Advisory Details

December 10th, 2018

Apple macOS shm Uninitialized Data Information Disclosure Vulnerability

ZDI-18-1365
ZDI-CAN-7299

CVE ID CVE-2018-4435
CVSS SCORE 5.5, AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
AFFECTED VENDORS Apple
AFFECTED PRODUCTS OS X
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 handling of the shared memory module (shm). 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 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/HT209341
DISCLOSURE TIMELINE
  • 2018-09-25 - Vulnerability reported to vendor
  • 2018-12-10 - Coordinated public release of advisory
CREDIT Juwei Lin(@panicaII) and Junzhi Lu of TrendMicro Mobile Security Team
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