Advisory Details

May 15th, 2017

(Pwn2Own) Apple macOS WindowServer _XGetConnectionPSN Information Disclosure Vulnerability

ZDI-17-348
ZDI-CAN-4599

CVE ID CVE-2017-2540
CVSS SCORE 1.9, AV:L/AC:M/Au:N/C:P/I:N/A:N
AFFECTED VENDORS Apple
AFFECTED PRODUCTS macOS
VULNERABILITY DETAILS


This vulnerability allows local attackers to disclose sensitive information 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 initialization of memory prior to accessing it. An attacker can leverage this in conjunction with other vulnerabilities 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
  • 2017-03-15 - Vulnerability reported to vendor
  • 2017-05-15 - Coordinated public release of advisory
CREDIT Richard Zhu (fluorescence)
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