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Google Online Security Blog: November 2008
Security Blog
The latest news and insights from Google on security and safety on the Internet
Gmail security and recent phishing activity
November 25, 2008
Posted by Chris Evans
We've seen some speculation recently about a purported security vulnerability in Gmail and the theft of several website owners' domains by unauthorized third parties. At Google we're committed to providing secure products, and we mounted an immediate investigation. Our results indicate no evidence of a Gmail vulnerability.
With help from affected users, we determined that the cause was a phishing scheme, a common method used by malicious actors to trick people into sharing their sensitive information. Attackers sent customized e-mails encouraging web domain owners to visit fraudulent websites such as "google-hosts.com" that they set up purely to harvest usernames and passwords. These fake sites had no affiliation with Google, and the ones we've seen are now offline. Once attackers gained the user credentials, they were free to modify the affected accounts as they desired. In this case, the attacker set up mail filters specifically designed to forward messages from web domain providers.
Several news stories referenced a
domain theft from December 2007
that was incorrectly linked to a Gmail CSRF vulnerability. We did have a Gmail CSRF bug reported to us in September 2007 that we fixed worldwide within 24 hours of private disclosure of the bug details. Neither this bug nor any other Gmail bug was involved in the December 2007 domain theft.
We recognize how many people depend on Gmail, and we strive to make it as secure as possible. At this time, we'd like to thank the wider security community for working with us to achieve this goal. We're always looking at new ways to enhance Gmail security. For example, we recently gave users the option to
always run their entire session using https
.
To keep your Google account secure online, we recommend you only ever enter your Gmail sign-in credentials to web addresses starting with https://www.google.com/accounts, and never click-through any warnings your browser may raise about certificates. For more information on how to stay safe from phishing attacks, see our blog post
here
.
OAuth for Secure Mashups
November 18, 2008
Posted by Eric Sachs, Senior Product Manager, Google Security
A year ago, a number of large and small websites announced a new open standard called
OAuth
. This standard is designed to provide a secure and privacy-preserving technique for enabling specific private data on one site to be accessed by another site. One popular reason for that type of cross-site access is data portability in areas such as personal health records (such as Google Health or Microsoft Healthvault), as well as social networks (such as OpenSocial enabled sites). I originally became involved in this space in the summer of 2005, when Google started developing a feature called
AuthSub
, which was one of the pre-cursors of OAuth. That was a proprietary protocol, but one that has been used by hundreds of websites to provide add-on services to Google Account users by getting permission from users to access data in their Google Accounts. In fact, that was the key feature that a few of us used to start the Google Health portability effort back when it was only a prototype project with a few dedicated Googlers.
However, with the development of a common Internet standard in OAuth, we see much greater potential for data portability and secure mash-ups. Today we
announced
that the gadget platform now supports OAuth, and the interoperability of this standard was demonstrated by new iGoogle gadgets that AOL and MySpace both built to enable users to see their respective AOL or MySpace mailboxes (and other information) while on iGoogle. However, to ensure the user's privacy, this only works after the user has authorized AOL or MySpace to make their data available to the gadget running on iGoogle. We also previously
announced
that third-party developers can build their own iGoogle gadgets that access the OAuth-enabled APIs for Google applications such as Calendar, Picasa, and Docs. In fact, since both the gadget platform and OAuth technology are open standards, we are working to help other companies who run services similar to iGoogle to enhance them with support for these standards. Once that is in place, these new OAuth-powered gadgets that are available on iGoogle will also work on those other sites, including many of the gadgets that Google offers for its own applications. This provides a platform for some interesting mash-ups. For example, a third-party developer could create a single gadget that uses OAuth to access both Google OAuth-enabled APIs (such as a Gmail user's
address book
) and
MySpace OAuth-enabled APIs
(such as a user's friend list) and display a mashup of the combination.
While the combination of OAuth with gadgets is an exciting new use of the technology, most of the use of OAuth is between websites, such as to enable a user of Google Health to allow a clinical trial matching site to access his or her health profile. I previously mentioned that one privacy control provided by OAuth is that it defines a standard way for users to authorize one website to make their data accessible to another website. In addition, OAuth provides a way to do this without the first site needing to reveal the identity of the user -- it simply provides a different opaque security token to each additional website the user wants to share his or her data with. It would allow a mutual fund, for example, to provide an iGoogle gadget to their customers that would run on iGoogle and show the user the value of his or her mutual fund, but without giving Google any unique information about the user, such as a social security number or account number. In the future, maybe we will even see industries like banks use standards such as OAuth to allow their customers to authorize utility companies to perform direct debit from the user's bank account without that person having to actually share his or her bank account number with the utility vendor.
The OAuth community is continuing to enhance this standard and is very interested in having more companies engaged with its development. The
OAuth.net
website has more details about the current standard, and I maintain a
website
with advanced information about Google's use of OAuth, including work on integrating OAuth with desktop apps, and integrating with federation standards such as OpenID and SAML. If you're interested in engaging with the OAuth community, please get in touch with us.
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