Advisory Details

July 20th, 2016

Apple OS X WindowServer Memory Corruption Privilege Escalation Vulnerability

ZDI-16-431
ZDI-CAN-3776

CVE ID CVE-2016-4639
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 PKGTransactionWillSwitchSpaces, an attacker can cause a memory corruption 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 e048b7039acc9483d42ca9ef197bd909
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