How Calico Cloud’s runtime defense mitigates Kubernetes MITM vulnerability CVE-2020-8554
Since the release of CVE-2020-8554 on GitHub this past December, the vulnerability has received widespread attention from industry media and the cloud security community. This man-in-the-middle (MITM) vulnerability affects Kubernetes pods and underlying hosts, and all Kubernetes versions—including future releases—are vulnerable.
Despite this, there is currently no patch for the issue. While Kubernetes did suggest a fix, it only applies to external IPs using an admission webhook controller or an OPA gatekeeper integration, leaving the door open for attackers to exploit other attack vectors (e.g. internet, same VPC cluster, within the cluster). We previously outlined these in this post.
Suggested fixes currently on the market
Looking at the Kubernetes security market, there are currently a few security solutions that attempt to address CVE-2020-8554. Most of these solutions fall into one or two of three categories:
- Detection (using Kubernetes audit logs)
- Prevention (using admission webhook controller)
- Runtime defense (inline defense)
A few of the solutions rely on preventing vulnerable deployments using an OPA gatekeeper integration; these solutions alert users when externalIP (possibly loadBalancerIP) is deployed in their cluster configurations. Most solutions, however, present a dual strategy with a focus on prevention and detection. They use an admission controller for Continue reading
History of Internet 2: Dale Finkelsen
The Internet was originally designed as a research network, but eventually morphed into a primarily commercial system. While “Internet 2” sounds like it might be a replacement for the Internet, it was really started as a way to interconnect high speed computing systems for researchers—a goal the Internet doesn’t really provide any longer. Dale Finkelsen joins Donald Sharp and Russ White for this episode of the History of Networking to discuss the origins of Internet 2.
Nokia Lab | LAB 2 OSPF |
Introduction
Hello everyone!
It's my second Nokia lab. I've tried to cover the main scope of OSPF questions. Lets lab!
Please check my first lab for input information.
Topology example
Lab tasks and questions:
- Basic OSPF (Backbone area)
- configure OSPF area 0 (R1 and R2, use P2P interface type, add “system” interface to OSPF)
- configure BFD and authentication on interfaces
- examine BFD session
- examine the connection between OSPF adjacency and BFD session
- How can you break adjacency? Try it. What factors can influence adjacency?
- What LSA types do you see?
- examine every LSA in detail
- What is the default preference of OSPF routes?
- Multi-area OSPF(Area 0, Area 1 TNSSA, Area 2 Normal, Area 3 Totally Stub)
- configure area 1 as a Totally NSSA area
- run debug OSPF hello packets between R1 and R3
- examine hello packets
- Does it contain special bits?
- export it to OSPF by policy
- What router type is R3?
- examine LSDB on R3 - especially check NSSA external LSA
- Does it contain special bits? Describe purpose of them
Tier 1 Carriers Performance Report: March, 2021
The post Tier 1 Carriers Performance Report: March, 2021 appeared first on Noction.
Free Exercise: Build Network Automation Lab
A while ago, someone made a remark on my suggestions that networking engineers should focus on getting fluent with cloud networking and automation:
The running thing is, we can all learn this stuff, but not without having an opportunity.
I tend to forcefully disagree with that assertion. What opportunity do you need to test open-source tools or create a free cloud account? My response was thus correspondingly gruff:
Tech Bytes: Prioritizing Identity And Zero Trust Across The Network With Aruba (Sponsored)
On today's Tech Bytes, sponsored by Aruba Networks, we discuss the role of identity in security and why identity is a critical component of a zero-trust approach to network access. Our guest from Aruba is Jon Green, Chief Security Technologist.
The post Tech Bytes: Prioritizing Identity And Zero Trust Across The Network With Aruba (Sponsored) appeared first on Packet Pushers.
Tech Bytes: Prioritizing Identity And Zero Trust Across The Network With Aruba (Sponsored)
On today's Tech Bytes, sponsored by Aruba Networks, we discuss the role of identity in security and why identity is a critical component of a zero-trust approach to network access. Our guest from Aruba is Jon Green, Chief Security Technologist.Time and Mind Savers: RSS Feeds
I began writing this post just to remind readers this blog does have a number of RSS feeds—but then I thought … well, I probably need to explain why that piece of information is important.
The amount of writing, video, and audio being thrown at the average person today is astounding—so much so that, according to a lot of research, most people in the digital world have resorted to relying on social media as their primary source of news. Why do most people get their news from social media? I’m pretty convinced this is largely a matter of “it saves time.” The resulting feed might not be “perfect,” but it’s “close enough,” and no-one wants to spend time seeking out a wide variety of news sources so they will be better informed.
The problem, in this case, is that “close enough” is really a bad idea. We all tend to live in information bubbles of one form or another (although I’m fully convinced it’s much easier to live in a liberal/progressive bubble, being completely insulated from any news that doesn’t support your worldview, than it is to live in a conservative/traditional one). If you think about the role of Continue reading
On the ‘net: From Stamps to the Stack
I’ve started publishing in the Public Discourse on topics of technology and culture; the following is the first article they’ve accepted. Note the contents might be classified as a little controversial.
Network Break 327: Cisco Embraces As-A-Service Procurement; Will Amazon Make Its Own ASICs?
Today's Network Break sifts through the most interesting news from Cisco Live 2021 including an as-a-service procurement model, support for biometric-based authentication, integrating ThousandEyes and AppDynamics, and more. We also examine reports that Amazon is designing its own switch ASIC, and discuss new research on harvesting power from 5G electromagnetic waves.Network Break 327: Cisco Embraces As-A-Service Procurement; Will Amazon Make Its Own ASICs?
Today's Network Break sifts through the most interesting news from Cisco Live 2021 including an as-a-service procurement model, support for biometric-based authentication, integrating ThousandEyes and AppDynamics, and more. We also examine reports that Amazon is designing its own switch ASIC, and discuss new research on harvesting power from 5G electromagnetic waves.
The post Network Break 327: Cisco Embraces As-A-Service Procurement; Will Amazon Make Its Own ASICs? appeared first on Packet Pushers.
CONTAINERlab
CONTAINERlab is a Docker orchestration tool for creating virtual network topologies. This article describes how to build and monitor the leaf and spine topology shown above.
Note: Docker testbed describes a simple testbed for experimenting with sFlow analytics using Docker Desktop, but it doesn't have the ability to construct complex topologies.
multipass launch --cpus 2 --mem 4G --name containerlab
multipass shell containerlab
The above commands use the multipass command line tool to create an Ubuntu virtual machine and open shell access.
sudo apt update
sudo apt -y install docker.io
bash -c "$(curl -sL https://get-clab.srlinux.dev)"
Type the above commands into the shell to install CONTAINERlab.
Note: Multipass describes how to build a Mininet network emulator to experiment with software defined networking.
name: test
topology:
nodes:
leaf1:
kind: linux
image: sflow/frr
leaf2:
kind: linux
image: sflow/frr
spine1:
kind: linux
image: sflow/frr
spine2:
kind: linux
image: sflow/frr
h1:
kind: linux
image: alpine:latest
h2:
kind: linux
image: alpine:latest
links:
- endpoints: ["leaf1:eth1","spine1:eth1"]
- endpoints: ["leaf1:eth2","spine2:eth1"]
- endpoints: ["leaf2:eth1","spine1:eth2"]
- endpoints: ["leaf2:eth2","spine2:eth2"]
- endpoints: ["h1:eth1","leaf1:eth3"]
- endpoints: ["h2:eth1","leaf2:eth3"]
The test.yml file shown above specifies the topology. In this case we are using FRRouting (FRR) containers for the leaf Continue reading
It’s Not What You Say. It’s How You’re Heard.
In written communication, technical people can sometimes come across as impolite. I see this on Slack (talking down), Twitter (the angry tweeter), in emails (blunt and terse), in blog comments (bitter sarcasm or pedantry), Hacker News discussions (aggressive confrontation), and other places IT builders gather online.
Perhaps you, as just such a technical person, don’t mean to be impolite. Maybe your focus is on efficiency. Get to the point. Say what needs saying, however it comes out. Click send. Job done. Go back to facepalming at the Swagger docs explaining this ill-considered API you need to use.
Here’s the problem with your communications approach. To the person receiving your missive, you might sound like you’re upset. Or tone-deaf. Or maybe just a jerk. You’re presumably none of those things, at least not intentionally. We’re all nice folks who want to get along with our fellow humans, right?
It’s not what you say. It’s how you’re heard.
You need to communicate in such a way that you’re heard as you mean to be heard. If you’re not good at this and want to be, you can improve your messaging.
Before hitting send, engage in role reversal. If you received a Continue reading
The Week in Internet News: Biden Wants Broadband for All
Filling the gaps: U.S. President Joe Biden has proposed spending $100 billion over eight years to bring broadband to all areas of the country, CNet reports. The broadband spending is part of a $2.25 trillion infrastructure proposal, which would also include repair of roads and bridges and improvements to the water supply and electrical grids. […]
The post The Week in Internet News: Biden Wants Broadband for All appeared first on Internet Society.
Tools 6. Where are my packets lost? MTR edition.
Hello my friend,
after show pause we continue our blog series about the most popular network troubleshooting tools, which humankind has ever created. Today we’ll take a look at one of the most useful tool to obtain the information about the path between two endpoints and possible packet drops over that path. Ladies and gentlemen, please, welcome MTR.
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retrieval system, or transmitted in any form or by any
means, electronic, mechanical or photocopying, recording,
or otherwise, for commercial purposes without the
prior permission of the author.
Can automation help with figuring what happened where?
In case of the infrastructure problems (networks, servers, VMs, containers), the time matters a lot. The quicker we can find the issue and fix that, the better it will be for our applications and our customers. Automation without doubts one of the key components, which allows you to quickly find and fix your issues.
In our trainings, the Live Network Automation Training (10 weeks) and Automation with Nornir (2 weeks), we explore a lot of real use cases, where the automation helps you to validate the state of you Continue reading
Building Unnumbered Ethernet Lab with netsim-tools
Last week I described the new features added to netsim-tools release 0.4, including support for unnumbered interfaces and OSPF routing. Now let’s see how I used them to build a multi-vendor lab to test which platforms could be made to interoperate when running OSPF over unnumbered Ethernet interfaces.
I needed to define an unnumbered addressing pool first:
addressing:
core:
unnumbered: true
I wanted to run OSPF on all devices in the lab:
module: [ ospf ]