Is 17 days an acceptable TAT here? I know investigation and fixes can be a challenge, but with the severity of this exploit+PayPal being a serious financial service, I kind of would hope for a faster fix. Maybe I'm off base...I really don't know; curious what others think.
How much time would've had to pass (without PayPal doing anything) before the author is ethically obligated to post to HN/media/etc about the hack? I believe publicizing an (unpatched) exploit like this crosses into criminality, but it would be essential to demonstrate some kind of proof, for credence and gravity. I'm guessing the community has some standardized guidelines for this sort of thing, but I'm not aware of them.