Apple has released an OS X system update for Yosemite users, bringing the version up to 10.10.5. While the update addresses a number of small bugs, its primary focus is fixing the recently discussed DYLD privilege escalation security exploit. The vulnerability has the potential to allow malware to get root access to a Mac, which is why concerns were raised last week that Apple may not be issuing a fix until the release of OS X 10.11 El Capitan. Fortunately the company has followed through on its promise, releasing the patch right away.
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https://www.slashgear.com/apples-os-x-10-10-5-update-patches-dyld-security-vulnerability-14397130/