Slashdot Mirror
Microsoft Accuses Google of Violating Internet Explorer's Privacy Settings
New submitter Dupple writes with a followup to Friday's news that Google was bypassing Safari's privacy settings. Now, Microsoft's Internet Explorer blog has a post accusing Google of doing the same thing (in a different way) to Internet Explorer. Quoting:
"By default, IE blocks third-party cookies unless the site presents a P3P Compact Policy Statement indicating how the site will use the cookie and that the site’s use does not include tracking the user. Google’s P3P policy causes Internet Explorer to accept Google’s cookies even though the policy does not state Google’s intent. P3P, an official recommendation of the W3C Web standards body, is a Web technology that all browsers and sites can support. Sites use P3P to describe how they intend to use cookies and user information. By supporting P3P, browsers can block or allow cookies to honor user privacy preferences with respect to the site’s stated intentions. ... Technically, Google utilizes a nuance in the P3P specification that has the effect of bypassing user preferences about cookies. The P3P specification (in an attempt to leave room for future advances in privacy policies) states that browsers should ignore any undefined policies they encounter. Google sends a P3P policy that fails to inform the browser about Google’s use of cookies and user information. Google’s P3P policy is actually a statement that it is not a P3P policy."
In other words, if your server delivers a garbage or blank P3P header, the browser assumes there are no privacy implications? Sounds like a hole in the standard to me, such headers should be ignored IMO. Though Google really should have tested this properly with all browsers before deploying it in production it sounds to me like an oopsie, not at all like the Safari thing.
When I was configuring P3P for Mozilla/Firefox, it distinguished between what exactly the P3P policy was stating. If the site didn't say in the P3P policy what it was doing with cookies, Firefox assumed the worst. It seems to me that if the IE devs were dumb enough to stop after seeing a P3P policy presented and didn't bother checking what it said, or if they assumed a lack of a statement indicated respect for privacy, that's a failure in IE. The code needs to start out assuming personal information is collected and used without consent, and then upgrade only if the P3P header specifically says something better. It's not like that's hard to implement.
Then again, we've seen similar problems in Microsoft software time and time again: they assume the best (input's valid, doesn't contain special characters, etc.) until they detect otherwise, even though best practices say to do the opposite (assume input's invalid until analyzed and proven correct, list the known non-special characters and filter out or escape everything not in that list).
In IE iframes will block cookies if you don't have the right P3P policy. There where other bugs that would prevent your site's cookies from being read.
I've "faked" a P3P header just so users of certain IE browser versions could use my site.
At the end of the day the standard is a proposal and only MS thinks it's worth a hill of beans.
Remember DoubleClick? The sleazy advertising company that everyone loved to hate? Remember when they merged with Abacus Direct, creating a merged company that would mine and combine everything from web cookies to physical addresses, names and phone numbers? Remember when this privacy issue was such an obvious risk that the FTC launched investigations into it? Or when they were widely categorized as malware purveyors, or when they were caught serving drive-by malware infections?
Remember when they merged with a search company, changed their name to Google and kept doing all the same things?
No? Thought not.