Advisory Details

May 26th, 2016

(Pwn2Own) Apple OS X WindowServer Use-After-Free Privilege Escalation Vulnerability

CVE ID	CVE-2016-1804
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 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.
ADDITIONAL DETAILS	Apple has issued an update to correct this vulnerability. More details can be found at: https://support.apple.com/en-us/HT206567
DISCLOSURE TIMELINE	2016-03-16 - Vulnerability reported to vendor 2016-05-26 - Coordinated public release of advisory
CREDIT	Liang Chen Yubin Fu Marco Grassi of KeenLab Tencent

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