The Wiert Corner – irregular stream of stuff

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

  • My badges

  • Twitter Updates

  • My Flickr Stream

  • Pages

  • All categories

  • Enter your email address to subscribe to this blog and receive notifications of new posts by email.

    Join 1,839 other subscribers

Archive for the ‘Power User’ Category

ACME TLS-SNI-01 validation disabled due to vulnerability – Incidents – Let’s Encrypt Community Support

Posted by jpluimers on 2018/01/11

Now that so many sites depend on LetsEncrypt: maybe it is time for a second one.

We’ve received a credible report of a problem with ACME TLS-SNI-01 validation which could allow people to get certificates they should not be able to get. While we investigate further we have disabled tls-sni-01 validation. We’ll post more information soon.

Source: [Archive.isACME TLS-SNI-01 validation disabled due to vulnerability – Incidents – Let’s Encrypt Community Support

Via:

–jeroen

Posted in Encryption, Let's Encrypt (letsencrypt/certbot), Power User, Security | Leave a Comment »

A way to bypass a Chrome interstitial page is to type a secret keyword…

Posted by jpluimers on 2018/01/10

Some sites do not have their TLS security set- up correctly. You can get around the page that Chrome then displays. This is called the “interstitial bypass”, you should use it with great care (not like one of the sites I visited a year ago that got themselves a nice ransomware attack), for instance on machines you can dispose off.

The mechanism has changed over time, from a simple button to a passphrase that changes every now and then.

Some historic links on this:

Via:

A way to bypass a Chrome interstitial page is to type a secret keyword. Until today, this not-no-secret keyword was “badidea”. And it just changed. So h… – François Beaufort – Google+

–jeroen

Read the rest of this entry »

Posted in Chrome, Google, Power User | Leave a Comment »

SSLLabs security reports for some embarcadero subdomains

Posted by jpluimers on 2018/01/09

I hope this is a coincidence. Before Nick Hodges left, the TLS security of the various embarcadero https servers was increased, most from grade F. Now they might soon be grade F again.

Hopefully somebody in IT has time to take a renewed look as security needs constant attention.

I’ve only included a fraction of their sub-domains, as really this is a job for the Embarcadero IT department.

Related:

Posted in Encryption, HTTPS/TLS security, Power User, Security | Leave a Comment »

Zabbix: better “Disk space usage” graphs for Windows systems

Posted by jpluimers on 2018/01/09

The default [WayBack] Zabbix Disk space usage graph (named Disk space usage {#FSNAME}) for Windows looks like this:

Total disk space on C:

Total disk space on C:

What I want is a graph over time. Based on that, I can start working on different triggers than the default “less than 20% free space available“, for instance:

So I want graphs similar to the CPU load (in the graph itself called Processor load) graph which looks like this:

CPU load (a.k.a. Processor load) is actually graphed

CPU load (a.k.a. Processor load) is actually graphed “over time”

It is part of the Graph prototypes for the Template OS Windows discovery list Mounted filesystem discovery:

For now I’ve added this graph prototype as Line chart with 95th percentile:

If that work, I can start working on the triggers:

–jeroen

Posted in *nix, Monitoring, Power User, Zabbix | 2 Comments »

Bol.com E-waste: recycling old electronics

Posted by jpluimers on 2018/01/08

I know Dutch electronics companies are obliged to provides this service, but bol.com makes it really easy:

Lever je oude apparaat kosteloos in bij bol.com en wij verwerken het op een milieuvriendelijke manier. Zorg ervoor dat het klein elektrisch apparaat geen vloeistoffen en vetten meer bevat. Verpak het tot een stevig pakket en vermeld het bestelnummer van je nieuwe artikel in de linkerbovenhoek en onderstaand adres:

Bol.com E-waste
Antwoordnummer 2002
2130 RH Hoofddorp

–jeroen

Posted in LifeHacker, Power User | Leave a Comment »

Chrome on Mac OS X keeps all old versions it ever installed…

Posted by jpluimers on 2018/01/08

Like many, I’m a digital packrat. Somehow all your storage space somehow becomes full over time. But sometimes that’s not because just you are a digital packrat. Applications can be digital packrats too.

Chrome is such an example as on Mac OS X it will keep every prior version filed under /Applications/Google Chrome.app/Contents/Versions. In my case GrandPerspective showed it as one big blob of close 20 gigabyte. Which is odd as the download itself is was slightly short of 20 gigabyte of Chrome versions.

There are various ways to clean up this by script, but I find the easiest to do this in Finder:

  1. From Grand Perspective, right click the entry, then choose “Reveal in Finder”
  2. In Finder, right click the entry, then choose “Show Package Contents”
  3. In Finder, with the expanded “Contents” folder, browse to the “Versions” folder and expand it.
  4. From Finder, delete unwanted versions.

–jeroen

References:

Posted in Apple, Power User | Leave a Comment »

1984 and (IT) (in)security – lots of Spectre / Meltdown links

Posted by jpluimers on 2018/01/07

Over the last few days I’ve collected a lot of Meltdown and Spectre links at 1984 and (IT) (in)security – Google+.

Most of them provide links to what happened this, year, but a few are also on the path leading to these vulnerabilities. In the links you will also find the affected architectures and patches by various vendors which I have tried to summarise below.

In the link collection, I’ve tried to keep the number of hops to the actual sources as short as possible (as many have re-shared original) links but still attribute to the first one I got the link from.

Since the WordPress “Press-This” functionality is limited, even after all these years, so for now it will be a one-time link dump; filling in more of the archival WayBack and Archive.is links and adding more context will hopefully come later.

I will try to keep links roughly in chronological order (please post a comment where I goofed up) and I hope to find some time to have a “most important” or “summary” list eventually.

A few notes first

Remember:

  • There are 2 hard problems in computer science: cache invalidation, naming things, and off-by-1 errors.

    via: [WayBackTwoHardThings There are only two hard things in Computer Science: cache invalidation and naming things — Phil Karlton (bonus variations on the page)

  • Caching is the root of all evil.

List

Read the rest of this entry »

Posted in Power User, Security | Leave a Comment »

Private keys in software from Blizzard, Electronic Arts, Microsoft, and the German Federal Bar (Bulletproof TLS Newsletter Issue #36)

Posted by jpluimers on 2018/01/07

In the blast of Spectre and Meltdown, don’t forget that humans still goof up: [WayBackPrivate keys in software from Blizzard, Electronic Arts, Microsoft, and the German Federal Bar (Bulletproof TLS Newsletter Issue #36).

Luckily enough people keep an eye on these too.

Via:

–jeroen

Posted in Power User, Security | Leave a Comment »

“simply” hold the refresh button and then tap on Request Desktop Site – How to Use WhatsApp on iPad

Posted by jpluimers on 2018/01/05

… simply hold the refresh button and then tap on Request Desktop Site. The page should refresh and you should be redirected to web.whatsapp.com and you should be looking at a QR code on the screen of your iPad.

If you know it’s “simply”.

Source: How to Use WhatsApp on iPad

–jeroen

Posted in Apple, iOS, iPad, Power User | Leave a Comment »

Fixing PowerPoint Annoyances: When I double-click a .pps/.ppx file, the PowerPoint icon appear on the taskbar…

Posted by jpluimers on 2018/01/05

From [WayBack1. Presenting Your Presentation – Fixing PowerPoint Annoyances [Book]:

PowerPoint Opens Minimized

THE ANNOYANCE: I can’t get my presentation to open properly when I double-click it. I can see the PowerPoint icon on the taskbar, but it won’t maximize or restore. How can I view the presentation?

THE FIX: Your slide show is set to display on the secondary monitor, which is no longer attached to your computer. Open PowerPoint from Start → Program Files and select File → Open to open your presentation. Then select Slide Show → Set up Show and choose “Display slide show on primary monitor.”

–jeroen

Posted in Office, Power Point, Power User | Leave a Comment »