The source code for Apple iOS iOS iBoot secure bootloader has been leaked to GitHub. The leaked code is related to iOS 9, but experts believe it could still be present in the latest iOS 11. The data leak is considered very dangerous because hackers and security experts can analyze the code searching for security vulnerabilities. Compromising the iBoot could theoretically allow loading malicious code in the boot phase or a tainted kernel. Apple tried to downplay the issue saying that it implements a layered model of security.”]
Source: http://securityaffairs.co/wordpress/68853/hacking/apple-iboot-data-leak.html