Can’t believe it’s still dead… -Mike
> On Mar 26, 2023, at 17:13, 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 _______________________________________________ Outages mailing list [email protected] https://puck.nether.net/mailman/listinfo/outages
