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Faux Google SSL Certificates Issued By Finance Ministry in France

Dec 10, 2013 By Sarah Vonnegut

Google spoke out this week after security engineers discovered fake SSL certificates linked to a French government agency earlier this month. On December 3rd, security engineers found that a government agency in France was using unauthorized digital certificates on various Google domains, including Gmail, which allowed the agency to act as man-in-the-middle of private domains and sites they did not own.

Google discovered that there were certificates claiming to be Google CA’s, but were, in fact, not owned by them. After Google shut down the certificate and informed the French Network and Information Security Agency, or ANSSI, of the matter, they learned that the French Treasury had been keeping a “close eye” on their employee’s browsing habits, apparently with the employees permission – but not Google’s.

SSL certificates work to verify that a website is what it says it is, binding together the domain with the organization/company and location. Once a secure connection is established, all the web traffic between server and browser is secured. The certificates are issued by either root Certificate Authorities (CA) or intermediate CA’s verified by the root CA, allowing the browser to accept their certificates.

The intermediate CA is granted the authority of the root CA and can be used to sign certificates for domain names that would be trusted in all browsers.  By creating a fake certificate, the hacker can imitate a site (Google, for example,) in order to obtain information that the victim enters in, thinking it’s a legitimate site. That explains one method of Man-in-the-Middle attacks.

Man-in-the-middle attacks are a popular method of hacking, both by cybercriminals and government agencies for surveillance. The NSA, for example, has been involved in man-in-the-middle-attacks in order to circumvent SSL encryption and spy on multinational companies.

The ANSSI issued the following statement about the matter:

“As a result of a human error which was made during a process aimed at strengthening the overall IT security of the French Ministry of Finance, digital certificates related to third-party domains which do not belong to the French administration have been signed by a certification authority of the DGTrésor (Treasury).”

ANSSI went on to say that the issue did not affect the overall security and that they have preemptively revoked the certification power of the Treasury responsible for the error.

Google took the opportunity to promote their Certificate Transparency project, which is working to mend several structural flaws in the SSL certificate system, such as the chain of trust between root and intermediate CA’s. Their new recommended framework would eliminate the issue by auditing certificate’s in real-time, an  that would have immediately shut down the French Treasurys’ certificates had the new framework been in place.

 

Read more:

French Government ANSSI Responsible For A MITM Against Google SSL-TLS – Security Affairs

Further Improving Digital Certificate Security – Google Security Blog

The Certificate Transparency Project by Google

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Sarah is in charge of social media and an editor and writer for the content team at Checkmarx. Her team sheds light on lesser-known AppSec issues and strives to launch content that will inspire, excite and teach security professionals about staying ahead of the hackers in an increasingly insecure world.

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