Issue References

For more information about this issue, see the following references:

This advisory discusses the following software.

Why was this advisory updated on July 17, 2014?
The advisory was updated on July 17, 2014 to announce the availability of update 2982792 for supported editions of Windows Server 2003. For more information see the Suggested Actions section of this advisory.

What is the scope of the advisory?
The purpose of this advisory is to notify customers that National Informatics Centre (NIC) improperly issued SSL certificates for multiple sites including Google web properties. These SSL certificates could be used to spoof content, perform phishing attacks, or perform man-in-the-middle attacks against web properties. The subordinate CA may also have been used to issue certificates for other, currently unknown sites, which could be subject to similar attacks.

What caused the issue?
A subordinate CA certificate was improperly issued by the National Informatics Centre (NIC), subordinated to the Government of India CA, which is a CA present in the Trusted Root Certification Authorities Store.

Does this update address any other digital certificates?
Yes, in addition to addressing the certificates described in this advisory, this update is cumulative and includes digital certificates described in previous advisories:

• Microsoft Security Advisory 2524375
• Microsoft Security Advisory 2607712
• Microsoft Security Advisory 2641690
• Microsoft Security Advisory 2718704
• Microsoft Security Advisory 2728973
• Microsoft Security Advisory 2798897
• Microsoft Security Advisory 2961552

What is cryptography?
Cryptography is the science of securing information by converting it between its normal, readable state (called plaintext) and one in which the data is obscured (known as ciphertext).

In all forms of cryptography, a value known as a key is used in conjunction with a procedure called a crypto algorithm to transform plaintext data into ciphertext. In the most familiar type of cryptography, secret-key cryptography, the ciphertext is transformed back into plaintext using the same key. However, in a second type of cryptography, public-key cryptography, a different key is used to transform the ciphertext back into plaintext.

What is a digital certificate?
In public-key cryptography, one of the keys, known as the private key, must be kept secret. The other key, known as the public key, is intended to be shared with the world. However, there must be a way for the owner of the key to tell the world who the key belongs to. Digital certificates provide a way to do this. A digital certificate is a tamperproof piece of data that packages a public key together with information about it (who owns it, what it can be used for, when it expires, and so forth).

What are certificates used for?
Certificates are used primarily to verify the identity of a person or device, authenticate a service, or encrypt files. Normally you wont have to think about certificates at all. You might, however, see a message telling you that a certificate is expired or invalid. In those cases you should follow the instructions in the message.

What is a certification authority (CA)?
Certification authorities are the organizations that issue certificates. They establish and verify the authenticity of public keys that belong to people or other certification authorities, and they verify the identity of a person or organization that asks for a certificate.

What is a Certificate Trust List (CTL)?
A trust must exist between the recipient of a signed message and the signer of the message. One method of establishing this trust is through a certificate, an electronic document verifying that entities or persons are who they claim to be. A certificate is issued to an entity by a third party that is trusted by both of the other parties. So, each recipient of a signed message decides if the issuer of the signer's certificate is trustworthy. CryptoAPI has implemented a methodology to allow application developers to create applications that automatically verify certificates against a predefined list of trusted certificates or roots. This list of trusted entities (called subjects) is called a certificate trust list (CTL). For more information, please see the MSDN article, Certificate Trust Verification.

What might an attacker do with these certificates?
An attacker could use these certificates to spoof content, perform phishing attacks, or perform man-in-the-middle attacks against the following web properties:

• google.com
• mail.google.com
• gmail.com
• www.gmail.com
• m.gmail.com
• smtp.gmail.com
• pop.gmail.com
• imap.gmail.com
• googlemail.com
• www.googlemail.com
• smtp.googlemail.com
• pop.googlemail.com
• imap.googlemail.com
• gstatic.com
• ssl.gstatic.com
• www.static.com
• encrypted-tbn1.gstatic.com
• encrypted-tbn2.gstatic.com
• login.yahoo.com
• mail.yahoo.com
• mail.yahoo-inc.com
• fb.member.yahoo.com
• login.korea.yahoo.com
• api.reg.yahoo.com
• edit.yahoo.com
• watchlist.yahoo.com
• edit.india.yahoo.com
• edit.korea.yahoo.com
• edit.europe.yahoo.com
• edit.singapore.yahoo.com
• edit.tpe.yahoo.com
• legalredirect.yahoo.com
• me.yahoo.com
• open.login.yahooapis.com
• subscribe.yahoo.com
• edit.secure.yahoo.com
• edit.client.yahoo.com
• bt.edit.client.yahoo.com
• verizon.edit.client.yahoo.com
• na.edit.client.yahoo.com
• au.api.reg.yahoo.com
• au.reg.yahoo.com
• profile.yahoo.com
• static.profile.yahoo.com
• openid.yahoo.com

What is a man-in-the-middle attack?
A man-in-the-middle attack occurs when an attacker reroutes communication between two users through the attackers computer without the knowledge of the two communicating users. Each user in the communication unknowingly sends traffic to and receives traffic from the attacker, all the while thinking they are communicating only with the intended user.

What is Microsoft doing to help with resolving this issue?
Although this issue does not result from an issue in any Microsoft product, we are nevertheless updating the CTL and providing an update to help protect customers. Microsoft will continue to investigate this issue and may make future changes to the CTL or release a future update to help protect customers.

After applying the update, how can I verify the certificates in the Microsoft Untrusted Certificates Store?
For Windows Vista, Windows 7, Windows Server 2008, and Windows Server 2008 R2 systems that are using the automatic updater of revoked certificates (see Microsoft Knowledge Base Article 2677070 for details), and for Windows 8, Windows 8.1, Windows RT, Windows RT 8.1, Windows Server 2012, and Windows Server 2012 R2 systems, you can check the Application log in the Event Viewer for an entry with the following values:

• Source: CAPI2
• Level: Information
• Event ID: 4112
• Description: Successful auto update of disallowed certificate list with effective date: Thursday, July 3, 2014 (or later).

For systems not using the automatic updater of revoked certificates, in the Certificates MMC snap-in, verify that the following certificate has been added to the Untrusted Certificates folder:

Note For information on how to view certificates with the MMC Snap-in, see the MSDN article, How to: View Certificates with the MMC Snap-in.

Apply the update for supported releases of Microsoft Windows

An automatic updater of revoked certificates is included in supported editions of Windows 8, Windows 8.1, Windows RT, Windows RT 8.1, Windows Server 2012, and Windows Server 2012 R2, and for devices running Windows Phone 8 or Windows Phone 8.1. For these operating systems or devices, customers do not need to take any action because the CTL will be updated automatically.

For systems running Windows Vista, Windows 7, Windows Server 2008, or Windows Server 2008 R2 that are using the automatic updater of revoked certificates (see Microsoft Knowledge Base Article 2677070 for details), customers do not need to take any action because the CTL will be updated automatically.

For systems running Windows Vista, Windows 7, Windows Server 2008, or Windows Server 2008 R2, and that do not have the automatic updater of revoked certificates installed, this update is not available. To receive this update, customers must install the automatic updater of revoked certificates (see Microsoft Knowledge Base Article 2677070 for details). Customers in disconnected environments and who are running Windows Vista, Windows 7, Windows 8, Windows Server 2008, Windows Server 2008 R2, or Windows Server 2012 can install update 2813430 to receive this update (see Microsoft Knowledge Base Article 2813430 for details).

For customers running Windows Server 2003, Microsoft recommends that the 2982792 update be applied immediately using update management software, by checking for updates using the Microsoft Update service, or by downloading and applying the update manually. See Microsoft Knowledge Base Article 2982792 for download links.

Additional Suggested Actions

• Protect your PC

  We continue to encourage customers to follow our Protect Your Computer guidance of enabling a firewall, getting software updates and installing antivirus software. For more information, see Microsoft Safety & Security Center.

• Keep Microsoft Software Updated

  Users running Microsoft software should apply the latest Microsoft security updates to help make sure that their computers are as protected as possible. If you are not sure whether your software is up to date, visit Microsoft Update, scan your computer for available updates, and install any high-priority updates that are offered to you. If you have automatic updating enabled and configured to provide updates for Microsoft products, the updates are delivered to you when they are released, but you should verify that they are installed.

Microsoft thanks the following for working with us to help protect customers:

• Adam Langley and the Google Chrome Security Team for bringing the incident to our attention and working with us on the response

Microsoft Active Protections Program (MAPP)

To improve security protections for customers, Microsoft provides vulnerability information to major security software providers in advance of each monthly security update release. Security software providers can then use this vulnerability information to provide updated protections to customers via their security software or devices, such as antivirus, network-based intrusion detection systems, or host-based intrusion prevention systems. To determine whether active protections are available from security software providers, please visit the active protections websites provided by program partners, listed in Microsoft Active Protections Program (MAPP) Partners.

Feedback

• You can provide feedback by completing the Microsoft Help and Support form, Customer Service Contact Us.

Support

• Customers in the United States and Canada can receive technical support from Security Support. For more information, see Microsoft Help and Support.
• International customers can receive support from their local Microsoft subsidiaries. For more information, see International Support.
• Microsoft TechNet Security provides additional information about security in Microsoft products.

Disclaimer

The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

Revisions

• V1.0 (July 10, 2014): Advisory published.
• V2.0 (July 17, 2014): Advisory revised to announce the availability of update 2982792 for supported editions of Windows Server 2003. For more information, see the Suggested Actions section of this advisory.