Advisory Details

December 11th, 2019

Apple macOS fseventsd Uninitialized Buffer Information Disclosure Vulnerability

ZDI-19-1009
ZDI-CAN-8613

CVE ID CVE-2019-8798
CVSS SCORE 6.5, (AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N)
AFFECTED VENDORS Apple
AFFECTED PRODUCTS macOS
VULNERABILITY DETAILS

This vulnerability allows local attackers to disclose sensitive information on affected 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 fseventsd daemon. 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 and execute code in the context of the kernel.

ADDITIONAL DETAILS Apple has issued an update to correct this vulnerability. More details can be found at:
https://support.apple.com/en-us/HT210722
DISCLOSURE TIMELINE
  • 2019-08-07 - Vulnerability reported to vendor
  • 2019-12-11 - Coordinated public release of advisory
CREDIT ABC Research s.r.o.
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