Expired Certificate may lead to website breakage or other disruptions

guest · Nov 2, 2020

GitHub breaks site layout after forgetting to renew certificate
November 2, 2020
https://www.bleepingcomputer.com/ne...layout-after-forgetting-to-renew-certificate/

This morning, GitHub's pristine layout vanished off of the repository, in what looks like a miss on the company's part in renewing an SSL certificate.

Soon, reports emerged all over the internet from users who had to endure a broken GitHub experience.
The expired certificate prevented numerous resources like images, JavaScript, and CSS stylesheets from correctly loading on GitHub.
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Expired CDN certificate breaks UI, wreaks havoc
Masiur Rahman Siddiki, a web developer tweeted to GitHub, "Seriously ?? Your CDN's SSL Expired ? How on earth is that possible ?"

Because https://github.com is hosted on a secure server with a valid SSL certificate, the website would not automatically pull images from a CDN with an expired SSL certificate, without throwing warnings, or in some cases breaking the website's UI altogether. This is called mixed content problem.

Siddki provided a screenshot of the SSL certificate issued to GitHub's CDN, github.githubassets.com.
The SSL certificate was valid only until November 2, 2020, 7:00 AM ET, after which multiple user reports started emerging on Twitter and Reddit.
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Software developer Janne Varjo tweeted to the company too, stating GitHub had experienced a downtime of about 30 minutes: [...]

"@github's *.githubassets.com SSL cert expired earlier today. The downtime of that domain was about 30 mins until the new cert was deployed. [...]"
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Last week, HP users (myself included) around the world were left unable to print from their Apple devices after their printers' certificates were magically revoked.
Earlier this year, Roku TV channels had ceased to stream after a global certificate expiration issue left consumers in limbo.

While renewing an expired SSL certificate is an easy task, the expirations do cause outages that could have been entirely preventable through adequate planning.
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Expired Certificate may lead to website breakage or other disruptions

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