oss-security - Re: CVE-2018-5407: new side-channel vulnerability on SMT/Hyper-Threading architectures

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <9dab0b73-3bc4-a942-bb9e-6c0b243784c2@canonical.com>
Date: Fri, 9 Nov 2018 08:03:46 -0500
From: Marc Deslauriers <marc.deslauriers@...onical.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE-2018-5407: new side-channel vulnerability on
 SMT/Hyper-Threading architectures

Hi,

On 2018-11-07 2:42 a.m., Billy Brumley wrote:
>>> For the 1.1.0 branch, at
>>>
>>> https://github.com/openssl/openssl/commits/OpenSSL_1_1_0-stable/crypto/ec/ec_mult.c
>>>
>>> everything starting from aab7c770353b1dc4ba045938c8fb446dd1c4531e
> 
> This was not very responsible of me, since the changes are across
> several files. I reckon the best source is checking the diff between
> 1.1.0h and 1.1.0i releases.
> 
> If you are a package maintainer, and are putting together a patch set
> for this, please reach out to me. My team can help test.
> 
<snip>

Could you please confirm the following commits are sufficient to fix CVE-2018-5407?


Elliptic curve scalar multiplication with timing attack defenses (CVE-2018-5407)
https://git.openssl.org/?p=openssl.git;a=commit;h=aab7c770353b1dc4ba045938c8fb446dd1c4531e

Address code style comments
https://git.openssl.org/?p=openssl.git;a=commit;h=f06437c751d6f6ec7f4176518e2897f44dd58eb0

ladder description: why it works
https://git.openssl.org/?p=openssl.git;a=commit;h=33588c930d39d67d1128794dc7c85bae71af24ad

Pass through
https://git.openssl.org/?p=openssl.git;a=commit;h=f916a735bcdce496cebc7653a8ad2e72b333405a

Move up check for EC_R_INCOMPATIBLE_OBJECTS and for the point at infinity case
https://git.openssl.org/?p=openssl.git;a=commit;h=b43ad53119c0ac2ecfa6e4356210ccda57e0d16b

Remove superfluous NULL checks. Add Andy's BN_FLG comment.
https://git.openssl.org/?p=openssl.git;a=commit;h=2172133d0dc58256bf776da074c0d1944fef15cb


Thanks!

Marc.

-- 
Marc Deslauriers
Ubuntu Security Engineer     | http://www.ubuntu.com/
Canonical Ltd.               | http://www.canonical.com/

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.