Apple OS X WindowServer _XFlushRegion Out-Of-Bounds Read Privilege Escalation Vulnerability

July 20th, 2016
ZDI-16-432 ZDI-CAN-3771

CVE ID

CVE-2016-4652

CVSS Score

3.3 AV:L/AC:M/Au:N/C:P/I:N/A:P

Affected Vendors

Apple

Affected Products

OS X

Vulnerability Details


This vulnerability allows local attackers to disclose sensitive information on vulnerable installations of Apple OS X. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the CoreGraphics module. The issue lies in the failure to properly validate user-supplied data which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges in the context of 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

  • 2016-06-14 - Vulnerability reported to vendor
  • 2016-07-20 - Coordinated public release of advisory

Credit

aca055c25829115b84ad07e72a4eff16

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