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Message-ID: <1528e110c5f.11ff2dddc43704.3865822946264713459@fsck.pl>
Date: Fri, 29 Jan 2016 16:47:07 +0100
From: enki <enki@...k.pl>
To: <oss-security@...ts.openwall.com>
Cc: <oss-security@...ts.openwall.com>, <pool@...ts.ntp.org>,
<linuxbrad@...il.com>, <team@...urity.debian.org>,
"secalert" <secalert@...hat.com>
Subject: Re: shodan.io actively infiltrating ntp.org IPv6
pools for scanning purposes
---- Wł. Pt, 29 sty 2016 15:21:01 +0100 Hazel napisał(a) ----
>On 27 January 2016 at 14:43, Kurt Seifried <kseifried@...hat.com> wrote:
>> On Wed, Jan 27, 2016 at 4:24 AM, Luca BRUNO <lucab@...ian.org> wrote:
>> > For oss-sec crowd: is there anything we can do to improve the situation
>> > and avoid
>> > similar cases in the future? Should crowd-sourced and fundamental services
>> > like this
>> > be encouraged to move to a stronger WoT?
>>
>> [...]
>>
>> Sadly we can't really rely on the IoT device makers to fix this, they have
>> basically 0 incentive to prevent scanners from hitting their products
>> (they're already sold, to late for the customer to make an informed
>> decision).
>
>I hope you'll forgive me making a modest proposal here, but it seems
>to me that there might be an opportunity here for Linux distributions
>that are upstream of IoT vendors to modify their default configuration
>to address this.
>
>My somewhat off-the-cuff suggestion would be to...
>
>1. Add an *additional, secondary* IPv6 address to external interfaces that is:
>-> a. generated in accordance with the IPv6 Privacy Extensions (i.e. RFC 4941)
>-> b. firewalled by default against all traffic except NTP in either direction
>
>2. Configure the NTP *client* to use this secondary address as the
>source for outgoing NTP traffic, instead of the default address?
>
>...thereby avoiding revealing the primary address of the host to
>would-be scanners?
>
I'd go even further and use the IPv6 privacy-enhanced address for all outgoing connections, not only NTP. It's only a matter of time before someone sets up a debian mirror for example that logs source addresses and launches scans against them.
--
enki@...k.pl
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