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Lock me now certificate revoked3/30/2023 OneCRL is a list of intermediate certificates that have been revoked by CAs in Mozilla’s root program, and is pushed to Firefox users in application updates. ![]() Like Google, Mozilla maintains a centralized list of revoked certificates, called OneCRL. This article provides high-level summaries of the validation-checking strategies employed by major desktop browsers ( Chrome, Firefox, Safari, and Edge), and compares the responses of these browsers to some sample revoked certificates hosted by SSL.com. The exact details vary between providers, but these solutions generally involve harvesting lists of revoked certificates from certificate authorities (CAs) and pushing them to browsers. (For a more complete history of this issue, please read SSL.com’s article, Page Load Optimization: OCSP Stapling).įor these reasons, web browsers have implemented a range of solutions to reduce or eliminate the need for online revocation checking. ![]() Because online OCSP queries fail so often and are impossible in some situations (such as with captive portals), browsers generally implement OCSP checking in “soft-fail” mode, rendering it ineffective at deterring a determined attacker. ![]() Unless a server is configured to use OCSP Stapling, online revocation checking by web browsers is both slow and privacy-compromising. Checking the revocation status of SSL/TLS certificates presented by HTTPS websites is an ongoing problem in web security.
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