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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