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Category Archives for "Networking"

New BlueBorne Vulnerability to Bluetooth Devices – What happened and what to do about it

Billions of Bluetooth-enabled devices may be exposed to a new remote attack called “BlueBorne”, even without user interaction or pairing. Affected systems include Windows, iOS (older than iOS 10), the Linux kernel, and Android. What should you do about it?

Bluetooth is ubiquitous, commonly connecting accessories like headsets and keyboards, but is also used throughout the brave new Internet of Things (IoT) world. An attacker exploiting these BlueBorne vulnerabilities can mount a man-in-the-middle attack, or even take control of a device without the user even noticing it.

The vulnerabilities were discovered by a security company called Armis earlier this year. Researchers reached out to the companies responsible for vulnerable implementations that lead to the coordinated disclosure (and patches) on September 12. (You can read more about our views on responsible disclosure and collaborative security in Olaf Kolkman’s blog post here.)

This case once again highlights how crucial it is that software update mechanisms are available to fix vulnerabilities, update configuration settings, and add new functionality to devices. There are challenges, both technological and economic, in having update capabilities ubiquitously deployed, as discussed in the recently published Report from the Internet of Things Software Update (IoTSU) Workshop 2016.

Vulnerabilities Continue reading

Worth Reading: Hunting AdwindRAT

An increasing number of malware families employ SSL/TLS encryption in order to evade detection by Network Intrusion Detection Systems (NIDS). In this blog post I’m gonna have a look at Adwind, which is a cross-platform Remote Access Trojan (RAT) that has been using SSL to conceal it’s traffic for several years. AdwindRAT typically connects SSL sessions to seemingly random TCP ports on the C2 servers. Hence, a heuristic that could potentially be used to hunt for Adwind RAT malware is to look for SSL traffic going to TCP ports that normally don’t use SSL. However, relying on ONLY that heuristic would generate way too many false positives. —Erik Hjelmvik @ Netrecsec

The post Worth Reading: Hunting AdwindRAT appeared first on rule 11 reader.

Penny Pinching With Open Source

You might have seen this Register article this week which summarized a Future:Net talk from Peyton Koran. In the article and the talk, Peyton talks about how the network vendor and reseller market has trapped organizations into a needless cycle of bad hardware and buggy software. He suggests that organizations should focus on their new “core competency” of software development and run whitebox or merchant hardware on top of open source networking stacks. He says that developers can use code that has a lot of community contributions and shares useful functionality. It’s a high and mighty goal. However, I think the open source part of the equation is going to cause some issues.

A Penny For Your Thoughts

The idea behind open source isn’t that hard to comprehend. Everything available to see and build. Anyone can contribute and give back to the project and make the world a better place. At least, that’s the theory. Reality is sometimes a bit different.

Many times, I’ve had off-the-record conversations with organizations that are consuming open source resources and projects as a starting point for building something that will end up containing many proprietary resources. When I ask them about contributing back to Continue reading

LAG vs. ECMP discussion on real network deployments

We discussed LAG (Link Aggregation Group) and the ECMP (Equal Cost Multipath) on real network deployments with the Service Provider/Telco Engineer engineers on my slack group.   I thought it was good discussion so you can see what others are doing and the reasons of their deployments.    In this talk, three people involved. Myself […]

The post LAG vs. ECMP discussion on real network deployments appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

What’s behind the Linux umask?

The Linux umask setting plays a big role in determining the permissions that are assigned to files that you create. But what's behind this variable, and how do the numbers relate to settings like rwxr-xr-x?First, umask is a setting that directly controls the permissions assigned when you create files or directories. Create a new file using a text editor or simply with the touch command, and its permissions will be derived from your umask setting. You can look at your umask setting simply by typing umask on the command line.$ umask 0022 Where the umask setting comes from The umask setting for all users is generally set up in a system-wide file like /etc/profile, /etc/bashrc or /etc/login.defs — a file that's used every time someone logs into the system. The setting can be overidden in user-specific files like ~/.bashrc or ~/.profile since these files are read later in the login process. It can also be reset on a temporary basis at any time with the umask command.To read this article in full or to leave a comment, please click here

What’s behind the Linux umask

The umask setting plays a big role in determining the permissions that are assigned to files that you create. But what's behind this variable and how do the numbers relate to settings like rwxr-xr-x?First, umask is a setting that directly controls the permissions assigned when you create files or directories. Create a new file using a text editor or simply with the touch command and its permissions will be derived from your umask setting. You can look at your umask setting simply by typing umask on the command line.$ umask 0022 Where the umask setting comes from The umask setting for all users is generally set up in a system-wide file like /etc/profile, /etc/bashrc or /etc/login.defs -- a file that's used every time someone logs into the system. The setting can be overidden in user-specific files like ~/.bashrc or ~/.profile since these files are read later in the login process. It can also be reset on a temporary basis at any time with the umask command.To read this article in full or to leave a comment, please click here

Truth Lives in the Open: Lessons from Wikipedia

Victoria Coleman, CTO, Wikimedia Foundation

Moderator: Michelle Zatlyn, Co-Founder & COO, Cloudflare

Photo by Cloudflare Staff

MZ: What is the Wikimedia Foundation?

VC: We pride ourselves in aiming to make available information broadly
not-for-profit

We’re the 5th most visited site on the planet.
We are the guardians of the project. There are 12 projects that we support, Wikipedia is the most prominent but there are others that will be just as influential in the next 5 years: e.g. Wikidata.
299 languages

Let’s also talk about the things that we don’t do: we don’t do editing. We edit as community members but not as members of the foundation.

We don’t monetize our users, content, or presence. We are completely funded by donations, with an average donation of $15.

MZ: If your mission is to help bring free education to all, getting to everyone can be hard. So how do you get access to people in hard-to-reach areas?

VC: It’s definitely a challenge. We built this movement primarily in NA and EU, but our vision goes beyond that. We started doing some critically refined and focused research in Brazil, Mexico, Nigeria.

Trying to understand what global communities need in other Continue reading

Will Data Destroy Democracy?

Lawrence Lessig, Roy L. Furman Professor of Law and Leadership, Harvard Law School and Darren Bolding, CTO, Cambridge Analytica

Moderator: Matthew Prince, Co-Founder & CEO, Cloudflare

Photo by Cloudflare Staff

MP: If there’s one person responsible for the Trump presidency, it seems there is a compelling argument that that might be you.

DB: I very much disagree with that.

MP: How does Cambridge Analytica work, and how did the Trump campaign use it to win the presidency?

DB: we take that data and match it up with lists of voters, and combine that data science to come up with ideas about you who might want to sell a product to, or in teh case of politics, this is this person's’ propensity to vote, this is the candidate they are likely most interested in. WE also do all the digital advertising. By combining data with digital advertising, we have lots of power.

MP: so you don’t want to take credit for having won the election; but the campaign's use of data and targeting was an important factor in the election.

DB: Yes, and what Cambridge did was basically a great turnaround story.

MP: larry you ran a presidential Continue reading

OpenStack SDN – Skydiving Into Service Function Chaining

SFC is another SDN feature that for a long time only used to be available in proprietary SDN solutions and that has recently become available in vanilla OpenStack. It serves as another proof that proprietary SDN solutions are losing the competitive edge, especially for Telco SDN/NFV use cases. Hopefully, by the end of this series of posts I’ll manage do demonstrate how to build a complete open-source solution that has feature parity (in terms of major networking features) with all the major proprietary data centre SDN platforms. But for now, let’s just focus on SFC.

SFC High-level overview

In most general terms, SFC refers to packet forwarding technique that uses more than just destination IP address to decide how to forward packets. In more specific terms, SFC refers to “steering” of traffic through a specific set of endpoints (a.k.a Service Functions), overriding the default destination-based forwarding. For those coming from a traditional networking background, think of SFC as a set of policy-based routing instances orchestrated from a central element (SDN controller). Typical use cases for SFC would be things like firewalling, IDS/IPS, proxying, NAT’ing, monitoring.

SFC is usually modelled as a directed (acyclic) graph, where the first and Continue reading

Napalm Getting Started

Napalm is a network automation library written in python that abstracts the differences between libraries such as Juniper's pyez and Arista's pyeapi bringing a common interface across many API's. Napalm is well supported in the network community, originally started by David Barroso and Elisa...

As Seen on TV

Chris Cantwell, Co-Creator and Show Runner, Halt & Catch Fire

Moderator: John Graham-Cumming, CTO, Cloudflare

Photo by Cloudflare Staff

CC: first off, we have very low ratings! The story came from my father who worked in computers in the early 80s in dallas; later in california. The dynamic between those characters was influenced by my dad.

This was largely a story about reverse engineering. The underdog story was interesting: not Bill Gates, not Silicon Valley, but a different story about the computer world.

JGC: and you managed to do 4 seasons

CC: In four seasons we go from ‘83 to ‘94; we cover everything from small networks to building of internet backbone, rise in search and www

JGC: I watched it before I came; it gave me some bad memories because there were AOL disks

CC: We have an incredible prop team. Some comes from RI computer museum; i have to ask our prop master, he might have manufactured them from images online.

JGC: This is a show about tech but also about money; these people are trying to build companies. The same people trying again and again. Is that a metaphor for recycling something?

CC: Yes, i Continue reading

Private Companies, Public Squares

Daphne Keller, Director, Stanford Center for Internet & Society, and Lee Rowland, Senior Staff Attorney, ACLU Speech, Privacy & Technology Project

Moderator: Matthew Prince, Co-Founder & CEO, Cloudflare

Photo by Cloudflare Staff

MP: Technology and law seem like they are colliding more and more. Tech companies are being asked to regulate content. For a largely non-lawyer audience, give us some foundations about basic rules when you have content on your network?

LR: Communications 2.0 makes the 1st amendment almost quaint. The vast majority of speech that we exchange happens online. When it is hosted by private companies, the 1st amendment doesn’t constrain it. So this is a space governed by norms and individual choices of people like Matthew. In the wake of Cloudflare's decision to take down the Daily Stormer, Matthew penned a piece saying it’s scary that we have this power, and I exercised it. We have a completely unaccountable private medium of communication.

MP: There are shields for companies for this; What is intermediary liability and why is this a position at Google/Stanford?

DK: No one knows what it means; it’s a set of laws that tell platforms when they have to take down Continue reading

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