Today, Microsoft has issued an emergency update for almost all versions
of Windows and also for Microsoft devices running Windows Phone 8 and
8.1 to secure users from attacks that abuse the latest issued rogue SSL
certificates, which could be used to impersonate Google and Yahoo!
websites.
A week after the search engine giant Google spotted and blocked
unauthorized digital certificates for a number of its domains that could
result in a potentially serious security and privacy threat, Microsoft
has responded back to block the bogus certificates from being used on
its software as well.
"Today, we are updating the Certificate Trust List (CTL) for all
supported releases of Microsoft Windows to remove the trust of
mis-issued third-party digital certificates," said Dustin Childs, group manager of response communications.
The fake digital certificates,
issued by the National Informatics Centre (NIC) of India - a unit of
India’s Ministry of Communications and Information Technology, were
uncovered at the beginning of this month by Google's security team.
Microsoft officials warned the country's certification authorities as
well as Microsoft, because the certificates issued by NIC are included
in the Microsoft Root Store and so are trusted by a large number of
applications running on Windows, including Internet Explorer and Chrome.
Yet, Microsoft is not aware of any kind of attack leveraging this issue,
but millions of websites operated by banks, e-commerce companies and
other types of online services make use of such kind of cryptographic
credentials to encrypt the web traffic and prove the authenticity of
their servers.
"These SSL certificates could be used to spoof content, perform phishing attacks, or perform man-in-the-middle attacks against Web properties," a Microsoft advisory warned. "The subordinate CAs may also have been used to issue certificates for other, currently unknown sites, which could be subject to similar attacks."
The Certificate Trust list (CTL) update has been rolled out to all users
who have automatic updates enabled, and for those who do not have the
automatic updater of revoked certificates installed, Microsoft has
released a patch that can be manually installed.
The emergency update addresses all Microsoft PC operating systems
including Windows Vista, Windows version 8, 8.1, RT, RT 8.1, Server
2012, Server 2012 R2, and its Windows Phone 8 software. At this moment,
there is no update available for systems running Windows Server 2003 to
revoke the fraudulent certificates – Microsoft says it will issue an
update as soon as one becomes available. Also Server 2003 support ends
next year, but the company will provide a fix before then.