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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