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1. #SAFARI TECHNOLOGY PREVIEW COOKIE PREVENTION UPDATE#
2. #SAFARI TECHNOLOGY PREVIEW COOKIE PREVENTION PATCH#
3. #SAFARI TECHNOLOGY PREVIEW COOKIE PREVENTION UPGRADE#

Update: Discussions between Simo Ahava and the patch author has yielded new information which I was incorrect about:

#SAFARI TECHNOLOGY PREVIEW COOKIE PREVENTION UPGRADE#

However, in a changeset on August 27th, 2020 the feature flag was removed, which effectively means it will automatically be enabled once released and the relevant Safari upgrade is installed by end users. + CNAME cloaking | Third-party CNAME cloaking | Yes + CNAME cloaking | First-party CNAME cloaking | No + CNAME cloaking | Matching CNAME cloaking | No + CNAME cloaking | No CNAME cloaking | No + No CNAME cloaking | Third-party CNAME cloaking | Yes + No CNAME cloaking | First-party CNAME cloaking | No + No CNAME cloaking | No CNAME cloaking | No + First-party host | First-party subdomain | Capped expiry On August 10th 2020, a change was issued to the Safari development channel behind a feature flag which would check for the following conditions and cap the cookies set by the Network call to 7 days in the following scenarios: The cases for capping expiry look like this (and are backed by test cases):

Campaign performance measurement may see decreased look back windows.Optimization platforms may generate a user on the same device in to multiple experiences of a experiment if their reoccurring visits have a long enough gap between them.Analytic platforms may see drop offs in Retention users which are really still there.Analytic platforms may see surges of ‘New’ users which are really retention.The business impact, should this go live, is the things those solutions depend on may have different behavior.

#SAFARI TECHNOLOGY PREVIEW COOKIE PREVENTION UPDATE#

Should this update make it to stable channel (and I fully expect it will) those solutions will cease working as intended as soon as the remote (destination) domain is identified by the device to have tracking capability as determined by the on device machine learning model. However the valid reasons may be caught in the cross fire to prevent cross site tracking, as is typically the case with Intelligent Tracking Prevention updates. Vendors of all sizes use this tactic for both valid reasons, as well as tracking reasons. Not that they are the only ones affected. In my personal tests this was shown to affect notable systems such as Adobe’s Enterprise Cloud ID. What will this affect?Īny domain which Safari identifies as a tracker may have the cookie expiry reduced even if shielded by a CNAME record so that it appears as 1st party. Īnd so, with this being what I can only assume is being seen as a violation of their policy as the user is not given choice to allow the 3rd party (which can’t see in the Network calls) to track them, they intend to limit the damage such a system can do. These restrictions may apply universally to algorithmically classified targets or to specific parties engaging in circumvention. If a party attempts to circumvent our tracking prevention methods, we may add additional restrictions without prior notice. We treat circumvention of shipping anti-tracking measures with the same seriousness as exploitation of security vulnerabilities.

As they state on their tracking prevention policy: Safari is also clear how they feel about policy circumvention.

This can have major impacts to the security of a website, which Simo Ahava goes into detail on in this blog post. However, since the roll out of Intelligent Tracking Prevention blocking 3rd party cookies, a number of tracking and measurement companies have issued guidance for their customers to instead issue what is known as a CNAME record in order to allow the 3rd party vendor to ‘hide’ behind a 1st party URL, and set cookies without being subject to Intelligent Tracking Prevention client side restrictions. Which is a legitimate thing to be doing with Domain Name Service rules. Which means that for some reason (which may include tracking) a top level domain () has a dedicated DNS entry pointing to a different site so for example: points to …… Third-party CNAME cloaking means a first-party subdomain resolves to a third-party domain which does not match the resolution for the top frame host. Per the bug ticket CNAME Cloaking is defined as:ģrd-party CNAME cloaking is used as a way to circumvent ITP’s 7-day expiry cap on client-side cookies. Today I finally had the time to sit down with the recent Safari Technology preview and do some testing against the previously mentioned issue of CNAME Cloaking Mitigation.