Microsoft Security Advisory (2641690)
Fraudulent Digital Certificates Could Allow Spoofing
Published: | Updated:
Microsoft is aware that DigiCert Sdn. Bhd, a Malaysian subordinate certification authority (CA) under Entrust and GTE CyberTrust, has issued 22 certificates with weak 512 bit keys. These weak encryption keys, when broken, could allow an attacker to use the certificates fraudulently to spoof content, perform phishing attacks, or perform man-in-the-middle attacks against all Web browser users including users of Internet Explorer. While this is not a vulnerability in a Microsoft product, this issue affects all supported releases of Microsoft Windows.
DigiCert Sdn. Bhd is not affiliated with the corporation DigiCert, Inc., which is a member of the Microsoft Root Certificate Program.
There is no indication that any certificates were issued fraudulently. Instead, cryptographically weak keys have allowed some of the certificates to be duplicated and used in a fraudulent manner.
Microsoft is providing an update for all supported releases of Microsoft Windows that revokes the trust in DigiCert Sdn. Bhd. The update revokes the trust of the following two intermediate CA certificates:
- Digisign Server ID – (Enrich), issued by Entrust.net Certification Authority (2048)
- Digisign Server ID (Enrich), issued by GTE CyberTrust Global Root
Recommendation. Microsoft recommends that customers apply the update immediately using update management software, or by checking for updates using the Microsoft Update service. Please see the Suggested Actions section of this advisory for more information.
Known Issues. Microsoft Knowledge Base Article 2641690 documents the currently known issues that customers may experience when installing this update. The article also documents recommended solutions for these issues.
For more information about this issue, see the following references:
|Microsoft Knowledge Base Article||2641690|
This advisory discusses the following software and devices.
|Windows XP Service Pack 3|
|Windows XP Professional x64 Edition Service Pack 2|
|Windows Server 2003 Service Pack 2|
|Windows Server 2003 x64 Edition Service Pack 2|
|Windows Server 2003 with SP2 for Itanium-based Systems|
|Windows Vista Service Pack 2|
|Windows Vista x64 Edition Service Pack 2|
|Windows Server 2008 for 32-bit Systems Service Pack 2*|
|Windows Server 2008 for x64-based Systems Service Pack 2*|
|Windows Server 2008 for Itanium-based Systems Service Pack 2|
|Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1|
|Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1|
|Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1*|
|Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1|
*Server Core installation affected. This advisory applies to supported editions of Windows Server 2008 or Windows Server 2008 R2 as indicated, whether or not installed using the Server Core installation option. For more information on this installation option, see the TechNet articles, Managing a Server Core Installation and Servicing a Server Core Installation. Note that the Server Core installation option does not apply to certain editions of Windows Server 2008 and Windows Server 2008 R2; see Compare Server Core Installation Options.
|Windows Mobile 6.x|
|Windows Phone 7|
|Windows Phone 7.5|
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 Web sites provided by program partners, listed in Microsoft Active Protections Program (MAPP) Partners.
- You can provide feedback by completing the Microsoft Help and Support form, Customer Service Contact Us.
- Customers in the United States and Canada can receive technical support from Security Support. For more information about available support options, see Microsoft Help and Support.
- International customers can receive support from their local Microsoft subsidiaries. For more information about how to contact Microsoft for international support issues, visit International Support.
- Microsoft TechNet Security provides additional information about security in Microsoft products.
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.
- V1.0 (November 10, 2011): Advisory published.
- V2.0 (November 16, 2011): Revised to announce the rerelease of the KB2641690 update. See the Update FAQ in this advisory for more information. Also, added link to Microsoft Knowledge Base Article 2641690 under Known Issues in the Executive Summary.
- V3.0 (January 19, 2012): Revised to announce the release of an update for Windows Mobile 6.x, Windows Phone 7, and Windows Phone 7.5 devices.