Advisory Details

October 30th, 2018

Apple macOS WindowServer XRegisterForKey Out-Of-Bounds Write Privilege Escalation Vulnerability

CVE ID	CVE-2018-4193
CVSS SCORE	4.4, AV:L/AC:M/Au:N/C:P/I:P/A:P
AFFECTED VENDORS	Apple
AFFECTED PRODUCTS	macOS
VULNERABILITY DETAILS	This vulnerability allows local attackers to escalate privileges on vulnerable installations of Apple macOS. 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 WindowServer process. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated buffer. An attacker can leverage this vulnerability to escalate privileges 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/HT208849
DISCLOSURE TIMELINE	2018-02-20 - Vulnerability reported to vendor 2018-10-30 - Coordinated public release of advisory 2018-10-30 - Advisory Updated
CREDIT	Richard Zhu (fluorescence)

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