On Friday, March 20th, we became aware of unauthorized digital certificates for several Google domains. The certificates were issued by an intermediate certificate authority apparently held by a company called MCS Holdings. This intermediate certificate was issued by CNNIC.
more here......http://googleonlinesecurity.blogspot.com/2015/03/maintaining-digital-certificate-security.html
more here......http://googleonlinesecurity.blogspot.com/2015/03/maintaining-digital-certificate-security.html