Credit: Keen Security Lab of Tencent
From the advisory:
This vulnerability allows local attackers to execute arbitrary code on vulnerable installations of Apple OS X. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the handling of CFData objects within the WindowServer process. An attacker can cause a CFData object in memory to be reused after it has been freed. An attacker can leverage this vulnerability to execute arbitrary code under the context of the WindowServer.