January 16, 2015 | By Jacob Hoffman-Andrews

Ad Network Turn Will Suspend Zombie Cookie Program. When Will Verizon?

Advertising network Turn announced today that they will suspend their zombie tracking cookie program. Turn was recently caught using Verizon Wireless' invasive UIDH header to undelete tracking cookies that web visitors had previously deleted. This unacceptable practice means that users who delete cookies to avoid Turn's and others' tracking will continue to be tracked against their will, using information associated with their previous activity through a permanent identity.

Take Action This is a step toward victory for everyone who spoke out against Turn's zombie cookies, but it is not enough. Turn's cookies just underscore the huge privacy problems with Verizon's header injection. Turn's cookies were the first example found, but Verizon enables any company to use the identifier in similarly abusive ways, some of which may not be visible to users.

Verizon needs to follow Turn's lead, and end their UIDH header injection program immediately.

Turn plans to "suspend" the zombie cookie program "pending re-evaluation." We again call on Turn to end their zombie cookie program permanently, and to commit not to use headers, browser fingerprinting, or any other method to circumvent individuals' decision to delete cookies. Additionally, Turn says, "By early February, Turn will not 'respawn' cookie IDs associated with the Verizon UIDH." Turn should treat this as the urgent privacy problem that it is, and end the cookie respawning today, not three weeks from now.

Companies that engage in cookie syncing with Turn, as EFF described recently, should immediately disable the Turn cookie syncing program and delete existing cookie syncing data until Turn has confirmed that they have stopped respawning cookies and have purged any cookies that they may have respawned.


Deeplinks Topics

Stay in Touch

NSA Spying

EFF is leading the fight against the NSA's illegal mass surveillance program. Learn more about what the program is, how it works, and what you can do.

Follow EFF

Join @the_zeroth_law, @doctorow, @dane, and David Segal for an AMA on the FCC's privacy rules, Monday at 9am PDT. https://www.reddit.com/r/IAmA...

Mar 25 @ 6:31pm

EFF brings lessons from its comprehensive Surveillance Self-Defense guide to the San Francisco Public Library. https://www.eff.org/deeplinks...

Mar 25 @ 1:26pm

Pls plan to call your House Rep Monday, "vote no FCC privacy repeal" If your rep is Republican, ask 5 friends too https://eff.org/gopp

Mar 24 @ 4:18pm
JavaScript license information