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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘TLS’ Category

The browser wars that started on iOS (forcing Safari) and Android (forcing Chrome) now are continued on Windows 11 (forcing Edge)

Posted by jpluimers on 2021/10/05

Via:

 

Posted in Awareness, Development, HTTP, Internet protocol suite, Software Development, TCP, TLS, URI, Web Development | Leave a Comment »

One of the Let’s Encrypt’s Root Certificates expired today (and their corresponding intermediate yesterday); how is your infrastructure doing?

Posted by jpluimers on 2021/09/30

Last weekend I published 5 days before the Let’s Encrypt’s Root Certificate is expiring!

It basically was a post trying to amplify the [Wayback/Archive.isLet’s Encrypt’s Root Certificate is expiring! message by [WaybackScott Helme .

Yesterday and today, he is maintaining a Twitter thread on things that have broken.

Quite a few things have, including some versions of curl, on which a lot of infrastructure relies (the certificate for it got fixed later on 20120930), see:

Two important starting points in his thread:

  1. [Archive.is] Scott Helme on Twitter: “🚨🚨🚨 5 minutes until the Let’s Encrypt R3 intermediate expires 🚨🚨🚨 29 September 2021 19:21:40 UTC”
  2. [Archive.is] Scott Helme on Twitter: “🚨🚨🚨 30 minute warning 🚨🚨🚨 IdentTrust DST Root CA X3 Expires: Sep 30 14:01:15 2021 UTC… “

If you want to check from one of your own clients, try [Archive.is] Scott Helme on Twitter: “I’ve created a test site to help identify issues with clients. If you can connect to https://t.co/bXHsnlRk8D then your client can handle being served the expired R3 Intermediate in the server chain!… “

[Wayback/Archive.is] https://expired-r3-test.scotthelme.co.uk/

Note that neither SSLabs, nor Cencys, nor CertCheckkerApp do show the expired certificate, only the new one:

Yes, I know the pluimers.com web server is rated B from a TLS perspective. Will be working on it, but I’m still recovering from rectum cancer treatments, and have an almost 1.5 year backlog to get through.

–jeroen

Posted in Communications Development, Development, Encryption, HTTP, https, HTTPS/TLS security, Internet protocol suite, Let's Encrypt (letsencrypt/certbot), Power User, Security, Software Development, TCP, TLS, Uncategorized, Web Development | Leave a Comment »

5 days before the Let’s Encrypt’s Root Certificate is expiring!

Posted by jpluimers on 2021/09/24

Only 5 days left to take a close look at both your web-clients (including back-end clients!) and servers to prevent potential Let’s Encrypt mayhem.

Last week, [Wayback] Scott Helme published about [Wayback/Archive.is] Let’s Encrypt’s Root Certificate is expiring!

Let’s Encrypt has done loads of work over the past lustrum to prevent trouble like cross-signing, issuing the successor certificates, and more.

The problem is that people like you and me have refrained from keeping their clients and servers up-to-date, so some security issues will occur. Hopefully they are limited to non-functioning communication and not leaking of data.

It is about this DST Root CA X3 certificate, used by the vast majority of Let’s Encrypt certificates, [Wayback/Archive.is] Certificate Checker: CN=DST Root CA X3, O=Digital Signature Trust Co.:

DST Root CA X3
Certificate Trusted anchor certificate
Subject DN CN=DST Root CA X3, O=Digital Signature Trust Co.
Issuer DN CN=DST Root CA X3, O=Digital Signature Trust Co.
Serial Number 44AFB080D6A327BA893039862EF8406B
Valid  to  Key RSAPublicKey (2048 bit)
SHA1 Hash DAC9024F54D8F6DF94935FB1732638CA6AD77C13 MD5 Hash 410352DC0FF7501B16F0028EBA6F45C5
SKI C4A7B1A47B2C71FADBE14B9075FFC41560858910 AKI

Quoting Scott, these clients likely will fail, so need attention:

  • OpenSSL <= 1.0.2
  • Windows < XP SP3
  • macOS < 10.12.1
  • iOS < 10 (iPhone 5 is the lowest model that can get to iOS 10)
  • Android < 7.1.1 (but >= 2.3.6 will work if served ISRG Root X1 cross-sign)
  • Mozilla Firefox < 50
  • Ubuntu < 16.04
  • Debian < 8
  • Java 8 < 8u141
  • Java 7 < 7u151
  • NSS < 3.26
  • Amazon FireOS (Silk Browser)

On the server side, you can help Android devices by using a Let’s Encrypt certificate that is cross-signed with the ISRG Root X1 certificate [Wayback/Archive.is] Certificate Checker: CN=ISRG Root X1, O=Internet Security Research Group, C=US:

ISRG Root X1
Certificate
Subject DN CN=ISRG Root X1, O=Internet Security Research Group, C=US
Issuer DN CN=DST Root CA X3, O=Digital Signature Trust Co.
Serial Number 4001772137D4E942B8EE76AA3C640AB7
Valid  to  Key RSAPublicKey (4096 bit)
SHA1 Hash 933C6DDEE95C9C41A40F9F50493D82BE03AD87BF MD5 Hash C1E1FF07F9F688498274D1A18053EABF
SKI 79B459E67BB6E5E40173800888C81A58F6E99B6E AKI C4A7B1A47B2C71FADBE14B9075FFC41560858910

Via [Archive.is] Scott Helme on Twitter: “There are only 10 days left until the Let’s Encrypt root certificate expires and there are still questions over what the impact will be! Full details here: …” which links to the above article showing a nice graph of the current Let’s Encrtypt root certificate setup:

–jeroen

Posted in Communications Development, Development, Encryption, https, HTTPS/TLS security, Internet protocol suite, Let's Encrypt (letsencrypt/certbot), Power User, Security, Software Development, TCP, TLS, Web Development | Leave a Comment »

Tricks used by software developers to https://127.0.0.1

Posted by jpluimers on 2021/09/07

Long interesting thread at [WayBack] Thread by @sleevi_: “@SwiftOnSecurity So, some history: It used to be folks would get certs for “localhost”, just like they would from “webmail”, despite no CA e […]”

In  2019, applications were still using tricks (including shipping private keys!) to “securely” access https://127.0.0.1 on some port.

This should have stopped in 2015, but hadn’t. I wonder how bad it still is today.

Related:

Read the rest of this entry »

Posted in Communications Development, Development, DNS, HTTP, Internet, Power User, Software Development, TCP, TLS | Leave a Comment »

For my link archive: DNS over https

Posted by jpluimers on 2021/09/02

DNS over HTTPS

For my link archive:

JSON DNS output

Some DNS over HTTSP providers support dns-json, which Cloudflare delivers non-pretty printed.

To pretty print in the same order as the input, pipe through json_pp or python -m json.tool which however will sort (either alphabetically or by dictionary hash) the output.

If you like jq and colourised output, then you can pipe through jq .  as well  (which does not sort the nodes).

Piping curl output requires the curl --silent parameter to suppress progress reporting.

See these for more information:

Example:

Read the rest of this entry »

Posted in Communications Development, Development, DNS, HTTP, Internet, Internet protocol suite, Power User, Software Development, TCP, TLS | Leave a Comment »

 
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