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Apple Reportedly Aware of iCloud Flaw Six Months Before Hacking of Celebrity Accounts
In an email from March 2014, Balic told Apple that he was able to bypass the security of any iCloud account by using a "brute-force" hacking method that was able to try over 20,000 password combinations. Balic recommended to Apple that it should implement a feature in iCloud that prevents log-ins after a set number of failed attempts, and even reported the exploit through Apple's Bug Reporter. Balic was also the developer said to be behind the extended outage of Apple's Dev Center last year.
In May 2014, Apple emailed Balic and questioned the validity of the exploit, stating that it "would take an extraordinarily long time" to find a valid authentication token to get into an iCloud account using the flaw. Balic states that Apple continued to ask him about the exploit and how it would be utilized.
On September 1, 2014, hackers breached the iCloud accounts of many well-known actresses, downloading and leaking private photos and videos. While it was not initially known what caused the breach, The Next Web linked to a Python script on Github that may have been used for the hacking. The script utilized a brute-force like method which allowed hackers to keep guessing passwords without being locked out.
Apple acknowledged later in the day that it was investigating the breach, ultimately leading to comments from CEO Tim Cook along with new security implementations. Those implementations included automatic emails when iCloud accounts are accessed via web browsers, automatic two-factor authentication for iCloud.com, and mandatory app-specific passwords for third-party apps accessing iCloud.