posted by David Adams on Mon 3rd Nov 2014 22:27 UTC
IconEmil Kvarnhammar, a hacker at Swedish security firm Truesec, calls the vulnerability "rootpipe" and has explained how he found it and how you can protect against it. It's a so-called privilege escalation vulnerability, which means that even without a password an attacker could gain the highest level of access on a machine, known as root access. From there, the attacker has full control of the system. It affects the newest OS X release, version 10.10, known as Yosemite. Apple hasn't fixed the flaw yet, he says, so Truesec won't provide details yet of how it works.
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