Most of the data leakage of iPhone users, as a rule, was due to hacking of the iCloud account, from where hackers "got" backup copies of victim devices and received all the necessary information. And if you believe the experts, with the release of iOS 11, the cracking of backup copies of iOS devices became even easier.
The blog of the Russian company Elcomsoft, which specializes in information security, has information that Apple has made iOS 11 less secure. As the author of the article writes, if an attacker has a victim device and he will know her password, he can easily create a backup copy of the stolen iPhone on his computer. After that, he will only have to pull out the backup data, including photos and saved passwords in the "Keychain". It does not even help setting a password for backups.
If in previous versions of iOS, when creating a backup, the user could generate a password that was subsequently used by default to create all the backups (even on a new computer), then in iOS 11 the algorithm works somewhat differently. Now it is enough to reset iPhone settings to reset the password for backups. Despite the fact that it will not affect the old backups, you can create new ones without a password.
Of course, this can not be called a serious vulnerability, because in order to do it all, it is necessary to know the password of the victim's iPhone, in addition to seize the device for a long time. Nevertheless, one security barrier in iOS 11 is less.