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Date: Wed, 18 Jan 2017 00:55:40 -0500
From: <cve-assign@...re.org>
To: <vdronov@...hat.com>
CC: <cve-assign@...re.org>, <oss-security@...ts.openwall.com>
Subject: Re: CVE request -- linux kernel: crash by spawning mcrypt(alg) with incompatible algorithm

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> Algorithms not compatible with mcryptd could be spawned by mcryptd with a direct
> crypto_alloc_tfm invocation using a "mcryptd(alg)" name construct. This causes
> mcryptd to crash the kernel if an arbitrary "alg" is incompatible and not intended
> to be used with mcryptd.
> 
> This could be a potential attack to crash the kernel by user program using AF_ALG
> to request an invalid algorithm such as mcryptd(md5).
> 
> Initial discussion:
> 
> https://marc.info/?l=dm-devel&m=148063708010538&w=2
> 
> Suggested Patch:
> 
> http://marc.info/?l=linux-crypto-vger&m=148096718218312&w=2
> 
> Red Hat Product Security Bugzilla:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=1404200
> 
> Upstream patch:
> 
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=48a992727d82cb7db076fa15d372178743b1f4cd
>> crypto: mcryptd - Check mcryptd algorithm compatibility

Use CVE-2016-10147.

- -- 
CVE Assignment Team
M/S M300, 202 Burlington Road, Bedford, MA 01730 USA
[ A PGP key is available for encrypted communications at
  http://cve.mitre.org/cve/request_id.html ]
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