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This month, Project Zero revised its Disclosure Policy so that it will publicly reveal details of a security flaw precisely 90 days after privately disclosing the details to the relevant vendor. This is a change from the previous policy under which bugs were revealed after 90 days or when fixed, whichever came first.

As a result of the amended policy, vulnerability details will remain undisclosed for a longer period of time, giving developers enough time to fix their code, and netizens to test and install the patches, before Googlers make technical details and proof-of-concept exploits public for all to see. Project Zero will, we note, reveal vulnerability details sooner if there's mutual agreement between the affected vendor and the web goliath's team. There are also other exceptions: vendors can request an additional 14-day grace period if a vulnerability will be fixed after the 90-day deadline but before 104 days have elapsed. And a seven-day deadline still applies for vulnerabilities being actively exploited in the wild.
imagine this scenario: Project Zero privately informs you that your application has a security hole in it. You spend the next two weeks fixing and testing a resolution for the flaw, and then roll out a suitable patch to your users. Folks now have the best part of 90 days to install this update and be safe before Google goes public with full details of your programming blunder. If the patch breaks during these 90 days, you still have time to address it before the Silicon Valley monster lifts the veil.

Under the old approach, Project Zero would privately tell you that your app has a security hole in it. You then spend the next two weeks fixing and testing the update, and roll out the patch to your users. Googlers immediately spot this, and make their bug report public. Your users are now in a race to update their systems before the hole is abused by miscreants using the web giant's exploit. If your patch doesn't fully work, your users are now left completely vulnerable while hackers play merry havoc with your busted code as you scramble to emit a followup update.

In either case, of course, you're racing against malware developers who are poring over your security patch, as soon as it is released, to find a way to attack unpatched users – though bear in mind, when Google goes public, it typically posts proof-of-concept exploit code, taking care of most of that effort for miscreants.