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Date: Thu, 2 Feb 2017 09:31:30 +0100
From: Pierre Kim <pierre.kim.sec@...il.com>
To: cve-assign@...re.org
Cc: oss-security@...ts.openwall.com
Subject: Re: CVE requests: OpenBSD httpd - 2 DoS
Hello,
>[...]
>> DoS: CPU exhaustion with SSL client-initiated renegotiation,
>
>Is this a public vulnerability? It does not have any obvious match with the
>latest https://github.com/openbsd/src/commits/master/usr.sbin/httpd 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 http://marc.info/?l=openbsd-cvs&m=148587695222112&w=2
> libtls http://marc.info/?l=openbsd-cvs&m=148587827322528&w=2
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.
Regards,
--
Pierre Kim
pierre.kim.sec@...il.com
@PierreKimSec
https://pierrekim.github.io/
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