[ntp:security] Fwd: Questions about CVE-2019-11331

Danny Mayer mayer at pdmconsulting.net
Tue Apr 30 02:38:24 UTC 2019


is this the impetus for draft-gont-ntp-port-randomization-00.txt?

I still don't believe that this is a vulnerability, and I'm not clear
why we need to randomize the port. NTP has builtin protections already
against attacks like this so I would need to understand why it is
considered a vunerability. The contents that I was able to find online
told me almost nothing.

Danny

On 4/29/19 4:41 PM, Harlan Stenn wrote:
>
> On 4/29/2019 11:31 AM, stevos at nwtime.org wrote:
>> Harlan and Matt,
>>
>> Should we reach out to Art Manion?  
> Art is at CERT.  This report came thru Mitre.   Daniel Andolfi is the
> most recent contact we have at Mitre.
>
> There are at least 2 issues here:
>
> - The CVE was filed and we were never notified
> - The content of the CVE was apparently not vetted, and appears
>   to contain a number of ... bogus claims.
>
>> On another note, do we have the CVE#s listed in Bugzilla with the associated bugs that do get reported?  Seems like more folks use the CVE# to call out bugs than they do the numbers we assign to them in Bugzilla.
> With enough money to upgrade support.ntp.org and our bugzilla, we can
> more easily link our bug IDs to CVEs.  We use support.ntp.org and our
> bugzilla because we *use* our bugzilla.  We don't do our work from the
> CVE website.
>
> H
> --
>> Steve
>>
>> -----Original Message-----
>> From: security <security-bounces+stevos=nwtime.org at lists.ntp.org> On Behalf Of Harlan Stenn
>> Sent: Monday, April 29, 2019 3:53 AM
>> To: Matt Ploessel <matt.ploessel at gmail.com>; security at ntp.org
>> Subject: [ntp:security] Fwd: Questions about CVE-2019-11331
>>
>> Matt,
>>
>> It looks like somebody opened up this CVE and never notified us.
>>
>> It also looks like this report is bogus, but I just heard about it in the last few minutes and I'd like to check it out before I say more.
>>
>> I've already heard from one big customer asking about it, as they gave it a CVSS3 score of 9.8, which seems insane and irresponsible.
>>
>> Not the sort of thing I want to see at 0345 when I'm about to fall asleep.
>>
>> H
>>
>> PS - I'm not sending this encrypted because our PGP key has expired and Brad hasn't had time to refresh that yet.  I've asked him if he can get that done sometime "today".
>>
>> -------- Forwarded Message --------
>> Return-Path: <stenn at nwtime.org>
>> X-Original-To: stenn at nwtime.org
>> Delivered-To: stenn at nwtime.org
>> Received: from [10.208.75.157] (75-139-194-196.dhcp.knwc.wa.charter.com
>> [75.139.194.196]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by chessie.everett.org (Postfix) with ESMTPSA id 44t1VS3XtgzL7N; Mon, 29 Apr 2019 10:44:00 +0000 (UTC)
>> Subject: Re: Questions about CVE-2019-11331
>> From: Harlan Stenn <stenn at nwtime.org>
>> To: Marius Rohde <marius.rohde at meinberg.de>
>> Cc: Steve Sullivan <stevos at nwtime.org>
>> References: <1747911970-17953 at srv-kerioconnect.py.meinberg.de>
>> <2d2b3cfb-a8eb-f7aa-f832-ebcc33de8b5f at nwtime.org>
>> Openpgp: preference=signencrypt
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>> Message-ID: <f7f8449c-5440-334f-0e0c-e97628354e44 at nwtime.org>
>> Date: Mon, 29 Apr 2019 03:43:58 -0700
>> User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101
>> Thunderbird/60.6.1
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>> In-Reply-To: <2d2b3cfb-a8eb-f7aa-f832-ebcc33de8b5f at nwtime.org>
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>>
>> Hi Marius,
>>
>> Nobody told us about this one.
>>
>> I'm not certain yet, but this seems completely bogus to me.
>>
>> I'll loop in some wizards and see what I can find.
>>
>> H
>>
>> On 4/29/2019 3:35 AM, Harlan Stenn wrote:
>>> Hi Marius,
>>>
>>> On 4/29/2019 1:37 AM, Marius Rohde wrote:
>>>> Hi Harlan,
>>>>
>>>> we have seen that the problem with the standard port usage is rated 
>>>> critical in the CVE database.
>>>> Do you have more background information? Exists a known exploit, that 
>>>> is able to do a ntp path-off attack?
>>> Which bug corresponds to this CVE report?  I'm not seeing it in any of 
>>> our content.
>>>
>>> H
>>> --
>>>> Thank you in advance.
>>>>
>>>> Mit freundlichem Gruß / With kind regards *Marius Rohde*
>>>>
>>>> *MEINBERG Funkuhren GmbH & Co. KG*
>>>> Lange Wand 9
>>>> D-31812 Bad Pyrmont, Germany
>>>> Phone: +49 (0)5281 9309-485
>>>> Fax: +49 (0)5281 9309-230
>>>> Amtsgericht Hannover 17HRA 100322
>>>> Geschäftsführer: Günter Meinberg, Werner Meinberg, Andre Hartmann, 
>>>> Heiko Gerstung
>>>> Email: marius.rohde at meinberg.de <http://marius.rohde@meinberg.de>
>>>> Internet: www.meinberg.de <https://www.meinberg.de> / 
>>>> www.meinbergglobal.com <https://www.meinbergglobal.com> / 
>>>> www.meinberg.academy <https://www.meinberg.academy>
>>>>
>>>> ---------------------------------------------------------------------
>>>> --- *MEINBERG - Solutions for Time and Frequency Synchronization*
>>>>
>> --
>> Harlan Stenn, Network Time Foundation
>> http://nwtime.org - be a Member!
>> _______________________________________________
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>>



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