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2022-Go-Time-Transcripts

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[886.58 --> 889.62] And they basically broke our logging, entire visibility.
[890.00 --> 895.06] So they were effectively under attack, but now flying blind because we couldn't see anything
[895.06 --> 896.14] because they'd broken all the login.
[896.66 --> 897.24] Oh, no.
[897.84 --> 899.02] That was not a good day.
[899.68 --> 899.96] Yeah.
[900.24 --> 901.40] That one doesn't sound fun.
[901.52 --> 902.08] What happened?
[902.72 --> 905.56] We figured out which customer it was, but we couldn't figure out the rest.
[905.68 --> 908.58] But we asked them what they'd done, and they figured out that bit and stopped it.
[908.72 --> 909.14] Oh, wow.
[909.32 --> 910.06] They fessed up to it.
[910.10 --> 910.84] They owned up to it.
[911.18 --> 912.26] Somebody run infinite loop.
[912.58 --> 912.92] Yes.
[913.58 --> 914.58] I think they realized.
[915.32 --> 917.24] They must have seen what was happening on their side.
[917.24 --> 922.54] So they didn't pull a, well, I will not name names, but they didn't blame any intern?
[923.64 --> 927.52] Oh, we've got a certain thing where we actually, an intern did that.
[927.66 --> 928.48] I heard that intern.
[928.60 --> 929.68] He's actually a really good guy.
[930.00 --> 931.98] He's become a full-time engineer in that team, you know.
[932.32 --> 932.98] He's really good.
[933.22 --> 934.74] Learned a lesson that none of us will replicate.
[935.08 --> 935.44] Oh, yeah.
[935.52 --> 936.48] I love interns.
[936.48 --> 941.34] I just don't like to throw them under the bus when something goes wrong with my company.
[942.62 --> 944.26] No, that one was interesting.
[944.26 --> 946.32] Also, that said, a man-in-the-middle company.
[946.68 --> 947.86] We had a system.
[948.12 --> 949.22] The system was brilliant, right?
[949.26 --> 952.82] You could send an instruction to any machine in the world in under 10 seconds, and every
[952.82 --> 954.36] machine received the same instruction.
[955.36 --> 959.08] And that's great when you want to say there's a new domain name, because you tell the whole
[959.08 --> 959.92] world at the same time.
[960.20 --> 965.04] But it's really bad when you say there's a new way to stop traffic, and we've made a
[965.04 --> 965.94] greedy regex.
[966.32 --> 967.90] And the greedy regex was the problem.
[968.32 --> 972.54] Now, frankly, the system shouldn't have allowed it, but the system did allow it.
[972.54 --> 975.36] And we were all at lunch.
[975.42 --> 976.54] It was an all-hands lunch.
[976.86 --> 981.98] And the next thing we know, we just get people running in going, the internet's down.
[982.56 --> 987.28] Because we used our own systems, and we lost everything internally at the same time.
[988.42 --> 989.82] It was a...
[989.82 --> 990.64] That was hard, too.
[991.12 --> 992.78] I feel like there are many lessons there.
[993.20 --> 994.24] There was a lot of lessons.
[994.60 --> 995.62] What were we having for lunch?
[998.18 --> 999.20] Lunch went cold.
[999.20 --> 1001.40] That's scary, isn't it?
[1001.52 --> 1001.96] But hang on.
[1002.06 --> 1005.18] So just can you explain to someone who doesn't know what a greedy regex is?
[1005.34 --> 1006.14] What do you mean by that?
[1006.68 --> 1007.00] Yeah.
[1007.42 --> 1011.16] A greedy regex, I mean, if you do something like .star, what you're saying is match any
[1011.16 --> 1012.28] character any number of times.
[1012.36 --> 1017.36] But if you do .star, .star, you've now exploded this any character any number of times, followed
[1017.36 --> 1019.26] by any character any number of times.
[1019.36 --> 1021.76] And what you're doing is you're increasing the CPU computation.
[1021.76 --> 1028.24] You still put the same fixed input in, but what it can match is now you've doubled the
[1028.24 --> 1029.84] possibility in just that one go.
[1030.42 --> 1031.80] And essentially, that's what happened.
[1031.98 --> 1034.70] But some of the inputs were web pages and web traffic.
[1035.22 --> 1037.20] So they weren't small.
[1037.32 --> 1038.30] They were quite large inputs.
[1038.68 --> 1040.74] And under that condition, they consumed all the CPU.
[1041.52 --> 1045.74] So wherever this rule was applied, and we had shipped it globally to every single website,
[1045.90 --> 1049.20] every single bit of traffic, we fried every single machine instantly.
[1049.20 --> 1053.24] So it was about four hours for us to recover from that.
[1053.88 --> 1056.62] And the teams I saw, they did interesting things.
[1056.74 --> 1059.98] We were connecting directly to machines and looking at the Prometheus on them because we
[1059.98 --> 1061.26] had no other observability.
[1061.92 --> 1062.14] Wow.
[1062.64 --> 1064.40] And what was the impact of that?
[1064.54 --> 1065.66] How many people were affected?
[1066.24 --> 1067.30] Everything was affected.
[1067.70 --> 1069.04] We knocked out a lot.
[1069.88 --> 1073.30] DNS, TLS, HTTP, everything.
[1073.54 --> 1075.22] It was one of those nightmare scenarios.
[1075.72 --> 1078.70] And you sit there as a company, you sit there and you sort of go, what are these meteorites?
[1078.70 --> 1082.76] The dinosaurs were made extinct by a meteorite as a company or product service offering.
[1083.06 --> 1084.82] What's a meteorite that's going to hit us?
[1085.22 --> 1087.96] At that company, we were hit by every meteorite we predicted.
[1088.50 --> 1089.34] It survived.
[1089.96 --> 1093.98] But still, on the days when they hit, it lays waste to everything.
[1094.50 --> 1095.44] And everyone has them.
[1095.64 --> 1098.74] The thing that you've got to realize is when you're there, you've got to sympathize with,
[1099.08 --> 1101.38] you know, you can externally see another company go through this.
[1101.76 --> 1102.90] They're having a bad day.
[1102.98 --> 1106.04] And you've got to sympathize because one of those meteorites is going to hit you one day.
[1106.04 --> 1110.56] Yeah, we see the hug-ups goes around often on social media and things.
[1110.66 --> 1114.60] People sending their support in those difficult times.
[1115.04 --> 1119.08] Yeah, there's a good tradition of sending cakes to each other to sort of go thinking of you.
[1119.20 --> 1119.38] Yeah.
[1119.54 --> 1122.22] And trying not to have your salespeople the ambulance chase.
[1122.58 --> 1123.34] Mm-hmm.
[1123.34 --> 1128.02] How well was your break glass procedures documented?
[1128.62 --> 1129.42] It was pretty good.
[1129.56 --> 1134.28] We were lucky that this happened during a London lunch hour where all of the SR team,
[1134.66 --> 1136.46] the original SRE team were there.