S3E10: "DNS Near"
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|S3E9: "Git Outta Here"||S3E11: "But First, Let Paden Take a SELFie"|
|Recorded (UTC)||Aired (UTC)||Editor|
|2018-07-08 21:16:27||2018-07-15 01:08:36||"Edita"|
It was, in fact, DNS (this time!).
We talk about some basics of DNS via a bird’s-eye-view of how it works.
- Data for mobile apps using the Firebase backend has been breached.
- Kazashkstan caught engaging in Internet censorship via speed throttling that targets political rivals.
- Two 0day exploits have been discovered in a PDF with a joint effort between Microsoft and ESET.
- A VA eBenefits account has been compromised.
- Marketing firm Exactis has leaked 340 million accounts (including contact/personally identifying information AND further habitual/lifestyle/etc. data correlated to those).
- It has been ruled by the Supreme Court that the Fourth Amendment applies to cell phone location data. (Hooray!)
- A man attempted to hijack a domain at gunpoint and is sent to prison for 20 years.
- Tapplock, the “smart padlock” (notorious by now for having a biometric auth via fingerprint scanning that is thwarted by… a jeweler’s screwdriver) has another attack surface as well.
- Gentoo’s GitHub repositories were found to be compromised (but it does not seem to be a serious issue per Gentoo).
Starts at 20m17s.
I was drinking water. Paden was drinking a “diet soda” (he didn’t specify which). Jthan was drinking a Miller Lite.
- DNS (Domain Name System)
- (I mention in a throwaway comment nmap, which we’ve talked about before, and masscan.)
- It serves primarily as a human-friendly directory for IP addresses.
- There are Authoritative Nameservers, Resolvers, and Root (Name)Servers
- Authoritative serve records and their contents (e.g. “foo.bar.com is an A record for 126.96.36.199”)
- Root servers operate with registrars and authoritative nameservers to “learn” the domains and develop a query path for resolvers to take. Resolvers (which usually cache the records they look up, and can either resolve for a specific domain or “recurse” to find other domains) then serve records to clients (browsers/workstations, etc.) — which may also perform caching of their own as well.
- There are a multitude of DNS record types. You can find an extensive amount of RFCs for DNS here and here. It is highly recommended you read them.
- We mention DNSSEC in passing, but there are some alternatives being discussed.
- Jthan brings up DNS over HTTPS (currently in draft format). I mention that for one, Unbound can support DNS over TLS, which I argue is better.
- We also talk about glue records. For an example of this, do a WHOIS (note the authoritative nameservers) and a DNS analysis on sysadministrivia.com. ;)
In this segment, we highlight system administration mistakes. Think of them as the IT equivalent of the Darwin Awards. (44m10s)
A betting/gambling site, BetVictor, leaked creds to its own infra … via a help article.
- Our audio was TOTALLY off for this episode, so sorry! Paden was totally blown out (I received the recording in that condition), and Jthan was peaking a couple times (and he almost never peaks). Sorry!
- He also had a baby on his lap, so there’s some background noise we couldn’t remove. Apologies.
- The SRV record is no longer a draft, but is now a proposed standard.
- It appears that Unbound does not (yet) support DNS over HTTPS, but it DOES support DNS over TLS.
|Intro||Say It Again, I'm Listening||Daniel Birch||click||CC-BY 4.0||Outro||Suddenly It Occurs To Me There's No Ocean Here||Artificial Intelligence in Texas||click||CC-BY-SA 4.0|