There was a hacking competition held in Tokyo where hacker teams from around the word were encouraged to attempt to hack into wifi-connected mobile devices, such as the iPhone X, Samsung Galaxy s9, and Xiaomi Mi6. Every single device was hacked by at least one of the teams. For the iPhone X, a team was able to gain access to the phone through a Just in Time (JIT) attack, and ended up stealing a recently deleted photo on the phone. For the Samsung, a team exploited a memory heap overflow vulnerability. Many exploitations that I’ve read about involve exploiting the heap part of memory and either causing an overflow or a seg fault. Competitions like this are a great way for companies to gain awareness about the kinds of vulnerabilities faced by their devices.
https://thehackernews.com/2018/11/mobile-hacking-exploits.html
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