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Date: Mon, 16 Dec 2013 19:27:34 -0800
From: coderman <>
To: cpunks <>, 
 Full Disclosure <>
Subject: Re: RDRAND used directly when default engines
 loaded in openssl-1.0.1-beta1 through openssl-1.0.1e

On Sat, Dec 14, 2013 at 4:33 AM, coderman <> wrote:
> ...
> if you are using an application linked with openssl-1.0.1-beta1
> through openssl-1.0.1e you should do one of the following:

updated list with env suggestion:

a.) rebuild your OpenSSL with OPENSSL_NO_RDRAND defined

b.) call ENGINE_unregister_RAND() on "rdrand" engine followed by
ENGINE_register_all_complete() to unregister rdrand as default

c.) set OPENSSL_ia32cap="~0x4000000000000000" in global environment
(this is poor fix)

d.) git pull latest openssl with commit: "Don't use rdrand engine as
default unless explicitly requested." - Dr. Stephen Henson

"what is affected??" - someone

sorry, i am not your distro maintainer.  but the list includes,
potentially (depending on configure opts / runtime / etc):
RHEL 6.5, 7.0
Centos 6.5
Fedora 18,19,rawhide
Ubuntu 12.04, 12.10, 13.04, 13.10, trusty
Debian 7.0, jessie, sid
Gentoo stable&unstable
Knoppix 7.0.5, 7.2.0
Kali 1.0.5
Slackware 14, 14.1, current
... if ssh built with --with-ssl-engine. these all use OpenSSL 1.0.1+.
 (remember both ssh client and server may use engines!)

and other libs, like:
... which appear to use OpenSSL default engines.

but really, you should go check your shit.

best regards,

P.S. if anyone is aware of RDRAND engine backports to OpenSSL 1.0.0*
or 0.9.8* in any distros i'd like to know about it!

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