US-CERT is aware of public reports of the existence of at least one fraudulent SSL certificate issued by DigiNotar. This fraudulent SSL certificate could be used by an attacker to masquerade as any subdomain of google.com.

Mozilla will be releasing new versions of Firefox for desktop (3.6.21, 6.0.1, 7, 8, and 9) and mobile (6.0.1, 7, 8, and 9). Additional information can be found in the Mozilla Security Blog.

Microsoft has removed the DigiNotar root certificate from the Microsoft Certificate Trust List. This change affects all versions of Windows Vista, Windows 7, Windows Server 2008, and Windows Server 2008 R2.  Microsoft will be releasing a future update for Windows XP and Windows Server 2003 to address this issue.  Additional information can be found in Microsoft Security Advisory 2607712.

US-CERT encourages users and administrators to apply any necessary updates to help mitigate the risks. US-CERT will provide additional information as it becomes available.

Read more: US-CERT Current Activity