Mitigating Poisoned PGP Certificates (CVE-2019-13050)

Cert Flooding Featured Image

This article will describe PGP Certificate Flooding attacks as well as inform the reader

How to detect if you have a poisoned certificate in your keyring, How to identify & clean the poisoned cert, and How to update the configuration to prevent it from importing poisoned certs in the future

Last month, an attacker spammed several high-profile PGP certificates with tens of thousands (or hundreds of thousands) of signatures (CVE-2019-13050) and uploaded these signatures to the SKS keyservers.

Without looking very deep, I quickly stumbled on 4 keys that were attacked last month:


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Ephemeral Firefox with Extensions (2/3)

icon of ephemeral firefox with icons of popular extensions below it

I recently posted about how to create a sandboxed firefox profile to compartmentalize (and shred) your firefox browsing history in an Ephemeral Firefox session. But so far I’ve only covered how to create a simple vanilla firefox profile. What if you want your Ephemeral Firefox to include a few basic extensions?

This post will cover how to add extensions to your Ephemeral Firefox profile.


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Ephemeral Firefox in Ubuntu (1/3)

ephemeral firefox

This post will describe how to create an Ephemeral Firefox session. The ultimate goal of an Ephemeral Firefox session is to unlink your browsing sessions day-to-day and reduce tracking via fingerprinting.

This technique can also be used to compartmentalize your internet activity by using the Ephemeral Firefox session as a Site Specific Browser. This can be especially useful for websites that are infamous for tracking users across the internet and selling the data they collect. For example, you can blacklist all facebook domains in your main browser and only use Ephemeral Firefox sessions that have been whitelisted exclusively for facebook domains–effectively compartmentalizing your facebook activity from the rest of your internet activity.

Another great use-case for an Ephemeral Firefox is for public access computers such as those at libraries, hotels, and printing shops.


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How to check Whonix version in Qubes

Whonix 14 just came out last month. I went to update, but I couldn’t figure out what version I was currently running. The documentation said to run this command, but the output didn’t make sense when I ran it on my whonix-gw TemplateVM.


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Detect outgoing port blocking with nmap and portquiz.net

This post will describe how to detect if your network is blocking outgoing ports. In this test, we’ll be using nmap and the fine website portquiz.net


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New Thumb Drive Encryption Procedure

In this article, I’ll describe a procedure for preparing a brand-new USB flash drive for use. First we’ll securely erase all the data on the drive, then we’ll encrypt the entire drive, and–finally–we’ll check the drive for bad blocks.

Ah, remember the good-ole days of spinning disks? When your OS could tell your hard *disk* to shred a specific sector? Like it or not, those days are gone in the land of USB flash volumes.

There’s a lot of great reads on the complications of securely erasing data on a USB thumb drive. Unfortunately, a lot of the techniques are not universal to all technologies or manufacturers. Consequently, my approach is more ignorant, straight-forward, and broad (at the risk of causing these cheap usb drives to fail sooner & the process taking longer):

First, I make sure never to write any unencrytped data to the disk Second, when I want to wipe the disk, I fill it entirely with random data

Below are the commands that I use to prepare a new usb drive for my use immediately after purchase. These commands are presented as a rough guide; they’re mostly idempotent, but you probably want to copy & paste them
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How to check the Public Key Algorithm used for a given gpg key (ie: RSA vs DSA)

Today I discovered how to validate the Public Key Algorithm that’s used for a given gpg key. Unfortunately, it’s extremely unintuitive & took quite a bit of digging to figure out how. So I’m leaving this here in hopes it helps someone in their future searches.


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Howto Guide: Whole House VPN with Ubiquiti + Cryptostorm (netflix safe!)

This post will describe what hardware to buy & how to configure it so that you have 2 wireless networks in your house: One that seamlessly forces all of the traffic on that network through a VPN–and one that connects to the Internet normally . When finished, the internet activity for any device connected to the first network will be entirely encrypted so that the ISP cannot see which websites are visited*, what software you use, and what information you send & receive on the internet.

* Assuming your config doesn’t leak DNS; see improvements section

Update 2017-08-25: Added “kill switch” firewall rule that prevents LAN traffic from escaping to the ISP unless it passed through the VPN’s vtun0 interface first. Following this change, if the VPN connection is down, the internet will not be accessible (as desired) over the ‘home’ wifi network (without this, the router bypasses the VPN by sending the packets straight to the ISP–giving a false sense of privacy).

Why

In April 2017, Trump signed Bill S.J.Res.34, which repeals the Broadband Consumer Privacy Proposal from October 2016. This enormous step backwards permits anyone’s ISP to sell their Internet activity. The EFF put it best:

companies
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Tor->VPN in TAILS to bypass tor-blocking

This post will describe how to route outgoing traffic in a python script running on TAILS first through Tor, then through a SOCKS proxy created with an ssh tunnel. This is helpful when you want to use the anonymizing capabilities of tor, but you need to access a website that explicitly blocks tor exit nodes (common with sites running CloudFlare on default settings).


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