Advisory Details

July 20th, 2016

Apple OS X WindowServer Type Confusion Privilege Escalation Vulnerability

ZDI-16-433
ZDI-CAN-3768

CVE ID CVE-2016-4641
CVSS SCORE 4.4, AV:L/AC:M/Au:N/C:P/I:P/A:P
AFFECTED VENDORS Apple
AFFECTED PRODUCTS OS X
VULNERABILITY DETAILS


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 CoreGraphics. By interacting with _XSetDictionaryForCurrentSession, an attacker can cause a type confusion condition. An attacker could leverage this vulnerability to execute arbitrary code under the context of the WindowServer.
ADDITIONAL DETAILS Apple has issued an update to correct this vulnerability. More details can be found at:
https://support.apple.com/en-us/HT206903
DISCLOSURE TIMELINE
  • 2016-05-20 - Vulnerability reported to vendor
  • 2016-07-20 - Coordinated public release of advisory
CREDIT aca055c25829115b84ad07e72a4eff16
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