Advisory Details

December 3rd, 2020

Apple macOS AudioToolboxCore Wave Header Parsing Sign Extension Remote Code Execution Vulnerability

ZDI-20-1391
ZDI-CAN-11189

CVE ID CVE-2020-9889
CVSS SCORE 7.8, (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Apple
AFFECTED PRODUCTS macOS
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Apple macOS. Interaction with the AudioToolbox library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.

The specific flaw exists within the AudioToolbox framework. Crafted data in a WAV file can trigger a sign extension before allocating a buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS Apple has issued an update to correct this vulnerability. More details can be found at:
https://support.apple.com/en-us/HT211289
DISCLOSURE TIMELINE
  • 2020-07-01 - Vulnerability reported to vendor
  • 2020-12-03 - Coordinated public release of advisory
CREDIT Anonymous
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