Let's Encrypt
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Let's Encrypt is a free, automated, and open certificate authority brought to you by the nonprofit Internet Security Research Group (ISRG). Read all about our nonprofit work this year in our 2023 Annual Report.

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  • @[email protected]English
    1•1 month ago

    If one system is somehow compromised, the attacker could effectively impersonate all the systems on your entire domain if they had the wildcard cert. Maybe it’s not a huge deal for individuals but for companies or other organisations it could be extremely dangerous.

    If someone wanted a wildcard cert at work I would be very cautious before I even considered issuing one. Unfortunately there are a few wildcard certs on our domain, but those are from before my time.

    • @[email protected]OPEnglish
      2•1 month ago

      Having a certificate for any subdomain has implications for other sibling domains, even without a wildcard certificate.

      By default, web browsers are a lot less strict about Same Origin Policy for sibling domains, which enables a lot of web-based attacks (like CSRF and cookie stealing) if your able to hijack any subdomain