties to
provide replies to clients.


Pierre Kim

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