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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  • lud@lemm.eeEnglish
    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.

    • pcouy@lemmy.pierre-couy.frOPEnglish
      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