For Apple's MacBooks, a very serious problem was discovered that puts all users at risk, and somewhat embarrasses the American company. More precisely, the Gatekeeper system, which should prevent the installation of unknown applications, has a vulnerability that is already being exploited to run unsigned code in MacBooks.
Gatekeeper in MacBooks can have the protection system completely removed so that unsigned applications can be installed on computers, regardless of where they come from. The vulnerability is based on the way Gatekeeper was thought to protect MacBooks from external environments connected to computers, or files shared over networks, Gatekeeper considering these locations as safe and avoiding checking them.
A signed application that already exists on the Mac can be used to authorize the installation of unsigned ones from these sources, and the vulnerability is already exploited. An American company knows about this vulnerability and is actively exploiting it at the moment, so all MacBook users are at risk.
"Gatekeeper's functionality can be completely bypassed. In its current implementation, Gatekeeper considers both external drives and network shares as "safe locations." This means that it allows any application contained in those locations to run without checking the code again. He goes on to explain the user can "easily" be tricked into mounting a network share drive, and that anything in that folder can then pass Gatekeeper."
