This belongs on the outages discussion list, NOT here. This is only for outages and the immediate outage info. If you don’t understand why, go ask on THAT list.
-- Carlos Alvarez 602-368-6403 On Mar 26, 2023 at 5:13 PM -0700, T.Suzuki via Outages <[email protected]>, wrote: > On Sun, 26 Mar 2023 08:35:29 -0700 > Hugo Slabbert <[email protected]> wrote: > > > What would be the symptoms here of a "water torture attack" rather than > > what John had indicated as a firewall failure in their infrastructure: > > > > > Initial looks from the firewall team point to an automatic failover event > > and the secondary failed. > > > > And the symptoms of which lined up with network level info from Paul > > earlier: > > > > > They only seem to have two auth nameservers for faa, both within the > > faa.gov domain. Don't seem to be anycasted and the 2 v4 and 2 v6 blocks the > > servers are in all die just within each block run by the FAA. > > > > > > Seems like an internal routing meltdown making the only 2 nameservers > > unreachable reliably. > > > > Are you saying that your open resolvers have a per client rate limit > > applied, that rate limit got tripped, and shortly thereafter the resolvers > > became unavailable, suggesting query floods for the domain(s) that knocked > > the resolvers offline (or from the other discussion, possibly was the thing > > that overwhelmed that firewall layer, causing the initial failover and > > possibly also causing the firewall secondary to fail to come online)? > > Yes. (limitting per client, and per second for all) > Perhaps, large numbers open resolvers including no ratelimit are used. > Then massive random subdomain queries caused the firewall symptoms. > (It's only my guess.) > > > On Sun, Mar 26, 2023, 01:13 T.Suzuki via Outages <[email protected]> > > wrote: > > > > > Hi, I'm a researcher of DNS vulnerabilities. > > > > > > It loos like random subdomain attacks (water tourtue attack). > > > > > > This is the data of my rate-limitted openresolver as a honeypot. > > > http://www.e-ontap.com/dns/todaydowngov.txt > > > http://www.e-ontap.com/dns/todaydown.txt > > > (You can not view these page if you are using 8.8.8.8, sorry.) > > > > > > Raw logs of my Unbound (Time is JST) > > > local/etc/unbound% grep "\.faa\.gov" unbound.log | grep "SERVFAIL" | head > > > -5 > > > Mar 26 12:00:35 unbound[48103:0] error: SERVFAIL < > > > unnamed568.orphaned.faa.gov. A IN>: exceeded ratelimit for zone faa.gov. > > > Mar 26 12:00:35 unbound[48103:0] reply: 24.199.82.210 > > > unnamed568.orphaned.faa.gov. A IN SERVFAIL 9.226781 0 45 > > > Mar 26 12:04:31 unbound[48103:0] error: SERVFAIL <amax.faa.gov. A IN>: > > > exceeded ratelimit for zone faa.gov. > > > Mar 26 12:04:31 unbound[48103:0] reply: 24.199.82.210 amax.faa.gov. A IN > > > SERVFAIL 15.112813 0 30 > > > Mar 26 12:04:37 unbound[48103:0] error: SERVFAIL <dallatx.faa.gov. A IN>: > > > exceeded ratelimit for zone faa.gov. > > > local/etc/unbound% > > > local/etc/unbound% grep "\.faa\.gov" unbound.log | grep "all servers" | > > > head -5 > > > Mar 26 12:05:26 unbound[48103:0] error: SERVFAIL <epoxy.faa.gov. A IN>: > > > all servers for this domain failed, at zone faa.gov. from > > > 2620:74:27::2:30 no server to query nameserver addresses not usable > > > Mar 26 12:05:27 unbound[48103:0] error: SERVFAIL > > > <lyndas365project.faa.gov. > > > A IN>: all servers for this domain failed, at zone faa.gov. no server to > > > query nameserver addresses not usable > > > Mar 26 12:05:28 unbound[48103:0] error: SERVFAIL <lmn.faa.gov. A IN>: all > > > servers for this domain failed, at zone faa.gov. no server to query > > > nameserver addresses not usable > > > Mar 26 12:05:30 unbound[48103:0] error: SERVFAIL <host244.faa.gov. A IN>: > > > all servers for this domain failed, at zone faa.gov. upstream server > > > timeout > > > Mar 26 12:05:33 unbound[48103:0] error: SERVFAIL <leased-line188.faa.gov. > > > A IN>: all servers for this domain failed, at zone faa.gov. upstream > > > server timeout > > > local/etc/unbound% > > > local/etc/unbound% grep "\.faa\.gov" unbound.log | grep "all servers" | > > > tail -5 > > > Mar 26 13:41:08 unbound[48103:0] error: SERVFAIL <asm.faa.gov. A IN>: all > > > servers for this domain failed, at zone faa.gov. no server to query > > > nameserver addresses not usable > > > Mar 26 13:41:15 unbound[48103:0] error: SERVFAIL <sas-uss.edc.nas.faa.gov. > > > A IN>: all servers for this domain failed, at zone faa.gov. no server to > > > query nameserver addresses not usable > > > Mar 26 13:41:22 unbound[48103:0] error: SERVFAIL < > > > eforms-stagedev.hq.faa.gov. A IN>: all servers for this domain failed, at > > > zone faa.gov. no server to query nameserver addresses not usable > > > Mar 26 13:41:23 unbound[48103:0] error: SERVFAIL < > > > faardm-mceast2.idrac.faa.gov. A IN>: all servers for this domain failed, > > > at zone faa.gov. no server to query nameserver addresses not usable > > > Mar 26 13:41:28 unbound[48103:0] error: SERVFAIL <chronos3.faa.gov. A > > > IN>: all servers for this domain failed, at zone faa.gov. no server to > > > query nameserver addresses not usable > > > local/etc/unbound% > > > local/etc/unbound% grep "\.faa\.gov" unbound.log | grep "SERVFAIL" | tail > > > -5 > > > Mar 26 13:41:22 unbound[48103:0] reply: 24.199.82.210 > > > eforms-stagedev.hq.faa.gov. A IN SERVFAIL 0.000000 0 44 > > > Mar 26 13:41:23 unbound[48103:0] error: SERVFAIL < > > > faardm-mceast2.idrac.faa.gov. A IN>: all servers for this domain failed, > > > at zone faa.gov. no server to query nameserver addresses not usable > > > Mar 26 13:41:23 unbound[48103:0] reply: 24.199.82.210 > > > faardm-mceast2.idrac.faa.gov. A IN SERVFAIL 0.000000 0 46 > > > Mar 26 13:41:28 unbound[48103:0] error: SERVFAIL <chronos3.faa.gov. A > > > IN>: all servers for this domain failed, at zone faa.gov. no server to > > > query nameserver addresses not usable > > > Mar 26 13:41:28 unbound[48103:0] reply: 24.199.82.210 chronos3.faa.gov. A > > > IN SERVFAIL 0.000000 0 34 > > > local/etc/unbound% > > > local/etc/unbound% grep "\.faa\.gov" unbound.log | grep "all server" | wc > > > -l > > > 1408 > > > > > > -- > > > T.Suzuki > > > -- > > > T.Suzuki / E.F.シューマッハーとI.イリイチを読もう > > > _______________________________________________ > > > Outages mailing list > > > [email protected] > > > https://puck.nether.net/mailman/listinfo/outages > > > > > > -- > T.Suzuki / E.F.シューマッハーとI.イリイチを読もう > _______________________________________________ > Outages mailing list > [email protected] > https://puck.nether.net/mailman/listinfo/outages
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