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mendax writes:

El Reg has published a story which discusses the steps Google and Mozilla are taking, in response to the apparent misuse of a China Internet Network Information Center (CNNIC) intermediate Cetificate Authority (CA) administered by MCS Holdings, who claim it was all just a big mistake.

Firefox-maker Mozilla has joined Google in refusing to recognize SSL certificates issued by the China Internet Network Information Centre (CNNIC).

This should not be a surprise since:

This comes after a security biz in Egypt used a CNNIC-issued intermediate certificate to create unauthorized SSL certs that could be used to trick people into connecting to bogus, password-stealing Gmail.com or Google.com websites.

As a result:

[A]ll Mozilla products – including the Firefox web browser and the Thunderbird email client, among others – will be updated so that all CNNIC-based certificates issued on or after April 1, 2015 are considered untrusted.

Mozilla said it also plans to ask CNNIC for a comprehensive list of all of its current valid certificates. Any certificates issued before April 1 that are not included on this whitelist will also be subject to potential "further action."

Microsoft has also revoked the suspect CNNIC intermediate CA:

Microsoft is updating the Certificate Trust list (CTL) to remove the trust of the subordinate CA certificate. The trusted root Certificate Authority, the China Internet Network Information Center (CNNIC), has also revoked the certificate of the subordinate CA.