DigiNotar got hacked awhile back. And more and more issues seem to continue to surface as a result (most notably spoofing Google). Read this article for more info on it, but I’m not gonna’ rehash it all right now. Instead, let’s correct it. To do so, we’ll use the security command. Then we’ll use the delete-certificate option along with the -Z operator, which allows inputing (or outputting when installing certificates) a SHA1 has of a certificate. Root Certificates (those that appear under the System Roots section of the Keychain Access application) are all located in the /System/Library/Keychains/SystemRootCertificates.keychain keychain and so we’ll specify that as well:
sudo security delete-certificate -Z C060ED44CBD881BD0EF86C0BA287DDCF8167478C "/System/Library/Keychains/SystemRootCertificates.keychain"
And that’s it, push out the security command through ARD or a policy and you’re untrusting DigiNotar. To verify removal, use the find-certificate option and either attempt to find via the SHA1 hash (-Z again) or use the email address as follows:
security find-certificate -e email@example.com "/System/Library/Keychains/SystemRootCertificates.keychain"
Keep in mind that the certificate can always be re-added to the SystemRootCertificates.keychain when they get all their little issues sorted out.