WeChat worm could pwn a friend before they even answered the call

Tencent has patched up a zero-click vulnerability that security researchers used to create a worm capable of spreading through calls on WeChat. With more than 1.4 billion monthly active users, WeChat is among the most popular apps in the world. According to researchers at Calif, its VoIP stack contained a memory corruption bug that could enable a trusted contact to take control of a user's account simply by calling them.