Advisory Details

May 18th, 2017

(Pwn2Own) Apple macOS WindowServer XSetWindowListBrightness Out-Of-Bounds Access Privilege Escalation Vulnerability

ZDI-17-355
ZDI-CAN-4624

CVE ID CVE-2017-2548
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/HT207797
DISCLOSURE TIMELINE
  • 2017-03-17 - Vulnerability reported to vendor
  • 2017-05-18 - Coordinated public release of advisory
CREDIT Team Sniper (Keen Team and PC Manager)
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