Firefox Users Fingerprinted via Cached Intermediate CA Certificates

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An attacker can discover various details about Firefox users due to the manner in which the browser caches intermediate CA certificates, a researcher has discovered.

When the server doesn’t deliver the complete certificate chain, Firefox loads the website if the intermediate CA certificate is cached, security researcher Alexander Klink discovered. By determining which websites use the same intermediate, an attacker could figure out some details about the user, the researcher says.

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