Apple OS X AppleUpstreamUserClient Out-Of-Bounds Access Privilege Escalation Vulnerability

ID ZDI-16-520
Type zdi
Reporter Jack Tang of Trend Micro (@jacktang310) Moony Li of Trend Micro
Modified 2016-11-09T00:00:00


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 the AppleUpstreamUserClient kernel extension. The issue lies in the failure to validate the size of a buffer prior to accessing it. An attacker can leverage this vulnerability to execute code within the context of the kernel.