Ad Exchange-Publisher leaks cookies, evades blocking.

Ad Exchange-Publisher creative settings results in 3rd-party cookie blocking evasion and leaks.

The OpenX Ad Exchange which provides Real-Time Bidding services is cooperating closely with its publishers, as a recent observation shows. The way the domain name system is being used, browser blocking of 3rd-party cookies seems to be bypassed as a side effect.

Unrelated cookies such as Google Analytics, are being sent to 3rd-party sites, like OpenX, due to broad cookie scoping and the setting of DNS aliasing, as the full report states.